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Author SHA1 Message Date
9b2d0b58d7 Create branches/filesystem-v3 for v2 removal
[SVN r77385]
2012-03-18 20:54:17 +00:00
185 changed files with 6381 additions and 9505 deletions

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# Copyright 2021-2025 Andrey Semashev
#
# Distributed under the Boost Software License, Version 1.0.
# (See accompanying file LICENSE_1_0.txt or copy at http://boost.org/LICENSE_1_0.txt)
name: CI
on:
pull_request:
push:
branches:
- master
- develop
- feature/**
concurrency:
group: ${{format('{0}:{1}', github.repository, github.ref)}}
cancel-in-progress: true
env:
GIT_FETCH_JOBS: 8
NET_RETRY_COUNT: 5
DEFAULT_BUILD_VARIANT: debug,release
jobs:
posix:
defaults:
run:
shell: bash
strategy:
fail-fast: false
matrix:
include:
# Linux, gcc
- toolset: gcc-5
cxxstd: "11,14,1z"
os: ubuntu-latest
container: ubuntu:16.04
install:
- g++-5
- toolset: gcc-6
cxxstd: "11,14,1z"
os: ubuntu-latest
container: ubuntu:18.04
install:
- g++-6
- toolset: gcc-7
cxxstd: "11,14,17"
os: ubuntu-latest
container: ubuntu:18.04
install:
- g++-7
- toolset: gcc-8
cxxstd: "11,14,17,2a"
os: ubuntu-latest
container: ubuntu:18.04
install:
- g++-8
- toolset: gcc-9
cxxstd: "11,14,17,2a"
os: ubuntu-latest
container: ubuntu:20.04
install:
- g++-9
- toolset: gcc-10
cxxstd: "11,14,17,20"
os: ubuntu-latest
container: ubuntu:20.04
install:
- g++-10
- toolset: gcc-11
cxxstd: "11,14,17,20,23"
os: ubuntu-22.04
install:
- g++-11
- toolset: gcc-12
cxxstd: "11,14,17,20,23"
os: ubuntu-22.04
install:
- g++-12
- toolset: gcc-13
cxxstd: "11,14,17,20,23"
os: ubuntu-24.04
install:
- g++-13
- toolset: gcc-14
cxxstd: "11,14,17,20,23,26"
os: ubuntu-24.04
install:
- g++-14
- toolset: gcc-15
cxxstd: "11,14,17,20,23,26"
os: ubuntu-latest
container: ubuntu:25.04
install:
- g++-15
- name: UBSAN
toolset: gcc-13
cxxstd: "11,14,17,20,23"
ubsan: 1
build_variant: debug
os: ubuntu-24.04
install:
- g++-13
# Linux, clang
- toolset: clang
compiler: clang++-3.5
cxxstd: "11"
os: ubuntu-latest
container: ubuntu:16.04
install:
- clang-3.5
- toolset: clang
compiler: clang++-3.6
cxxstd: "11,14"
os: ubuntu-latest
container: ubuntu:16.04
install:
- clang-3.6
- toolset: clang
compiler: clang++-3.7
cxxstd: "11,14"
os: ubuntu-latest
container: ubuntu:16.04
install:
- clang-3.7
- toolset: clang
compiler: clang++-3.8
cxxstd: "11,14"
os: ubuntu-latest
container: ubuntu:16.04
install:
- clang-3.8
- toolset: clang
compiler: clang++-3.9
cxxstd: "11,14"
os: ubuntu-latest
container: ubuntu:18.04
install:
- clang-3.9
- toolset: clang
compiler: clang++-4.0
cxxstd: "11,14"
os: ubuntu-latest
container: ubuntu:18.04
install:
- clang-4.0
- toolset: clang
compiler: clang++-5.0
cxxstd: "11,14,1z"
os: ubuntu-latest
container: ubuntu:18.04
install:
- clang-5.0
- toolset: clang
compiler: clang++-6.0
cxxstd: "11,14,17"
os: ubuntu-latest
container: ubuntu:18.04
install:
- clang-6.0
- toolset: clang
compiler: clang++-7
cxxstd: "11,14,17"
os: ubuntu-latest
container: ubuntu:18.04
install:
- clang-7
# Note: clang-8 does not fully support C++20, so it is not compatible with libstdc++-8 in this mode
- toolset: clang
compiler: clang++-8
cxxstd: "11,14,17,2a"
os: ubuntu-latest
container: ubuntu:18.04
install:
- clang-8
- g++-7
gcc_toolchain: 7
- toolset: clang
compiler: clang++-9
cxxstd: "11,14,17,2a"
os: ubuntu-latest
container: ubuntu:20.04
install:
- clang-9
- toolset: clang
compiler: clang++-10
cxxstd: "11,14,17,20"
os: ubuntu-latest
container: ubuntu:20.04
install:
- clang-10
- toolset: clang
compiler: clang++-11
cxxstd: "11,14,17,20"
os: ubuntu-22.04
install:
- clang-11
- g++-11
gcc_toolchain: 11
- toolset: clang
compiler: clang++-12
cxxstd: "11,14,17,20,2b"
os: ubuntu-22.04
install:
- clang-12
- g++-11
gcc_toolchain: 11
- toolset: clang
compiler: clang++-13
cxxstd: "11,14,17,20,2b"
os: ubuntu-22.04
install:
- clang-13
- g++-11
gcc_toolchain: 11
- toolset: clang
compiler: clang++-14
cxxstd: "11,14,17,20,2b"
os: ubuntu-22.04
install:
- clang-14
- g++-11
gcc_toolchain: 11
- toolset: clang
compiler: clang++-15
cxxstd: "11,14,17,20,2b"
os: ubuntu-22.04
install:
- clang-15
- g++-11
gcc_toolchain: 11
- toolset: clang
compiler: clang++-16
cxxstd: "11,14,17,20,2b"
os: ubuntu-24.04
install:
- clang-16
- g++-11
gcc_toolchain: 11
- toolset: clang
compiler: clang++-17
cxxstd: "11,14,17,20,23,26"
os: ubuntu-24.04
install:
- clang-17
- g++-11
gcc_toolchain: 11
- toolset: clang
compiler: clang++-18
cxxstd: "11,14,17,20,23,26"
os: ubuntu-24.04
install:
- clang-18
- g++-13
- toolset: clang
compiler: clang++-19
cxxstd: "11,14,17,20,23,26"
os: ubuntu-24.04
install:
- clang-19
- toolset: clang
compiler: clang++-20
cxxstd: "11,14,17,20,23,26"
os: ubuntu-latest
container: ubuntu:25.04
install:
- clang-20
- toolset: clang
compiler: clang++-20
cxxstd: "11,14,17,20,23,26"
os: ubuntu-latest
container: ubuntu:25.04
install:
- clang-20
- libc++-20-dev
- libc++abi-20-dev
cxxflags: -stdlib=libc++
linkflags: -stdlib=libc++
- name: UBSAN
toolset: clang
compiler: clang++-18
cxxstd: "11,14,17,20,23,26"
cxxflags: -stdlib=libc++
linkflags: "-stdlib=libc++ -lubsan"
ubsan: 1
build_variant: debug
os: ubuntu-24.04
install:
- clang-18
- libc++-18-dev
- libc++abi-18-dev
- toolset: clang
cxxstd: "11,14,17,20,2b"
os: macos-13
- toolset: clang
cxxstd: "11,14,17,20,2b"
os: macos-14
- toolset: clang
cxxstd: "11,14,17,20,2b"
os: macos-15
- name: CMake tests
cmake_tests: 1
os: ubuntu-24.04
timeout-minutes: 20
runs-on: ${{matrix.os}}
container: ${{matrix.container}}
steps:
- name: Setup environment
run: |
if [ -f "/etc/debian_version" ]
then
echo "DEBIAN_FRONTEND=noninteractive" >> $GITHUB_ENV
export DEBIAN_FRONTEND=noninteractive
fi
if [ -n "${{matrix.container}}" ]
then
echo "GHA_CONTAINER=${{matrix.container}}" >> $GITHUB_ENV
if [ -f "/etc/debian_version" ]
then
# Use Azure APT mirrors in containers to avoid HTTP errors due to DDoS filters triggered by lots of CI jobs launching concurrently.
# Note that not all Ubuntu versions support "mirror+file:..." URIs in APT sources, so just use Azure mirrors exclusively.
# Note also that on recent Ubuntu versions DEB822 format is used for source files.
APT_SOURCES=()
if [ -d "/etc/apt/sources.list.d" ]
then
readarray -t APT_SOURCES < <(find "/etc/apt/sources.list.d" -type f -name '*.sources' -print)
fi
if [ -f "/etc/apt/sources.list" ]
then
APT_SOURCES+=("/etc/apt/sources.list")
fi
if [ "${#APT_SOURCES[@]}" -gt 0 ]
then
sed -i -E -e 's!([^ ]+) (http|https)://(archive|security)\.ubuntu\.com/ubuntu[^ ]*(.*)!\1 http://azure.archive.ubuntu.com/ubuntu/\4!' "${APT_SOURCES[@]}"
fi
apt-get -o Acquire::Retries=$NET_RETRY_COUNT update
if [ "$(apt-cache search "^python-is-python3$" | wc -l)" -ne 0 ]
then
PYTHON_PACKAGE="python-is-python3"
else
PYTHON_PACKAGE="python"
fi
apt-get -o Acquire::Retries=$NET_RETRY_COUNT install -y sudo software-properties-common tzdata wget curl apt-transport-https ca-certificates make build-essential g++ $PYTHON_PACKAGE python3 perl git cmake
fi
fi
git config --global pack.threads 0
- name: Install packages
if: matrix.install
run: |
declare -a SOURCE_KEYS SOURCES
if [ -n "${{join(matrix.source_keys, ' ')}}" ]
then
SOURCE_KEYS=("${{join(matrix.source_keys, '" "')}}")
fi
if [ -n "${{join(matrix.sources, ' ')}}" ]
then
SOURCES=("${{join(matrix.sources, '" "')}}")
fi
for key in "${SOURCE_KEYS[@]}"
do
for i in {1..$NET_RETRY_COUNT}
do
echo "Adding key: $key"
wget -O - "$key" | sudo apt-key add - && break || sleep 2
done
done
if [ ${#SOURCES[@]} -gt 0 ]
then
APT_ADD_REPO_COMMON_ARGS=("-y")
APT_ADD_REPO_SUPPORTED_ARGS="$(apt-add-repository --help | perl -ne 'if (/^\s*-n/) { print "n"; } elsif (/^\s*-P/) { print "P"; } elsif (/^\s*-S/) { print "S"; } elsif (/^\s*-U/) { print "U"; }')"
if [ -n "$APT_ADD_REPO_SUPPORTED_ARGS" -a -z "${APT_ADD_REPO_SUPPORTED_ARGS##*n*}" ]
then
APT_ADD_REPO_COMMON_ARGS+=("-n")
fi
APT_ADD_REPO_HAS_SOURCE_ARGS="$([ -n "$APT_ADD_REPO_SUPPORTED_ARGS" -a -z "${APT_ADD_REPO_SUPPORTED_ARGS##*P*}" -a -z "${APT_ADD_REPO_SUPPORTED_ARGS##*S*}" -a -z "${APT_ADD_REPO_SUPPORTED_ARGS##*U*}" ] && echo 1 || echo 0)"
for source in "${SOURCES[@]}"
do
for i in {1..$NET_RETRY_COUNT}
do
APT_ADD_REPO_ARGS=("${APT_ADD_REPO_COMMON_ARGS[@]}")
if [ $APT_ADD_REPO_HAS_SOURCE_ARGS -ne 0 ]
then
case "$source" in
"ppa:"*)
APT_ADD_REPO_ARGS+=("-P")
;;
"deb "*)
APT_ADD_REPO_ARGS+=("-S")
;;
*)
APT_ADD_REPO_ARGS+=("-U")
;;
esac
fi
APT_ADD_REPO_ARGS+=("$source")
echo "apt-add-repository ${APT_ADD_REPO_ARGS[@]}"
sudo -E apt-add-repository "${APT_ADD_REPO_ARGS[@]}" && break || sleep 2
done
done
fi
sudo apt-get -o Acquire::Retries=$NET_RETRY_COUNT update
sudo apt-get -o Acquire::Retries=$NET_RETRY_COUNT install -y ${{join(matrix.install, ' ')}}
- name: Setup GCC Toolchain
if: matrix.gcc_toolchain
run: |
GCC_TOOLCHAIN_ROOT="$HOME/gcc-toolchain"
echo "GCC_TOOLCHAIN_ROOT=\"$GCC_TOOLCHAIN_ROOT\"" >> $GITHUB_ENV
MULTIARCH_TRIPLET="$(dpkg-architecture -qDEB_HOST_MULTIARCH)"
mkdir -p "$GCC_TOOLCHAIN_ROOT"
ln -s /usr/include "$GCC_TOOLCHAIN_ROOT/include"
ln -s /usr/bin "$GCC_TOOLCHAIN_ROOT/bin"
mkdir -p "$GCC_TOOLCHAIN_ROOT/lib/gcc/$MULTIARCH_TRIPLET"
ln -s "/usr/lib/gcc/$MULTIARCH_TRIPLET/${{matrix.gcc_toolchain}}" "$GCC_TOOLCHAIN_ROOT/lib/gcc/$MULTIARCH_TRIPLET/${{matrix.gcc_toolchain}}"
- name: Setup Boost
run: |
echo GITHUB_REPOSITORY: $GITHUB_REPOSITORY
LIBRARY=${GITHUB_REPOSITORY#*/}
echo LIBRARY: $LIBRARY
echo "LIBRARY=$LIBRARY" >> $GITHUB_ENV
echo GITHUB_BASE_REF: $GITHUB_BASE_REF
echo GITHUB_REF: $GITHUB_REF
REF=${GITHUB_BASE_REF:-$GITHUB_REF}
REF=${REF#refs/heads/}
echo REF: $REF
BOOST_BRANCH=develop && [ "$REF" = "master" ] && BOOST_BRANCH=master || true
echo BOOST_BRANCH: $BOOST_BRANCH
BUILD_JOBS=$((nproc || sysctl -n hw.ncpu) 2> /dev/null)
echo "BUILD_JOBS=$BUILD_JOBS" >> $GITHUB_ENV
echo "CMAKE_BUILD_PARALLEL_LEVEL=$BUILD_JOBS" >> $GITHUB_ENV
DEPINST_ARGS=()
GIT_VERSION="$(git --version | sed -e 's/git version //')"
GIT_HAS_JOBS=1
if [ -f "/etc/debian_version" ]
then
if $(dpkg --compare-versions "$GIT_VERSION" lt 2.8.0)
then
GIT_HAS_JOBS=0
fi
else
declare -a GIT_VER=(${GIT_VERSION//./ })
declare -a GIT_MIN_VER=(2 8 0)
for ((i=0; i<${#GIT_VER[@]}; i++))
do
if [ -z "${GIT_MIN_VER[i]}" ]
then
GIT_MIN_VER[i]=0
fi
if [ "${GIT_VER[i]}" -lt "${GIT_MIN_VER[i]}" ]
then
GIT_HAS_JOBS=0
break
fi
done
fi
if [ "$GIT_HAS_JOBS" -ne 0 ]
then
DEPINST_ARGS+=("--git_args" "--jobs $GIT_FETCH_JOBS")
fi
mkdir -p snapshot
cd snapshot
echo "Downloading library snapshot: https://github.com/${GITHUB_REPOSITORY}/archive/${GITHUB_SHA}.tar.gz"
curl -L --retry "$NET_RETRY_COUNT" -o "${LIBRARY}-${GITHUB_SHA}.tar.gz" "https://github.com/${GITHUB_REPOSITORY}/archive/${GITHUB_SHA}.tar.gz"
tar -xf "${LIBRARY}-${GITHUB_SHA}.tar.gz"
if [ ! -d "${LIBRARY}-${GITHUB_SHA}" ]
then
echo "Library snapshot does not contain the library directory ${LIBRARY}-${GITHUB_SHA}:"
ls -la
exit 1
fi
rm -f "${LIBRARY}-${GITHUB_SHA}.tar.gz"
cd ..
git clone -b "$BOOST_BRANCH" --depth 1 "https://github.com/boostorg/boost.git" "boost-root"
cd boost-root
mkdir -p libs
rm -rf "libs/$LIBRARY"
mv -f "../snapshot/${LIBRARY}-${GITHUB_SHA}" "libs/$LIBRARY"
rm -rf "../snapshot"
git submodule update --init tools/boostdep
DEPINST_ARGS+=("$LIBRARY")
python tools/boostdep/depinst/depinst.py "${DEPINST_ARGS[@]}"
if [ -z "${{matrix.cmake_tests}}" ]
then
./bootstrap.sh
./b2 headers
if [ -n "${{matrix.compiler}}" -o -n "$GCC_TOOLCHAIN_ROOT" ]
then
echo -n "using ${{matrix.toolset}} : : ${{matrix.compiler}}" > ~/user-config.jam
if [ -n "$GCC_TOOLCHAIN_ROOT" ]
then
echo -n " : <compileflags>\"--gcc-toolchain=$GCC_TOOLCHAIN_ROOT\" <linkflags>\"--gcc-toolchain=$GCC_TOOLCHAIN_ROOT\"" >> ~/user-config.jam
fi
echo " ;" >> ~/user-config.jam
fi
fi
- name: Run tests
if: matrix.cmake_tests == ''
run: |
cd boost-root
B2_ARGS=("-j" "$BUILD_JOBS" "toolset=${{matrix.toolset}}" "cxxstd=${{matrix.cxxstd}}")
if [ -n "${{matrix.build_variant}}" ]
then
B2_ARGS+=("variant=${{matrix.build_variant}}")
else
B2_ARGS+=("variant=$DEFAULT_BUILD_VARIANT")
fi
if [ -n "${{matrix.threading}}" ]
then
B2_ARGS+=("threading=${{matrix.threading}}")
fi
if [ -n "${{matrix.ubsan}}" ]
then
export UBSAN_OPTIONS="print_stacktrace=1"
B2_ARGS+=("cxxflags=-fsanitize=undefined -fno-sanitize-recover=undefined" "linkflags=-fsanitize=undefined -fuse-ld=gold" "define=UBSAN=1" "debug-symbols=on" "visibility=global")
fi
if [ -n "${{matrix.cxxflags}}" ]
then
B2_ARGS+=("cxxflags=${{matrix.cxxflags}}")
fi
if [ -n "${{matrix.linkflags}}" ]
then
B2_ARGS+=("linkflags=${{matrix.linkflags}}")
fi
B2_ARGS+=("libs/$LIBRARY/test")
./b2 "${B2_ARGS[@]}"
- name: Run CMake tests
if: matrix.cmake_tests
run: |
if [ -n "${{matrix.macosx_version_min}}" ]
then
export MACOSX_DEPLOYMENT_TARGET="${{matrix.macosx_version_min}}"
fi
cd boost-root
mkdir __build_static__ && cd __build_static__
cmake ../libs/$LIBRARY/test/test_cmake
cmake --build . --target boost_${LIBRARY}_cmake_self_test -j $BUILD_JOBS
cd ..
mkdir __build_shared__ && cd __build_shared__
cmake -DBUILD_SHARED_LIBS=On ../libs/$LIBRARY/test/test_cmake
cmake --build . --target boost_${LIBRARY}_cmake_self_test -j $BUILD_JOBS
windows:
defaults:
run:
shell: cmd
strategy:
fail-fast: false
matrix:
include:
- toolset: msvc-14.3
cxxstd: "14,17,20,latest"
addrmd: 32,64
os: windows-2022
- toolset: clang-win
cxxstd: "14,17,latest"
addrmd: 32,64
os: windows-2022
- toolset: gcc
cxxstd: "11,14,17,20,23"
addrmd: 64
os: windows-2022
timeout-minutes: 20
runs-on: ${{matrix.os}}
steps:
- name: Setup Boost
run: |
echo GITHUB_REPOSITORY: %GITHUB_REPOSITORY%
for /f %%i in ("%GITHUB_REPOSITORY%") do set LIBRARY=%%~nxi
echo LIBRARY: %LIBRARY%
echo LIBRARY=%LIBRARY%>>%GITHUB_ENV%
echo GITHUB_BASE_REF: %GITHUB_BASE_REF%
echo GITHUB_REF: %GITHUB_REF%
if "%GITHUB_BASE_REF%" == "" set GITHUB_BASE_REF=%GITHUB_REF%
set BOOST_BRANCH=develop
for /f %%i in ("%GITHUB_BASE_REF%") do if "%%~nxi" == "master" set BOOST_BRANCH=master
echo BOOST_BRANCH: %BOOST_BRANCH%
mkdir snapshot
cd snapshot
echo Downloading library snapshot: https://github.com/%GITHUB_REPOSITORY%/archive/%GITHUB_SHA%.zip
curl -L --retry %NET_RETRY_COUNT% -o "%LIBRARY%-%GITHUB_SHA%.zip" "https://github.com/%GITHUB_REPOSITORY%/archive/%GITHUB_SHA%.zip"
tar -xf "%LIBRARY%-%GITHUB_SHA%.zip"
if not exist "%LIBRARY%-%GITHUB_SHA%\" (
echo Library snapshot does not contain the library directory %LIBRARY%-%GITHUB_SHA%:
dir
exit /b 1
)
del /f "%LIBRARY%-%GITHUB_SHA%.zip"
cd ..
git clone -b %BOOST_BRANCH% --depth 1 https://github.com/boostorg/boost.git boost-root
cd boost-root
if not exist "libs\" mkdir libs
if exist "libs\%LIBRARY%\" rmdir /s /q "libs\%LIBRARY%"
move /Y "..\snapshot\%LIBRARY%-%GITHUB_SHA%" "libs\%LIBRARY%"
rmdir /s /q "..\snapshot"
git submodule update --init tools/boostdep
python tools/boostdep/depinst/depinst.py --git_args "--jobs %GIT_FETCH_JOBS%" %LIBRARY%
cmd /c bootstrap
b2 -d0 headers
- name: Run tests
run: |
cd boost-root
if not "${{matrix.cxxstd}}" == "" set CXXSTD=cxxstd=${{matrix.cxxstd}}
if not "${{matrix.addrmd}}" == "" set ADDRMD=address-model=${{matrix.addrmd}}
if not "${{matrix.build_variant}}" == "" (set BUILD_VARIANT=variant=${{matrix.build_variant}}) else (set BUILD_VARIANT=variant=%DEFAULT_BUILD_VARIANT%)
b2 -j %NUMBER_OF_PROCESSORS% libs/%LIBRARY%/test toolset=${{matrix.toolset}} %CXXSTD% %ADDRMD% %BUILD_VARIANT% embed-manifest-via=linker

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@ -1,27 +0,0 @@
# Copyright 2018 Peter Dimov
# Copyright 2018 Andrey Semashev
# Distributed under the Boost Software License, Version 1.0.
# See accompanying file LICENSE_1_0.txt or copy at https://www.boost.org/LICENSE_1_0.txt
cmake_minimum_required(VERSION 3.5...3.20)
project(boost_iterator VERSION "${BOOST_SUPERPROJECT_VERSION}" LANGUAGES CXX)
add_library(boost_iterator INTERFACE)
add_library(Boost::iterator ALIAS boost_iterator)
target_include_directories(boost_iterator INTERFACE include)
target_link_libraries(boost_iterator
INTERFACE
Boost::assert
Boost::concept_check
Boost::config
Boost::core
Boost::detail
Boost::fusion
Boost::mpl
Boost::optional
Boost::type_traits
Boost::utility
)

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@ -1,27 +0,0 @@
# Boost.Iterator
Boost.Iterator, part of collection of the [Boost C++ Libraries](https://github.com/boostorg), provides tools for building and working with iterators in C++. The library also provides a number of iterator classes that can be used out of the box.
### Directories
* **doc** - Documentation sources
* **include** - Interface headers of Boost.Iterator
* **test** - Boost.Iterator unit tests
* **example** - Boost.Iterator usage examples
### More information
* [Documentation](https://boost.org/libs/iterator)
* [Report bugs](https://github.com/boostorg/iterator/issues/new). Be sure to mention Boost version, platform and compiler you're using. A small compilable code sample to reproduce the problem is always good as well.
* Submit your patches as [pull requests](https://github.com/boostorg/iterator/compare) against **develop** branch. Note that by submitting patches you agree to license your modifications under the [Boost Software License, Version 1.0](https://www.boost.org/LICENSE_1_0.txt).
### Build status
Branch | GitHub Actions | AppVeyor | Test Matrix | Dependencies |
:-------------: | -------------- | -------- | ----------- | ------------ |
[`master`](https://github.com/boostorg/iterator/tree/master) | [![GitHub Actions](https://github.com/boostorg/iterator/actions/workflows/ci.yml/badge.svg?branch=master)](https://github.com/boostorg/iterator/actions?query=branch%3Amaster) | [![AppVeyor](https://ci.appveyor.com/api/projects/status/ud8ug5aai8vd30hg/branch/master?svg=true)](https://ci.appveyor.com/project/Lastique/iterator/branch/master) | [![Tests](https://img.shields.io/badge/matrix-master-brightgreen.svg)](http://www.boost.org/development/tests/master/developer/iterator.html) | [![Dependencies](https://img.shields.io/badge/deps-master-brightgreen.svg)](https://pdimov.github.io/boostdep-report/master/iterator.html)
[`develop`](https://github.com/boostorg/iterator/tree/develop) | [![GitHub Actions](https://github.com/boostorg/iterator/actions/workflows/ci.yml/badge.svg?branch=develop)](https://github.com/boostorg/iterator/actions?query=branch%3Adevelop) | [![AppVeyor](https://ci.appveyor.com/api/projects/status/ud8ug5aai8vd30hg/branch/develop?svg=true)](https://ci.appveyor.com/project/Lastique/iterator/branch/develop) | [![Tests](https://img.shields.io/badge/matrix-develop-brightgreen.svg)](http://www.boost.org/development/tests/develop/developer/iterator.html) | [![Dependencies](https://img.shields.io/badge/deps-develop-brightgreen.svg)](https://pdimov.github.io/boostdep-report/develop/iterator.html)
### License
Distributed under the [Boost Software License, Version 1.0](https://www.boost.org/LICENSE_1_0.txt).

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@ -1,95 +0,0 @@
# Copyright 2017 Edward Diener
# Copyright 2019 Andrey Semashev
# Distributed under the Boost Software License, Version 1.0.
# (See accompanying file LICENSE_1_0.txt or copy at http://boost.org/LICENSE_1_0.txt)
version: 1.0.{build}-{branch}
shallow_clone: true
branches:
only:
- master
- develop
- /feature\/.*/
environment:
matrix:
- TOOLSET: msvc-14.0
CXXSTD: 14,latest
ADDRMD: 32,64
APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
- TOOLSET: msvc-14.1
CXXSTD: 14,17,latest
ADDRMD: 32,64
APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
- TOOLSET: msvc-14.2
ADDRMD: 32,64
CXXSTD: 14,17,20,latest
APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2019
- TOOLSET: msvc-14.3
ADDRMD: 32,64
CXXSTD: 14,17,20,latest
APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2022
- TOOLSET: clang-win
ADDRMD: 32,64
CXXSTD: 14,17,latest
APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
- TOOLSET: gcc
CXXSTD: 11,14,1z
ADDPATH: C:\cygwin\bin;
APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
- TOOLSET: gcc
CXXSTD: 11,14,1z
ADDPATH: C:\cygwin64\bin;
APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
- TOOLSET: gcc
CXXSTD: 11,14,1z
ADDPATH: C:\mingw-w64\x86_64-6.3.0-posix-seh-rt_v5-rev1\mingw64\bin;
APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
- TOOLSET: gcc
CXXSTD: 11,14,1z
ADDPATH: C:\mingw-w64\x86_64-7.3.0-posix-seh-rt_v5-rev0\mingw64\bin;
APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
- TEST_CMAKE: 1
APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2019
install:
- set GIT_FETCH_JOBS=8
- set BOOST_BRANCH=develop
- if "%APPVEYOR_REPO_BRANCH%" == "master" set BOOST_BRANCH=master
- cd ..
- git clone -b %BOOST_BRANCH% --depth 1 https://github.com/boostorg/boost.git boost-root
- cd boost-root
- git submodule init tools/build
- git submodule init tools/boostdep
- git submodule init tools/boost_install
- git submodule init libs/headers
- git submodule init libs/config
- git submodule update --jobs %GIT_FETCH_JOBS%
- xcopy /s /e /q %APPVEYOR_BUILD_FOLDER% libs\iterator
- python tools/boostdep/depinst/depinst.py --git_args "--jobs %GIT_FETCH_JOBS%" iterator
- cmd /c bootstrap
- b2 -d0 headers
build: off
test_script:
- PATH=%ADDPATH%%PATH%
- if not "%CXXSTD%" == "" set CXXSTD=cxxstd=%CXXSTD%
- if not "%ADDRMD%" == "" set ADDRMD=address-model=%ADDRMD%
- b2 -j %NUMBER_OF_PROCESSORS% libs/iterator/test toolset=%TOOLSET% %CXXSTD% %ADDRMD%
for:
- matrix:
only: [TEST_CMAKE: 1]
test_script:
- mkdir __build_static__
- cd __build_static__
- cmake ../libs/iterator/test/test_cmake
- cmake --build . --target boost_iterator_cmake_self_test -j %NUMBER_OF_PROCESSORS%
- cd ..
- mkdir __build_shared__
- cd __build_shared__
- cmake -DBUILD_SHARED_LIBS=On ../libs/iterator/test/test_cmake
- cmake --build . --target boost_iterator_cmake_self_test -j %NUMBER_OF_PROCESSORS%

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@ -1,32 +0,0 @@
# Copyright René Ferdinand Rivera Morell 2023-2024
# Distributed under the Boost Software License, Version 1.0.
# (See accompanying file LICENSE_1_0.txt or copy at
# http://www.boost.org/LICENSE_1_0.txt)
require-b2 5.2 ;
constant boost_dependencies :
/boost/assert//boost_assert
/boost/concept_check//boost_concept_check
/boost/config//boost_config
/boost/core//boost_core
/boost/detail//boost_detail
/boost/fusion//boost_fusion
/boost/mpl//boost_mpl
/boost/optional//boost_optional
/boost/type_traits//boost_type_traits
/boost/utility//boost_utility ;
project /boost/iterator
: common-requirements
<include>include
;
explicit
[ alias boost_iterator : : : : <library>$(boost_dependencies) ]
[ alias all : boost_iterator test ]
;
call-if : boost-library iterator
;

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@ -4,24 +4,20 @@
using quickbook ; using quickbook ;
xml iterator xml iterator
: :
quickbook/iterator.qbk quickbook/iterator.qbk
; ;
boostbook standalone boostbook standalone
: :
iterator iterator
: :
<xsl:param>"boost.root=../../../.." <xsl:param>boost.root=../../../..
<xsl:param>toc.max.depth=3 <xsl:param>toc.max.depth=3
<xsl:param>toc.section.depth=3 <xsl:param>toc.section.depth=3
<xsl:param>chunk.section.depth=2 <xsl:param>chunk.section.depth=4
<format>pdf:<xsl:param>"boost.url.prefix=http://www.boost.org/doc/libs/release/libs/iterator/doc/html" <format>pdf:<xsl:param>boost.url.prefix=http://www.boost.org/doc/libs/release/libs/iterator/doc
; ;
###############################################################################
alias boostdoc ;
explicit boostdoc ;
alias boostrelease : standalone ;
explicit boostrelease ;

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@ -1,75 +0,0 @@
.. Copyright (C) 2017 Michel Morin.
Distributed under the Boost Software License, Version 1.0.
(See accompanying file LICENSE_1_0.txt or copy at
http://www.boost.org/LICENSE_1_0.txt)
=======
advance
=======
``boost::iterators::advance`` is an adapted version of ``std::advance`` for
the Boost iterator traversal concepts.
Header
------
``<boost/iterator/advance.hpp>``
Synopsis
--------
::
template <typename Iterator, typename Distance>
constexpr void advance(Iterator& it, Distance n);
Description
-----------
Moves ``it`` forward by ``n`` increments
(or backward by ``|n|`` decrements if ``n`` is negative).
Requirements
------------
``Iterator`` should model Incrementable Iterator.
Preconditions
-------------
Let ``it``\ :sub:`i` be the iterator obtained by incrementing
(or decrementing if ``n`` is negative) ``it`` by *i*. All the iterators
``it``\ :sub:`i` for *i* = 0, 1, 2, ..., ``|n|`` should be valid.
If ``Iterator`` does not model Bidirectional Traversal Iterator,
``n`` should be non-negative.
Complexity
----------
If ``Iterator`` models Random Access Traversal Iterator, it takes constant time;
otherwise it takes linear time.
Notes
-----
- This function is not a customization point and is protected against
being found by argument-dependent lookup (ADL).
- This function is ``constexpr`` only in C++14 or later.
--------------------------------------------------------------------------------
| Author: Michel Morin
| Copyright |C| 2017 Michel Morin
| Distributed under the `Boost Software License, Version 1.0
<http://www.boost.org/LICENSE_1_0.txt>`_.
.. |C| unicode:: U+00A9 .. COPYRIGHT SIGN

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@ -11,6 +11,7 @@
:organization: `Boost Consulting`_, Indiana University `Open Systems :organization: `Boost Consulting`_, Indiana University `Open Systems
Lab`_, University of Hanover `Institute for Transport Lab`_, University of Hanover `Institute for Transport
Railway Operation and Construction`_ Railway Operation and Construction`_
:date: $Date$
:copyright: Copyright David Abrahams, Jeremy Siek, and Thomas Witt 2003. :copyright: Copyright David Abrahams, Jeremy Siek, and Thomas Witt 2003.
.. _`Boost Consulting`: http://www.boost-consulting.com .. _`Boost Consulting`: http://www.boost-consulting.com

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@ -1,6 +1,8 @@
/* /*
:Author: David Goodger :Author: David Goodger
:Contact: goodger@users.sourceforge.net :Contact: goodger@users.sourceforge.net
:date: $Date$
:version: $Revision$
:copyright: This stylesheet has been placed in the public domain. :copyright: This stylesheet has been placed in the public domain.
boostinspect:nolicense boostinspect:nolicense

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@ -1,72 +0,0 @@
.. Copyright (C) 2017 Michel Morin.
Distributed under the Boost Software License, Version 1.0.
(See accompanying file LICENSE_1_0.txt or copy at
http://www.boost.org/LICENSE_1_0.txt)
========
distance
========
``boost::iterators::distance`` is an adapted version of ``std::distance`` for
the Boost iterator traversal concepts.
Header
------
``<boost/iterator/distance.hpp>``
Synopsis
--------
::
template <typename Iterator>
constexpr typename iterator_difference<Iterator>::type
distance(Iterator first, Iterator last);
Description
-----------
Computes the (signed) distance from ``first`` to ``last``.
Requirements
------------
``Iterator`` should model Single Pass Iterator.
Preconditions
-------------
If ``Iterator`` models Random Access Traversal Iterator,
``[first, last)`` or ``[last, first)`` should be valid;
otherwise ``[first, last)`` should be valid.
Complexity
----------
If ``Iterator`` models Random Access Traversal Iterator, it takes constant time;
otherwise it takes linear time.
Notes
-----
- This function is not a customization point and is protected against
being found by argument-dependent lookup (ADL).
- This function is ``constexpr`` only in C++14 or later.
--------------------------------------------------------------------------------
| Author: Michel Morin
| Copyright |C| 2017 Michel Morin
| Distributed under the `Boost Software License, Version 1.0
<http://www.boost.org/LICENSE_1_0.txt>`_.
.. |C| unicode:: U+00A9 .. COPYRIGHT SIGN

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@ -4,6 +4,7 @@
%% %%
%% o author: Alexander Schmolck (a.schmolck@gmx.net) %% o author: Alexander Schmolck (a.schmolck@gmx.net)
%% o created: 2002-07-07 10:50:31+00:40 %% o created: 2002-07-07 10:50:31+00:40
%% o last modified: $Date: 2004/01/29 05:55:26 $
%% o keywords: %% o keywords:
%% o license: %% o license:
%XXX titlesec %XXX titlesec

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@ -26,7 +26,7 @@
Lab</a>, <a class="last reference external" href="http://www.styleadvisor.com">Zephyr Associates, Inc.</a></td></tr> Lab</a>, <a class="last reference external" href="http://www.styleadvisor.com">Zephyr Associates, Inc.</a></td></tr>
<tr><th class="docinfo-name">Date:</th> <tr><th class="docinfo-name">Date:</th>
<td>2006-09-11</td></tr> <td>2006-09-11</td></tr>
<tr class="field"><th class="docinfo-name">Number:</th><td class="field-body">This is a revised version of <a class="reference external" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2003/n1530.html">N1530</a>=03-0113, which was <tr class="field"><th class="docinfo-name">Number:</th><td class="field-body">This is a revised version of <a class="reference external" href="http://anubis.dkuug.dk/jtc1/sc22/wg21/docs/papers/2003/n1530.html">N1530</a>=03-0113, which was
accepted for Technical Report 1 by the C++ standard accepted for Technical Report 1 by the C++ standard
committee's library working group.</td> committee's library working group.</td>
</tr> </tr>
@ -239,29 +239,29 @@ Iterator Concepts.</p>
<div class="section" id="iterator-concepts"> <div class="section" id="iterator-concepts">
<h2><a class="toc-backref" href="#id18">Iterator Concepts</a></h2> <h2><a class="toc-backref" href="#id18">Iterator Concepts</a></h2>
<p>This proposal is formulated in terms of the new <tt class="docutils literal"><span class="pre">iterator</span> <span class="pre">concepts</span></tt> <p>This proposal is formulated in terms of the new <tt class="docutils literal"><span class="pre">iterator</span> <span class="pre">concepts</span></tt>
as proposed in <a class="reference external" href="http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2003/n1550.htm">n1550</a>, since user-defined and especially adapted as proposed in <a class="reference external" href="http://anubis.dkuug.dk/JTC1/SC22/WG21/docs/papers/2003/n1550.html">n1550</a>, since user-defined and especially adapted
iterators suffer from the well known categorization problems that are iterators suffer from the well known categorization problems that are
inherent to the current iterator categories.</p> inherent to the current iterator categories.</p>
<p>This proposal does not strictly depend on proposal <a class="reference external" href="http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2003/n1550.htm">n1550</a>, as there <p>This proposal does not strictly depend on proposal <a class="reference external" href="http://anubis.dkuug.dk/JTC1/SC22/WG21/docs/papers/2003/n1550.html">n1550</a>, as there
is a direct mapping between new and old categories. This proposal is a direct mapping between new and old categories. This proposal
could be reformulated using this mapping if <a class="reference external" href="http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2003/n1550.htm">n1550</a> was not accepted.</p> could be reformulated using this mapping if <a class="reference external" href="http://anubis.dkuug.dk/JTC1/SC22/WG21/docs/papers/2003/n1550.html">n1550</a> was not accepted.</p>
</div> </div>
<div class="section" id="interoperability"> <div class="section" id="interoperability">
<h2><a class="toc-backref" href="#id19">Interoperability</a></h2> <h2><a class="toc-backref" href="#id19">Interoperability</a></h2>
<p>The question of iterator interoperability is poorly addressed in the <p>The question of iterator interoperability is poorly addressed in the
current standard. There are currently two defect reports that are current standard. There are currently two defect reports that are
concerned with interoperability issues.</p> concerned with interoperability issues.</p>
<p>Issue <a class="reference external" href="http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#179">179</a> concerns the fact that mutable container iterator types <p>Issue <a class="reference external" href="http://anubis.dkuug.dk/jtc1/sc22/wg21/docs/lwg-defects.html#179">179</a> concerns the fact that mutable container iterator types
are only required to be convertible to the corresponding constant are only required to be convertible to the corresponding constant
iterator types, but objects of these types are not required to iterator types, but objects of these types are not required to
interoperate in comparison or subtraction expressions. This situation interoperate in comparison or subtraction expressions. This situation
is tedious in practice and out of line with the way built in types is tedious in practice and out of line with the way built in types
work. This proposal implements the proposed resolution to issue work. This proposal implements the proposed resolution to issue
<a class="reference external" href="http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#179">179</a>, as most standard library implementations do nowadays. In other <a class="reference external" href="http://anubis.dkuug.dk/jtc1/sc22/wg21/docs/lwg-defects.html#179">179</a>, as most standard library implementations do nowadays. In other
words, if an iterator type A has an implicit or user defined words, if an iterator type A has an implicit or user defined
conversion to an iterator type B, the iterator types are interoperable conversion to an iterator type B, the iterator types are interoperable
and the usual set of operators are available.</p> and the usual set of operators are available.</p>
<p>Issue <a class="reference external" href="http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-active.html#280">280</a> concerns the current lack of interoperability between <p>Issue <a class="reference external" href="http://anubis.dkuug.dk/jtc1/sc22/wg21/docs/lwg-active.html#280">280</a> concerns the current lack of interoperability between
reverse iterator types. The proposed new reverse_iterator template reverse iterator types. The proposed new reverse_iterator template
fixes the issues raised in 280. It provides the desired fixes the issues raised in 280. It provides the desired
interoperability without introducing unwanted overloads.</p> interoperability without introducing unwanted overloads.</p>
@ -422,8 +422,8 @@ member (e.g. <a class="reference internal" href="#counting"><tt class="docutils
into the temporary iterator <tt class="docutils literal"><span class="pre">p+n</span></tt>, which is destroyed when into the temporary iterator <tt class="docutils literal"><span class="pre">p+n</span></tt>, which is destroyed when
<tt class="docutils literal"><span class="pre">operator[]</span></tt> returns.</p> <tt class="docutils literal"><span class="pre">operator[]</span></tt> returns.</p>
<p>Writable iterators built with <tt class="docutils literal"><span class="pre">iterator_facade</span></tt> implement the <p>Writable iterators built with <tt class="docutils literal"><span class="pre">iterator_facade</span></tt> implement the
semantics required by the preferred resolution to <a class="reference external" href="http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-active.html#299">issue 299</a> and semantics required by the preferred resolution to <a class="reference external" href="http://anubis.dkuug.dk/jtc1/sc22/wg21/docs/lwg-active.html#299">issue 299</a> and
adopted by proposal <a class="reference external" href="http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2003/n1550.htm">n1550</a>: the result of <tt class="docutils literal"><span class="pre">p[n]</span></tt> is an object adopted by proposal <a class="reference external" href="http://anubis.dkuug.dk/JTC1/SC22/WG21/docs/papers/2003/n1550.html">n1550</a>: the result of <tt class="docutils literal"><span class="pre">p[n]</span></tt> is an object
convertible to the iterator's <tt class="docutils literal"><span class="pre">value_type</span></tt>, and <tt class="docutils literal"><span class="pre">p[n]</span> <span class="pre">=</span> <span class="pre">x</span></tt> is convertible to the iterator's <tt class="docutils literal"><span class="pre">value_type</span></tt>, and <tt class="docutils literal"><span class="pre">p[n]</span> <span class="pre">=</span> <span class="pre">x</span></tt> is
equivalent to <tt class="docutils literal"><span class="pre">*(p</span> <span class="pre">+</span> <span class="pre">n)</span> <span class="pre">=</span> <span class="pre">x</span></tt> (Note: This result object may be equivalent to <tt class="docutils literal"><span class="pre">*(p</span> <span class="pre">+</span> <span class="pre">n)</span> <span class="pre">=</span> <span class="pre">x</span></tt> (Note: This result object may be
implemented as a proxy containing a copy of <tt class="docutils literal"><span class="pre">p+n</span></tt>). This approach implemented as a proxy containing a copy of <tt class="docutils literal"><span class="pre">p+n</span></tt>). This approach
@ -2622,7 +2622,7 @@ proxy object.</p>
<div class="section" id="header"> <div class="section" id="header">
<h4><a class="toc-backref" href="#id70">Header</a></h4> <h4><a class="toc-backref" href="#id70">Header</a></h4>
<pre class="literal-block"> <pre class="literal-block">
#include &lt;boost/iterator/function_output_iterator.hpp&gt; #include &lt;boost/function_output_iterator.hpp&gt;
</pre> </pre>
<pre class="literal-block"> <pre class="literal-block">
template &lt;class UnaryFunction&gt; template &lt;class UnaryFunction&gt;

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@ -10,6 +10,7 @@
:Contact: dave@boost-consulting.com, jsiek@osl.iu.edu, witt@styleadvisor.com :Contact: dave@boost-consulting.com, jsiek@osl.iu.edu, witt@styleadvisor.com
:organization: `Boost Consulting`_, Indiana University `Open Systems :organization: `Boost Consulting`_, Indiana University `Open Systems
Lab`_, `Zephyr Associates, Inc.`_ Lab`_, `Zephyr Associates, Inc.`_
:date: $Date$
:Number: This is a revised version of N1530_\ =03-0113, which was :Number: This is a revised version of N1530_\ =03-0113, which was
accepted for Technical Report 1 by the C++ standard accepted for Technical Report 1 by the C++ standard
@ -18,7 +19,7 @@
.. Version 1.9 of this ReStructuredText document corresponds to .. Version 1.9 of this ReStructuredText document corresponds to
n1530_, the paper accepted by the LWG. n1530_, the paper accepted by the LWG.
.. _n1530: http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2003/n1530.html .. _n1530: http://anubis.dkuug.dk/jtc1/sc22/wg21/docs/papers/2003/n1530.html
:copyright: Copyright David Abrahams, Jeremy Siek, and Thomas Witt 2003. :copyright: Copyright David Abrahams, Jeremy Siek, and Thomas Witt 2003.
@ -139,7 +140,7 @@ as proposed in n1550_, since user-defined and especially adapted
iterators suffer from the well known categorization problems that are iterators suffer from the well known categorization problems that are
inherent to the current iterator categories. inherent to the current iterator categories.
.. _n1550: http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2003/n1550.htm .. _n1550: http://anubis.dkuug.dk/JTC1/SC22/WG21/docs/papers/2003/n1550.html
This proposal does not strictly depend on proposal n1550_, as there This proposal does not strictly depend on proposal n1550_, as there
is a direct mapping between new and old categories. This proposal is a direct mapping between new and old categories. This proposal
@ -168,8 +169,8 @@ reverse iterator types. The proposed new reverse_iterator template
fixes the issues raised in 280. It provides the desired fixes the issues raised in 280. It provides the desired
interoperability without introducing unwanted overloads. interoperability without introducing unwanted overloads.
.. _179: http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#179 .. _179: http://anubis.dkuug.dk/jtc1/sc22/wg21/docs/lwg-defects.html#179
.. _280: http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-active.html#280 .. _280: http://anubis.dkuug.dk/jtc1/sc22/wg21/docs/lwg-active.html#280
Iterator Facade Iterator Facade

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@ -11,6 +11,7 @@
:organization: `Boost Consulting`_, Indiana University `Open Systems :organization: `Boost Consulting`_, Indiana University `Open Systems
Lab`_, University of Hanover `Institute for Transport Lab`_, University of Hanover `Institute for Transport
Railway Operation and Construction`_ Railway Operation and Construction`_
:date: $Date$
:copyright: Copyright David Abrahams, Jeremy Siek, and Thomas Witt 2003. :copyright: Copyright David Abrahams, Jeremy Siek, and Thomas Witt 2003.
.. _`Boost Consulting`: http://www.boost-consulting.com .. _`Boost Consulting`: http://www.boost-consulting.com

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@ -7,7 +7,7 @@ Header
:: ::
#include <boost/iterator/function_output_iterator.hpp> #include <boost/function_output_iterator.hpp>
:: ::

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@ -1,13 +1,10 @@
:Author: :Author:
`Dean Michael Berris <mailto:me@deanberris.com>`_ `Dean Michael Berris <mailto:mikhailberis@gmail.com>`_
:License: :License:
Distributed under the Boost Software License, Version 1.0 Distributed under the Boost Software License, Version 1.0
(See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
:Copyright:
Copyright 2012 Google, Inc.
Function Input Iterator Function Input Iterator
======================= =======================
@ -18,14 +15,11 @@ the iterator has been incremented. A Function Input Iterator models the
.. _InputIterator: http://www.sgi.com/tech/stl/InputIterator.html .. _InputIterator: http://www.sgi.com/tech/stl/InputIterator.html
The Function Input Iterator takes a function that models the Generator_ concept Like the Generator Iterator, the Function Input Iterator takes a function
(which is basically a nullary or 0-arity function object). The first dereference that models the Generator_ concept (which is basically a nullary or 0-arity
of the iterator at a given position invokes the generator function and stores function object). Each increment of the function Function Input Iterator
and returns the result; subsequent dereferences at the same position simply invokes the generator function and stores the value in the iterator. When
return the same stored result. Incrementing the iterator places it at a new the iterator is dereferenced the stored value is returned.
position, hence a subsequent dereference will generate a new value via another
invokation of the generator function. This ensures the generator function is
invoked precisely when the iterator is requested to return a (new) value.
.. _Generator: http://www.sgi.com/tech/stl/Generator.html .. _Generator: http://www.sgi.com/tech/stl/Generator.html
@ -64,7 +58,7 @@ Synopsis
template <class Function, class State> template <class Function, class State>
typename function_input_iterator<Function, State> typename function_input_iterator<Function, State>
make_function_input_iterator(Function & f, State s); make_function_input_iterator(Function & f);
struct infinite; struct infinite;
} }
@ -118,7 +112,7 @@ it with the ``boost::infinite`` helper class.
copy( copy(
make_function_input_iterator(f,infinite()), make_function_input_iterator(f,infinite()),
make_function_input_iterator(f,infinite()), make_function_input_iterator(f,infinite()),
ostream_iterator<int>(cout, " ") ostream_iterator<int>(count, " ")
); );
Above, instead of creating a huge vector we rely on the STL copy algorithm Above, instead of creating a huge vector we rely on the STL copy algorithm

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@ -68,7 +68,7 @@ proxy object.</td>
<div class="section" id="header"> <div class="section" id="header">
<h1><a class="toc-backref" href="#id1">Header</a></h1> <h1><a class="toc-backref" href="#id1">Header</a></h1>
<pre class="literal-block"> <pre class="literal-block">
#include &lt;boost/iterator/function_output_iterator.hpp&gt; #include &lt;boost/function_output_iterator.hpp&gt;
</pre> </pre>
<pre class="literal-block"> <pre class="literal-block">
template &lt;class UnaryFunction&gt; template &lt;class UnaryFunction&gt;

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@ -11,6 +11,7 @@
:organization: `Boost Consulting`_, Indiana University `Open Systems :organization: `Boost Consulting`_, Indiana University `Open Systems
Lab`_, University of Hanover `Institute for Transport Lab`_, University of Hanover `Institute for Transport
Railway Operation and Construction`_ Railway Operation and Construction`_
:date: $Date$
:copyright: Copyright David Abrahams, Jeremy Siek, and Thomas Witt 2003. :copyright: Copyright David Abrahams, Jeremy Siek, and Thomas Witt 2003.
.. _`Boost Consulting`: http://www.boost-consulting.com .. _`Boost Consulting`: http://www.boost-consulting.com

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<title>Generator Iterator Adaptor Documentation</title>
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<h1>Generator Iterator Adaptor</h1>
<p>Defined in header <a href=
"../../boost/iterator/generator_iterator.hpp">boost/iterator/generator_iterator.hpp</a></p>
<p>The generator iterator adaptor makes it easier to create custom input
iterators from 0-ary functions and function objects. The adaptor takes a
<a href="http://www.sgi.com/tech/stl/Generator.html">Generator</a> and
creates a model of <a href=
"http://www.sgi.com/tech/stl/InputIterator.html">Input Iterator</a>. Each
increment retrieves an item from the generator and makes it available to be
retrieved by dereferencing. The motivation for this iterator is that some
concepts can be more naturally expressed as a generator, while most STL
algorithms expect an iterator. An example is the <a href=
"../random/index.html">Random Number</a> library.</p>
<h2>Synopsis</h2>
<blockquote>
<pre>
namespace boost {
namespace iterators {
template &lt;class Generator&gt;
class generator_iterator_generator;
template &lt;class Generator&gt;
typename generator_iterator_generator&lt;Generator&gt;::type
make_generator_iterator(Generator &amp; gen);
}
}
</pre>
</blockquote>
<hr>
<h2>The Generator Iterator Generator Class</h2>
<p>The class generator_iterator_generator is a helper class whose purpose
is to construct a generator iterator type. The template parameter for this
class is the Generator function object type that is being wrapped. The
generator iterator adaptor only holds a reference (or pointer) to the
function object, therefore the function object must outlive the generator
iterator adaptor constructed from it.</p>
<pre>
template &lt;class Generator&gt;
class generator_iterator_generator
{
public:
using type = <i>unspecified</i>; // the resulting generator iterator type
};
</pre>
<h3>Template Parameters</h3>
<table border summary="">
<tr>
<th>Parameter</th>
<th>Description</th>
</tr>
<tr>
<td><tt><a href=
"http://www.sgi.com/tech/stl/Generator.html">Generator</a></tt></td>
<td>The generator (0-ary function object) type being wrapped. The
return type of the function is deduced automatically from its
<tt>operator()</tt>. The function object must be a model of
<a href=
"http://www.sgi.com/tech/stl/Generator.html">Generator</a>.</td>
</tr>
</table>
<h3>Concept Model</h3>
<p>The generator iterator class is a model of <a href=
"http://www.sgi.com/tech/stl/InputIterator.html">Input Iterator</a>.</p>
<h3>Members</h3>
<p>The generator iterator implements the member functions and operators
required of the <a href=
"http://www.sgi.com/tech/stl/InputIterator.html">Input Iterator</a>
concept.<br></p>
<hr>
<h2><a name="make_generator_iterator" id="make_generator_iterator">The
Generator Iterator Object Generator</a></h2>
<p>The <tt>make_generator_iterator()</tt> function provides a convenient
way to create generator iterator objects. The function saves the user the
trouble of explicitly writing out the iterator types.</p>
<blockquote>
<pre>
template &lt;class Generator&gt;
typename generator_iterator_generator&lt;Generator&gt;::type
make_generator_iterator(Generator &amp; gen);
</pre>
</blockquote>
<hr>
<h3>Example</h3>
<p>The following program shows how <code>generator_iterator</code>
transforms a generator into an input iterator.</p>
<blockquote>
<pre>
#include &lt;iostream&gt;
#include &lt;boost/iterators/generator_iterator.hpp&gt;
class my_generator
{
public:
using result_type = int;
my_generator() : state(0) { }
result_type operator()() { return ++state; }
private:
int state;
};
int main()
{
my_generator gen;
auto it = boost::iterators::make_generator_iterator(gen);
for(int i = 0; i &lt; 10; ++i, ++it)
std::cout &lt;&lt; *it &lt;&lt; std::endl;
}
</pre>
</blockquote>
<hr>
<p><a href="http://validator.w3.org/check?uri=referer"><img border="0" src=
"../../doc/images/valid-html401.png" alt="Valid HTML 4.01 Transitional"
height="31" width="88"></a></p>
<p>Revised
<!--webbot bot="Timestamp" s-type="EDITED" s-format="%d %B, %Y" startspan -->05 December, 2006<!--webbot bot="Timestamp" endspan i-checksum="38516" --></p>
<p><i>Copyright &copy; 2001 <a href=
"http://www.boost.org/people/jens_maurer.htm">Jens Maurer</a></i></p>
<p><i>Distributed under the Boost Software License, Version 1.0. (See
accompanying file <a href="../../LICENSE_1_0.txt">LICENSE_1_0.txt</a> or
copy at <a href=
"http://www.boost.org/LICENSE_1_0.txt">http://www.boost.org/LICENSE_1_0.txt</a>)</i></p>
</body>
</html>

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@ -26,6 +26,8 @@
<tr class="field"><th class="field-name">organizations:</th><td class="field-body"><a class="reference external" href="http://www.boost-consulting.com">Boost Consulting</a>, Indiana University <a class="reference external" href="http://www.osl.iu.edu">Open Systems <tr class="field"><th class="field-name">organizations:</th><td class="field-body"><a class="reference external" href="http://www.boost-consulting.com">Boost Consulting</a>, Indiana University <a class="reference external" href="http://www.osl.iu.edu">Open Systems
Lab</a>, <a class="reference external" href="http://www.styleadvisor.com">Zephyr Associates, Inc.</a></td> Lab</a>, <a class="reference external" href="http://www.styleadvisor.com">Zephyr Associates, Inc.</a></td>
</tr> </tr>
<tr class="field"><th class="field-name">date:</th><td class="field-body">$Date$</td>
</tr>
<tr class="field"><th class="field-name">copyright:</th><td class="field-body">Copyright David Abrahams, Jeremy Siek, Thomas Witt 2003.</td> <tr class="field"><th class="field-name">copyright:</th><td class="field-body">Copyright David Abrahams, Jeremy Siek, Thomas Witt 2003.</td>
</tr> </tr>
</tbody> </tbody>
@ -129,9 +131,6 @@ is called to get the value to return.</li>
<li><a class="reference external" href="function_output_iterator.html"><tt class="docutils literal"><span class="pre">function_output_iterator</span></tt></a> (<a class="reference external" href="function_output_iterator.pdf">PDF</a>): an output iterator wrapping a unary function <li><a class="reference external" href="function_output_iterator.html"><tt class="docutils literal"><span class="pre">function_output_iterator</span></tt></a> (<a class="reference external" href="function_output_iterator.pdf">PDF</a>): an output iterator wrapping a unary function
object; each time an element is written into the dereferenced object; each time an element is written into the dereferenced
iterator, it is passed as a parameter to the function object.</li> iterator, it is passed as a parameter to the function object.</li>
<li><a class="reference external" href="generator_iterator.htm"><tt class="docutils literal"><span class="pre">generator_iterator</span></tt></a>: an input iterator wrapping a reference to a generator (nullary function object);
each time the iterator is dereferenced, the function object
is called to get the value to return. This is a more outdated analogue of <tt class="docutils literal"><span class="pre">function_input_iterator</span></tt>.</li>
<li><a class="reference external" href="indirect_iterator.html"><tt class="docutils literal"><span class="pre">indirect_iterator</span></tt></a> (<a class="reference external" href="indirect_iterator.pdf">PDF</a>): an iterator over the objects <em>pointed-to</em> by the <li><a class="reference external" href="indirect_iterator.html"><tt class="docutils literal"><span class="pre">indirect_iterator</span></tt></a> (<a class="reference external" href="indirect_iterator.pdf">PDF</a>): an iterator over the objects <em>pointed-to</em> by the
elements of some sequence.</li> elements of some sequence.</li>
<li><a class="reference external" href="permutation_iterator.html"><tt class="docutils literal"><span class="pre">permutation_iterator</span></tt></a> (<a class="reference external" href="permutation_iterator.pdf">PDF</a>): an iterator over the elements of some random-access <li><a class="reference external" href="permutation_iterator.html"><tt class="docutils literal"><span class="pre">permutation_iterator</span></tt></a> (<a class="reference external" href="permutation_iterator.pdf">PDF</a>): an iterator over the elements of some random-access
@ -140,7 +139,7 @@ sequence, rearranged according to some sequence of integer indices.</li>
bidirectional sequence in reverse. Corrects many of the bidirectional sequence in reverse. Corrects many of the
shortcomings of C++98's <tt class="docutils literal"><span class="pre">std::reverse_iterator</span></tt>.</li> shortcomings of C++98's <tt class="docutils literal"><span class="pre">std::reverse_iterator</span></tt>.</li>
<li><a class="reference external" href="../../utility/shared_container_iterator.html"><tt class="docutils literal"><span class="pre">shared_container_iterator</span></tt></a>: an iterator over elements of a container whose <li><a class="reference external" href="../../utility/shared_container_iterator.html"><tt class="docutils literal"><span class="pre">shared_container_iterator</span></tt></a>: an iterator over elements of a container whose
lifetime is maintained by a <tt class="docutils literal"><span class="pre">shared_ptr</span></tt> stored in the iterator.</li> lifetime is maintained by a <a class="reference external" href="../../smart_ptr/shared_ptr.htm"><tt class="docutils literal"><span class="pre">shared_ptr</span></tt></a> stored in the iterator.</li>
<li><a class="reference external" href="transform_iterator.html"><tt class="docutils literal"><span class="pre">transform_iterator</span></tt></a> (<a class="reference external" href="transform_iterator.pdf">PDF</a>): an iterator over elements which are the result of <li><a class="reference external" href="transform_iterator.html"><tt class="docutils literal"><span class="pre">transform_iterator</span></tt></a> (<a class="reference external" href="transform_iterator.pdf">PDF</a>): an iterator over elements which are the result of
applying some functional transformation to the elements of an applying some functional transformation to the elements of an
underlying sequence. This component also replaces the old underlying sequence. This component also replaces the old

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@ -19,6 +19,7 @@ __ ../../../index.htm
:Contact: dave@boost-consulting.com, jsiek@osl.iu.edu, witt@styleadvisor.com :Contact: dave@boost-consulting.com, jsiek@osl.iu.edu, witt@styleadvisor.com
:organizations: `Boost Consulting`_, Indiana University `Open Systems :organizations: `Boost Consulting`_, Indiana University `Open Systems
Lab`_, `Zephyr Associates, Inc.`_ Lab`_, `Zephyr Associates, Inc.`_
:date: $Date$
:copyright: Copyright David Abrahams, Jeremy Siek, Thomas Witt 2003. :copyright: Copyright David Abrahams, Jeremy Siek, Thomas Witt 2003.
@ -114,8 +115,8 @@ __ iterator_facade.pdf
__ iterator_adaptor.pdf __ iterator_adaptor.pdf
Both |facade| and |adaptor| as well as many of the `specialized Both |facade| and |adaptor| as well as many of the `specialized
adaptors`_ mentioned below have been proposed for standardization; adaptors`_ mentioned below have been proposed for standardization,
see our and accepted into the first C++ technical report; see our
`Standard Proposal For Iterator Facade and Adaptor`__ (PDF__) `Standard Proposal For Iterator Facade and Adaptor`__ (PDF__)
@ -145,10 +146,6 @@ iterator templates based on the Boost `iterator facade and adaptor`_.
object; each time an element is written into the dereferenced object; each time an element is written into the dereferenced
iterator, it is passed as a parameter to the function object. iterator, it is passed as a parameter to the function object.
* |generator|_: an input iterator wrapping a generator (nullary
function object); each time the iterator is dereferenced, the function object
is called to get the value to return. This is an outdated analogue of |function_input|_.
* |indirect|_ (PDF__): an iterator over the objects *pointed-to* by the * |indirect|_ (PDF__): an iterator over the objects *pointed-to* by the
elements of some sequence. elements of some sequence.
@ -186,9 +183,6 @@ __ function_input_iterator.pdf
.. _function_output: function_output_iterator.html .. _function_output: function_output_iterator.html
__ function_output_iterator.pdf __ function_output_iterator.pdf
.. |generator| replace:: ``generator_iterator``
.. _generator: generator_iterator.htm
.. |indirect| replace:: ``indirect_iterator`` .. |indirect| replace:: ``indirect_iterator``
.. _indirect: indirect_iterator.html .. _indirect: indirect_iterator.html
__ indirect_iterator.pdf __ indirect_iterator.pdf
@ -219,23 +213,6 @@ __ zip_iterator.pdf
Iterator Utilities Iterator Utilities
==================== ====================
Operations
----------
The standard library does not handle new-style iterators properly,
because it knows nothing about the iterator traversal concepts.
The Boost.Iterator library provides implementations that fully understand
the new concepts for the two basic operations:
- |advance|_
- |distance|_
.. |advance| replace:: ``advance``
.. _advance: advance.html
.. |distance| replace:: ``distance``
.. _distance: distance.html
Traits Traits
------ ------

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@ -11,6 +11,7 @@
:organization: `Boost Consulting`_, Indiana University `Open Systems :organization: `Boost Consulting`_, Indiana University `Open Systems
Lab`_, University of Hanover `Institute for Transport Lab`_, University of Hanover `Institute for Transport
Railway Operation and Construction`_ Railway Operation and Construction`_
:date: $Date$
:copyright: Copyright David Abrahams, Jeremy Siek, and Thomas Witt 2003. :copyright: Copyright David Abrahams, Jeremy Siek, and Thomas Witt 2003.
.. _`Boost Consulting`: http://www.boost-consulting.com .. _`Boost Consulting`: http://www.boost-consulting.com

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@ -2,6 +2,7 @@
Interoperability Revisited Interoperability Revisited
++++++++++++++++++++++++++++ ++++++++++++++++++++++++++++
:date: $Date$
:copyright: Copyright Thomas Witt 2004. :copyright: Copyright Thomas Witt 2004.
.. Distributed under the Boost .. Distributed under the Boost

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@ -3,11 +3,12 @@
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
.. _N1550: http://www.boost-consulting.com/writing/n1550.html .. _N1550: http://www.boost-consulting.com/writing/n1550.html
.. _N1530: http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2003/n1530.html .. _N1530: http://anubis.dkuug.dk/jtc1/sc22/wg21/docs/papers/2003/n1530.html
:Author: David Abrahams and Jeremy Siek :Author: David Abrahams and Jeremy Siek
:Contact: dave@boost-consulting.com, jsiek@osl.iu.edu :Contact: dave@boost-consulting.com, jsiek@osl.iu.edu
:Organization: `Boost Consulting`_, Indiana University Bloomington :Organization: `Boost Consulting`_, Indiana University Bloomington
:date: $Date$
:Copyright: Copyright David Abrahams, Jeremy Siek 2003. Use, modification and :Copyright: Copyright David Abrahams, Jeremy Siek 2003. Use, modification and
distribution is subject to the Boost Software License, distribution is subject to the Boost Software License,
Version 1.0. (See accompanying file LICENSE_1_0.txt or copy Version 1.0. (See accompanying file LICENSE_1_0.txt or copy

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@ -11,6 +11,7 @@
:organization: `Boost Consulting`_, Indiana University `Open Systems :organization: `Boost Consulting`_, Indiana University `Open Systems
Lab`_, University of Hanover `Institute for Transport Lab`_, University of Hanover `Institute for Transport
Railway Operation and Construction`_ Railway Operation and Construction`_
:date: $Date$
:copyright: Copyright David Abrahams, Jeremy Siek, and Thomas Witt 2003. :copyright: Copyright David Abrahams, Jeremy Siek, and Thomas Witt 2003.
.. _`Boost Consulting`: http://www.boost-consulting.com .. _`Boost Consulting`: http://www.boost-consulting.com

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@ -10,6 +10,7 @@
:Contact: dave@boost-consulting.com, jsiek@osl.iu.edu, witt@styleadvisor.com :Contact: dave@boost-consulting.com, jsiek@osl.iu.edu, witt@styleadvisor.com
:organization: `Boost Consulting`_, Indiana University `Open Systems :organization: `Boost Consulting`_, Indiana University `Open Systems
Lab`_, `Zephyr Associates, Inc.`_ Lab`_, `Zephyr Associates, Inc.`_
:date: $Date$
:copyright: Copyright David Abrahams, Jeremy Siek, and Thomas Witt 2004. :copyright: Copyright David Abrahams, Jeremy Siek, and Thomas Witt 2004.
.. _`Boost Consulting`: http://www.boost-consulting.com .. _`Boost Consulting`: http://www.boost-consulting.com

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@ -10,6 +10,7 @@
:Contact: dave@boost-consulting.com, jsiek@osl.iu.edu, witt@styleadvisor.com :Contact: dave@boost-consulting.com, jsiek@osl.iu.edu, witt@styleadvisor.com
:organization: `Boost Consulting`_, Indiana University `Open Systems :organization: `Boost Consulting`_, Indiana University `Open Systems
Lab`_, `Zephyr Associates, Inc.`_ Lab`_, `Zephyr Associates, Inc.`_
:date: $Date$
:copyright: Copyright David Abrahams, Jeremy Siek, and Thomas Witt 2004. :copyright: Copyright David Abrahams, Jeremy Siek, and Thomas Witt 2004.
.. _`Boost Consulting`: http://www.boost-consulting.com .. _`Boost Consulting`: http://www.boost-consulting.com

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@ -242,8 +242,8 @@ member (e.g. <a class="reference external" href="counting_iterator.html"><tt cla
into the temporary iterator <tt class="docutils literal"><span class="pre">p+n</span></tt>, which is destroyed when into the temporary iterator <tt class="docutils literal"><span class="pre">p+n</span></tt>, which is destroyed when
<tt class="docutils literal"><span class="pre">operator[]</span></tt> returns.</p> <tt class="docutils literal"><span class="pre">operator[]</span></tt> returns.</p>
<p>Writable iterators built with <tt class="docutils literal"><span class="pre">iterator_facade</span></tt> implement the <p>Writable iterators built with <tt class="docutils literal"><span class="pre">iterator_facade</span></tt> implement the
semantics required by the preferred resolution to <a class="reference external" href="http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-active.html#299">issue 299</a> and semantics required by the preferred resolution to <a class="reference external" href="http://anubis.dkuug.dk/jtc1/sc22/wg21/docs/lwg-active.html#299">issue 299</a> and
adopted by proposal <a class="reference external" href="http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2003/n1550.htm">n1550</a>: the result of <tt class="docutils literal"><span class="pre">p[n]</span></tt> is an object adopted by proposal <a class="reference external" href="http://anubis.dkuug.dk/JTC1/SC22/WG21/docs/papers/2003/n1550.html">n1550</a>: the result of <tt class="docutils literal"><span class="pre">p[n]</span></tt> is an object
convertible to the iterator's <tt class="docutils literal"><span class="pre">value_type</span></tt>, and <tt class="docutils literal"><span class="pre">p[n]</span> <span class="pre">=</span> <span class="pre">x</span></tt> is convertible to the iterator's <tt class="docutils literal"><span class="pre">value_type</span></tt>, and <tt class="docutils literal"><span class="pre">p[n]</span> <span class="pre">=</span> <span class="pre">x</span></tt> is
equivalent to <tt class="docutils literal"><span class="pre">*(p</span> <span class="pre">+</span> <span class="pre">n)</span> <span class="pre">=</span> <span class="pre">x</span></tt> (Note: This result object may be equivalent to <tt class="docutils literal"><span class="pre">*(p</span> <span class="pre">+</span> <span class="pre">n)</span> <span class="pre">=</span> <span class="pre">x</span></tt> (Note: This result object may be
implemented as a proxy containing a copy of <tt class="docutils literal"><span class="pre">p+n</span></tt>). This approach implemented as a proxy containing a copy of <tt class="docutils literal"><span class="pre">p+n</span></tt>). This approach

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@ -11,6 +11,7 @@
:organization: `Boost Consulting`_, Indiana University `Open Systems :organization: `Boost Consulting`_, Indiana University `Open Systems
Lab`_, University of Hanover `Institute for Transport Lab`_, University of Hanover `Institute for Transport
Railway Operation and Construction`_ Railway Operation and Construction`_
:date: $Date$
:copyright: Copyright David Abrahams, Jeremy Siek, and Thomas Witt 2003. :copyright: Copyright David Abrahams, Jeremy Siek, and Thomas Witt 2003.
.. _`Boost Consulting`: http://www.boost-consulting.com .. _`Boost Consulting`: http://www.boost-consulting.com

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@ -167,9 +167,9 @@ the implementation of her iterator is free to implement an
class; it will hide the one supplied by ``iterator_facade`` from class; it will hide the one supplied by ``iterator_facade`` from
clients of her iterator. clients of her iterator.
.. _n1550: http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2003/n1550.htm .. _n1550: http://anubis.dkuug.dk/JTC1/SC22/WG21/docs/papers/2003/n1550.html
.. _`issue 299`: http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-active.html#299 .. _`issue 299`: http://anubis.dkuug.dk/jtc1/sc22/wg21/docs/lwg-active.html#299
.. _`operator arrow`: .. _`operator arrow`:

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@ -106,7 +106,7 @@ The ``iterator_category`` member of ``iterator_facade`` is
.. parsed-literal:: .. parsed-literal::
*iterator-category*\ (CategoryOrTraversal, reference, value_type) *iterator-category*\ (CategoryOrTraversal, value_type, reference)
where *iterator-category* is defined as follows: where *iterator-category* is defined as follows:

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@ -3,10 +3,11 @@
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head> <head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta name="generator" content="Docutils 0.11: http://docutils.sourceforge.net/" /> <meta name="generator" content="Docutils 0.5: http://docutils.sourceforge.net/" />
<title>Iterator Traits</title> <title>Iterator Traits</title>
<meta name="author" content="David Abrahams" /> <meta name="author" content="David Abrahams" />
<meta name="organization" content="Boost Consulting" /> <meta name="organization" content="Boost Consulting" />
<meta name="date" content="2006-09-11" />
<meta name="copyright" content="Copyright David Abrahams 2004." /> <meta name="copyright" content="Copyright David Abrahams 2004." />
<link rel="stylesheet" href="../../../rst.css" type="text/css" /> <link rel="stylesheet" href="../../../rst.css" type="text/css" />
</head> </head>
@ -23,6 +24,8 @@
<td><a class="first last reference external" href="mailto:dave&#64;boost-consulting.com">dave&#64;boost-consulting.com</a></td></tr> <td><a class="first last reference external" href="mailto:dave&#64;boost-consulting.com">dave&#64;boost-consulting.com</a></td></tr>
<tr><th class="docinfo-name">Organization:</th> <tr><th class="docinfo-name">Organization:</th>
<td><a class="first last reference external" href="http://www.boost-consulting.com">Boost Consulting</a></td></tr> <td><a class="first last reference external" href="http://www.boost-consulting.com">Boost Consulting</a></td></tr>
<tr><th class="docinfo-name">Date:</th>
<td>2006-09-11</td></tr>
<tr><th class="docinfo-name">Copyright:</th> <tr><th class="docinfo-name">Copyright:</th>
<td>Copyright David Abrahams 2004.</td></tr> <td>Copyright David Abrahams 2004.</td></tr>
</tbody> </tbody>
@ -34,7 +37,7 @@
<col class="field-name" /> <col class="field-name" />
<col class="field-body" /> <col class="field-body" />
<tbody valign="top"> <tbody valign="top">
<tr class="field"><th class="field-name">abstract:</th><td class="field-body">Header <tt class="docutils literal">&lt;boost/iterator/iterator_traits.hpp&gt;</tt> provides <tr class="field"><th class="field-name">abstract:</th><td class="field-body">Header <tt class="docutils literal"><span class="pre">&lt;boost/iterator/iterator_traits.hpp&gt;</span></tt> provides
the ability to access an iterator's associated types using the ability to access an iterator's associated types using
MPL-compatible <a class="reference external" href="../../mpl/doc/index.html#metafunctions">metafunctions</a>.</td> MPL-compatible <a class="reference external" href="../../mpl/doc/index.html#metafunctions">metafunctions</a>.</td>
</tr> </tr>
@ -43,15 +46,15 @@ MPL-compatible <a class="reference external" href="../../mpl/doc/index.html#meta
<div class="section" id="overview"> <div class="section" id="overview">
<h1>Overview</h1> <h1>Overview</h1>
<p><tt class="docutils literal"><span class="pre">std::iterator_traits</span></tt> provides access to five associated types <p><tt class="docutils literal"><span class="pre">std::iterator_traits</span></tt> provides access to five associated types
of any iterator: its <tt class="docutils literal">value_type</tt>, <tt class="docutils literal">reference</tt>, <tt class="docutils literal">pointer</tt>, of any iterator: its <tt class="docutils literal"><span class="pre">value_type</span></tt>, <tt class="docutils literal"><span class="pre">reference</span></tt>, <tt class="docutils literal"><span class="pre">pointer</span></tt>,
<tt class="docutils literal">iterator_category</tt>, and <tt class="docutils literal">difference_type</tt>. Unfortunately, <tt class="docutils literal"><span class="pre">iterator_category</span></tt>, and <tt class="docutils literal"><span class="pre">difference_type</span></tt>. Unfortunately,
such a &quot;multi-valued&quot; traits template can be difficult to use in a such a &quot;multi-valued&quot; traits template can be difficult to use in a
metaprogramming context. <tt class="docutils literal">&lt;boost/iterator/iterator_traits.hpp&gt;</tt> metaprogramming context. <tt class="docutils literal"><span class="pre">&lt;boost/iterator/iterator_traits.hpp&gt;</span></tt>
provides access to these types using a standard <a class="reference external" href="../../mpl/doc/index.html#metafunctions">metafunctions</a>.</p> provides access to these types using a standard <a class="reference external" href="../../mpl/doc/index.html#metafunctions">metafunctions</a>.</p>
</div> </div>
<div class="section" id="summary"> <div class="section" id="summary">
<h1>Summary</h1> <h1>Summary</h1>
<p>Header <tt class="docutils literal">&lt;boost/iterator/iterator_traits.hpp&gt;</tt>:</p> <p>Header <tt class="docutils literal"><span class="pre">&lt;boost/iterator/iterator_traits.hpp&gt;</span></tt>:</p>
<pre class="literal-block"> <pre class="literal-block">
template &lt;class Iterator&gt; template &lt;class Iterator&gt;
struct iterator_value struct iterator_value
@ -95,6 +98,21 @@ struct iterator_category
}; };
</pre> </pre>
</div> </div>
<div class="section" id="broken-compiler-notes">
<h1>Broken Compiler Notes</h1>
<p>Because of workarounds in Boost, you may find that these
<a class="reference external" href="../../mpl/doc/index.html#metafunctions">metafunctions</a> actually work better than the facilities provided by
your compiler's standard library.</p>
<p>On compilers that don't support partial specialization, such as
Microsoft Visual C++ 6.0 or 7.0, you may need to manually invoke
<a class="reference external" href="../../type_traits/index.html#transformations">BOOST_BROKEN_COMPILER_TYPE_TRAITS_SPECIALIZATION</a> on the
<tt class="docutils literal"><span class="pre">value_type</span></tt> of pointers that are passed to these metafunctions.</p>
<p>Because of bugs in the implementation of GCC-2.9x, the name of
<tt class="docutils literal"><span class="pre">iterator_category</span></tt> is changed to <tt class="docutils literal"><span class="pre">iterator_category_</span></tt> on that
compiler. A macro, <tt class="docutils literal"><span class="pre">BOOST_ITERATOR_CATEGORY</span></tt>, that expands to
either <tt class="docutils literal"><span class="pre">iterator_category</span></tt> or <tt class="docutils literal"><span class="pre">iterator_category_</span></tt>, as
appropriate to the platform, is provided for portability.</p>
</div>
</div> </div>
<div class="footer"> <div class="footer">
<hr class="footer" /> <hr class="footer" />

View File

@ -9,6 +9,7 @@
:Author: David Abrahams :Author: David Abrahams
:Contact: dave@boost-consulting.com :Contact: dave@boost-consulting.com
:organization: `Boost Consulting`_ :organization: `Boost Consulting`_
:date: $Date$
:copyright: Copyright David Abrahams 2004. :copyright: Copyright David Abrahams 2004.
.. _`Boost Consulting`: http://www.boost-consulting.com .. _`Boost Consulting`: http://www.boost-consulting.com
@ -74,3 +75,24 @@ Header ``<boost/iterator/iterator_traits.hpp>``::
detail::iterator_traits<Iterator>::iterator_category detail::iterator_traits<Iterator>::iterator_category
type; type;
}; };
Broken Compiler Notes
=====================
Because of workarounds in Boost, you may find that these
metafunctions_ actually work better than the facilities provided by
your compiler's standard library.
On compilers that don't support partial specialization, such as
Microsoft Visual C++ 6.0 or 7.0, you may need to manually invoke
BOOST_BROKEN_COMPILER_TYPE_TRAITS_SPECIALIZATION_ on the
``value_type`` of pointers that are passed to these metafunctions.
Because of bugs in the implementation of GCC-2.9x, the name of
``iterator_category`` is changed to ``iterator_category_`` on that
compiler. A macro, ``BOOST_ITERATOR_CATEGORY``, that expands to
either ``iterator_category`` or ``iterator_category_``, as
appropriate to the platform, is provided for portability.
.. _BOOST_BROKEN_COMPILER_TYPE_TRAITS_SPECIALIZATION: ../../type_traits/index.html#transformations

View File

@ -27,10 +27,10 @@
Lab</a>, <a class="last reference external" href="http://www.styleadvisor.com">Zephyr Associates, Inc.</a></td></tr> Lab</a>, <a class="last reference external" href="http://www.styleadvisor.com">Zephyr Associates, Inc.</a></td></tr>
<tr><th class="docinfo-name">Date:</th> <tr><th class="docinfo-name">Date:</th>
<td>2006-09-11</td></tr> <td>2006-09-11</td></tr>
<tr class="field"><th class="docinfo-name">Number:</th><td class="field-body">This is a revised version of <a class="reference external" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2003/n1550.htm">n1550</a>=03-0133, which was <tr class="field"><th class="docinfo-name">Number:</th><td class="field-body">This is a revised version of <a class="reference external" href="http://anubis.dkuug.dk/jtc1/sc22/wg21/docs/papers/2003/n1550.html">n1550</a>=03-0133, which was
accepted for Technical Report 1 by the C++ standard accepted for Technical Report 1 by the C++ standard
committee's library working group. This proposal is a committee's library working group. This proposal is a
revision of paper <a class="reference external" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2001/n1297.html">n1297</a>, <a class="reference external" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2003/n1477.html">n1477</a>, and <a class="reference external" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2003/n1531.html">n1531</a>.</td> revision of paper <a class="reference external" href="http://anubis.dkuug.dk/jtc1/sc22/wg21/docs/papers/2001/n1297.html">n1297</a>, <a class="reference external" href="http://anubis.dkuug.dk/jtc1/sc22/wg21/docs/papers/2003/n1477.html">n1477</a>, and <a class="reference external" href="http://anubis.dkuug.dk/jtc1/sc22/wg21/docs/papers/2003/n1531.html">n1531</a>.</td>
</tr> </tr>
<tr><th class="docinfo-name">Copyright:</th> <tr><th class="docinfo-name">Copyright:</th>
<td>Copyright David Abrahams, Jeremy Siek, and Thomas Witt <td>Copyright David Abrahams, Jeremy Siek, and Thomas Witt
@ -127,12 +127,12 @@ requirements in the iterator categories.</p>
<td><tt class="docutils literal"><span class="pre">*i</span></tt> is convertible to <tt class="docutils literal"><span class="pre">T</span></tt></td> <td><tt class="docutils literal"><span class="pre">*i</span></tt> is convertible to <tt class="docutils literal"><span class="pre">T</span></tt></td>
</tr> </tr>
<tr><td>Forward Iterator</td> <tr><td>Forward Iterator</td>
<td><tt class="docutils literal"><span class="pre">*i</span></tt> is <tt class="docutils literal"><span class="pre">T&amp;</span></tt> (or <tt class="docutils literal"><span class="pre">const</span> <span class="pre">T&amp;</span></tt> once <a class="reference external" href="http://www.open-std.org/JTC1/SC22/WG21/docs/lwg-active.html#200">issue 200</a> <td><tt class="docutils literal"><span class="pre">*i</span></tt> is <tt class="docutils literal"><span class="pre">T&amp;</span></tt> (or <tt class="docutils literal"><span class="pre">const</span> <span class="pre">T&amp;</span></tt> once <a class="reference external" href="http://anubis.dkuug.dk/JTC1/SC22/WG21/docs/lwg-active.html#200">issue 200</a>
is resolved)</td> is resolved)</td>
</tr> </tr>
<tr><td>Random Access Iterator</td> <tr><td>Random Access Iterator</td>
<td><tt class="docutils literal"><span class="pre">i[n]</span></tt> is convertible to <tt class="docutils literal"><span class="pre">T</span></tt> (also <tt class="docutils literal"><span class="pre">i[n]</span> <span class="pre">=</span> <span class="pre">t</span></tt> <td><tt class="docutils literal"><span class="pre">i[n]</span></tt> is convertible to <tt class="docutils literal"><span class="pre">T</span></tt> (also <tt class="docutils literal"><span class="pre">i[n]</span> <span class="pre">=</span> <span class="pre">t</span></tt>
is required for mutable iterators once <a class="reference external" href="http://www.open-std.org/JTC1/SC22/WG21/docs/lwg-active.html#299">issue 299</a> is required for mutable iterators once <a class="reference external" href="http://anubis.dkuug.dk/JTC1/SC22/WG21/docs/lwg-active.html#299">issue 299</a>
is resolved)</td> is resolved)</td>
</tr> </tr>
</tbody> </tbody>
@ -141,7 +141,7 @@ is resolved)</td>
single hierarchy, many useful iterators can not be appropriately single hierarchy, many useful iterators can not be appropriately
categorized. For example, <tt class="docutils literal"><span class="pre">vector&lt;bool&gt;::iterator</span></tt> is almost a categorized. For example, <tt class="docutils literal"><span class="pre">vector&lt;bool&gt;::iterator</span></tt> is almost a
random access iterator, but the return type is not <tt class="docutils literal"><span class="pre">bool&amp;</span></tt> (see random access iterator, but the return type is not <tt class="docutils literal"><span class="pre">bool&amp;</span></tt> (see
<a class="reference external" href="http://www.open-std.org/JTC1/SC22/WG21/docs/lwg-active.html#96">issue 96</a> and Herb Sutter's paper J16/99-0008 = WG21 <a class="reference external" href="http://anubis.dkuug.dk/JTC1/SC22/WG21/docs/lwg-active.html#96">issue 96</a> and Herb Sutter's paper J16/99-0008 = WG21
N1185). Therefore, the iterators of <tt class="docutils literal"><span class="pre">vector&lt;bool&gt;</span></tt> only meet the N1185). Therefore, the iterators of <tt class="docutils literal"><span class="pre">vector&lt;bool&gt;</span></tt> only meet the
requirements of input iterator and output iterator. This is so requirements of input iterator and output iterator. This is so
nonintuitive that the C++ standard contradicts itself on this point. nonintuitive that the C++ standard contradicts itself on this point.
@ -344,7 +344,7 @@ approach for specifying <tt class="docutils literal"><span class="pre">operator[
direction would mean that an iterator satisfying the old Random Access direction would mean that an iterator satisfying the old Random Access
Iterator requirements would not necessarily be a model of Readable or Iterator requirements would not necessarily be a model of Readable or
Writable Lvalue Iterator. Instead we have chosen a design that Writable Lvalue Iterator. Instead we have chosen a design that
matches the preferred resolution of <a class="reference external" href="http://www.open-std.org/JTC1/SC22/WG21/docs/lwg-active.html#299">issue 299</a>: <tt class="docutils literal"><span class="pre">operator[]</span></tt> is matches the preferred resolution of <a class="reference external" href="http://anubis.dkuug.dk/JTC1/SC22/WG21/docs/lwg-active.html#299">issue 299</a>: <tt class="docutils literal"><span class="pre">operator[]</span></tt> is
only required to return something convertible to the <tt class="docutils literal"><span class="pre">value_type</span></tt> only required to return something convertible to the <tt class="docutils literal"><span class="pre">value_type</span></tt>
(for a Readable Iterator), and is required to support assignment (for a Readable Iterator), and is required to support assignment
<tt class="docutils literal"><span class="pre">i[n]</span> <span class="pre">=</span> <span class="pre">t</span></tt> (for a Writable Iterator).</p> <tt class="docutils literal"><span class="pre">i[n]</span> <span class="pre">=</span> <span class="pre">t</span></tt> (for a Writable Iterator).</p>
@ -976,7 +976,7 @@ struct random_access_traversal_tag : bidirectional_traversal_tag { };
<div class="section" id="addition-to-lib-iterator-traits"> <div class="section" id="addition-to-lib-iterator-traits">
<h2><a class="toc-backref" href="#id23">Addition to [lib.iterator.traits]</a></h2> <h2><a class="toc-backref" href="#id23">Addition to [lib.iterator.traits]</a></h2>
<p>The <tt class="docutils literal"><span class="pre">is_readable_iterator</span></tt> class <p>The <tt class="docutils literal"><span class="pre">is_readable_iterator</span></tt> class
template satisfies the <a class="reference external" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2003/n1519.htm">UnaryTypeTrait</a> requirements.</p> template satisfies the <a class="reference external" href="http://anubis.dkuug.dk/jtc1/sc22/wg21/docs/papers/2003/n1519.htm">UnaryTypeTrait</a> requirements.</p>
<p>Given an iterator type <tt class="docutils literal"><span class="pre">X</span></tt>, <tt class="docutils literal"><span class="pre">is_readable_iterator&lt;X&gt;::value</span></tt> <p>Given an iterator type <tt class="docutils literal"><span class="pre">X</span></tt>, <tt class="docutils literal"><span class="pre">is_readable_iterator&lt;X&gt;::value</span></tt>
yields <tt class="docutils literal"><span class="pre">true</span></tt> if, for an object <tt class="docutils literal"><span class="pre">a</span></tt> of type <tt class="docutils literal"><span class="pre">X</span></tt>, <tt class="docutils literal"><span class="pre">*a</span></tt> is yields <tt class="docutils literal"><span class="pre">true</span></tt> if, for an object <tt class="docutils literal"><span class="pre">a</span></tt> of type <tt class="docutils literal"><span class="pre">X</span></tt>, <tt class="docutils literal"><span class="pre">*a</span></tt> is
convertible to <tt class="docutils literal"><span class="pre">iterator_traits&lt;X&gt;::value_type</span></tt>, and <tt class="docutils literal"><span class="pre">false</span></tt> convertible to <tt class="docutils literal"><span class="pre">iterator_traits&lt;X&gt;::value_type</span></tt>, and <tt class="docutils literal"><span class="pre">false</span></tt>
@ -1007,7 +1007,7 @@ otherwise.</p>
</div> </div>
<div class="section" id="footnotes"> <div class="section" id="footnotes">
<h1><a class="toc-backref" href="#id24">Footnotes</a></h1> <h1><a class="toc-backref" href="#id24">Footnotes</a></h1>
<p>The UnaryTypeTrait concept is defined in <a class="reference external" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2003/n1519.htm">n1519</a>; the LWG is <p>The UnaryTypeTrait concept is defined in <a class="reference external" href="http://anubis.dkuug.dk/jtc1/sc22/wg21/docs/papers/2003/n1519.htm">n1519</a>; the LWG is
considering adding the requirement that specializations are derived considering adding the requirement that specializations are derived
from their nested <tt class="docutils literal"><span class="pre">::type</span></tt>.</p> from their nested <tt class="docutils literal"><span class="pre">::type</span></tt>.</p>
<!-- LocalWords: Abrahams Siek Witt const bool Sutter's WG int UL LI href Lvalue <!-- LocalWords: Abrahams Siek Witt const bool Sutter's WG int UL LI href Lvalue

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@ -13,6 +13,7 @@
:Contact: dave@boost-consulting.com, jsiek@osl.iu.edu, witt@styleadvisor.com :Contact: dave@boost-consulting.com, jsiek@osl.iu.edu, witt@styleadvisor.com
:organization: `Boost Consulting`_, Indiana University `Open Systems :organization: `Boost Consulting`_, Indiana University `Open Systems
Lab`_, `Zephyr Associates, Inc.`_ Lab`_, `Zephyr Associates, Inc.`_
:date: $Date$
:Number: This is a revised version of n1550_\ =03-0133, which was :Number: This is a revised version of n1550_\ =03-0133, which was
accepted for Technical Report 1 by the C++ standard accepted for Technical Report 1 by the C++ standard
@ -37,10 +38,10 @@
.. contents:: Table of Contents .. contents:: Table of Contents
.. _n1297: http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2001/n1297.html .. _n1297: http://anubis.dkuug.dk/jtc1/sc22/wg21/docs/papers/2001/n1297.html
.. _n1477: http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2003/n1477.html .. _n1477: http://anubis.dkuug.dk/jtc1/sc22/wg21/docs/papers/2003/n1477.html
.. _n1531: http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2003/n1531.html .. _n1531: http://anubis.dkuug.dk/jtc1/sc22/wg21/docs/papers/2003/n1531.html
.. _n1550: http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2003/n1550.htm .. _n1550: http://anubis.dkuug.dk/jtc1/sc22/wg21/docs/papers/2003/n1550.html
============ ============
Motivation Motivation
@ -75,8 +76,8 @@ requirements in the iterator categories.
| |is resolved) | | |is resolved) |
+------------------------+-----------------------------------------------------+ +------------------------+-----------------------------------------------------+
.. _issue 200: http://www.open-std.org/JTC1/SC22/WG21/docs/lwg-active.html#200 .. _issue 200: http://anubis.dkuug.dk/JTC1/SC22/WG21/docs/lwg-active.html#200
.. _issue 299: http://www.open-std.org/JTC1/SC22/WG21/docs/lwg-active.html#299 .. _issue 299: http://anubis.dkuug.dk/JTC1/SC22/WG21/docs/lwg-active.html#299
Because iterator traversal and value access are mixed together in a Because iterator traversal and value access are mixed together in a
@ -90,7 +91,7 @@ nonintuitive that the C++ standard contradicts itself on this point.
In paragraph 23.2.4/1 it says that a ``vector`` is a sequence that In paragraph 23.2.4/1 it says that a ``vector`` is a sequence that
supports random access iterators. supports random access iterators.
.. _issue 96: http://www.open-std.org/JTC1/SC22/WG21/docs/lwg-active.html#96 .. _issue 96: http://anubis.dkuug.dk/JTC1/SC22/WG21/docs/lwg-active.html#96
Another difficult-to-categorize iterator is the transform iterator, an Another difficult-to-categorize iterator is the transform iterator, an
adaptor which applies a unary function object to the dereferenced adaptor which applies a unary function object to the dereferenced
@ -790,7 +791,7 @@ The UnaryTypeTrait concept is defined in n1519_; the LWG is
considering adding the requirement that specializations are derived considering adding the requirement that specializations are derived
from their nested ``::type``. from their nested ``::type``.
.. _n1519: http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2003/n1519.htm .. _n1519: http://anubis.dkuug.dk/jtc1/sc22/wg21/docs/papers/2003/n1519.htm
.. ..
LocalWords: Abrahams Siek Witt const bool Sutter's WG int UL LI href Lvalue LocalWords: Abrahams Siek Witt const bool Sutter's WG int UL LI href Lvalue

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@ -10,6 +10,7 @@
:Contact: dave@boost-consulting.com, jsiek@osl.iu.edu :Contact: dave@boost-consulting.com, jsiek@osl.iu.edu
:organization: `Boost Consulting`_, Indiana University `Open Systems :organization: `Boost Consulting`_, Indiana University `Open Systems
Lab`_ Lab`_
:date: $Date$
:copyright: Copyright Toon Knapen, David Abrahams, Roland Richter, and Jeremy Siek 2003. :copyright: Copyright Toon Knapen, David Abrahams, Roland Richter, and Jeremy Siek 2003.
.. _`Boost Consulting`: http://www.boost-consulting.com .. _`Boost Consulting`: http://www.boost-consulting.com

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@ -9,6 +9,7 @@
:Author: David Abrahams :Author: David Abrahams
:Contact: dave@boost-consulting.com :Contact: dave@boost-consulting.com
:organization: `Boost Consulting`_ :organization: `Boost Consulting`_
:date: $Date$
:copyright: Copyright David Abrahams 2004. :copyright: Copyright David Abrahams 2004.
.. _`Boost Consulting`: http://www.boost-consulting.com .. _`Boost Consulting`: http://www.boost-consulting.com

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@ -1,3 +1,4 @@
[section:adaptor Iterator Adaptor] [section:adaptor Iterator Adaptor]
The `iterator_adaptor` class template adapts some `Base` [#base]_ The `iterator_adaptor` class template adapts some `Base` [#base]_
@ -46,7 +47,7 @@ that assumption.
, class Reference = use_default , class Reference = use_default
, class Difference = use_default , class Difference = use_default
> >
class iterator_adaptor class iterator_adaptor
: public iterator_facade<Derived, *V'*, *C'*, *R'*, *D'*> // see details : public iterator_facade<Derived, *V'*, *C'*, *R'*, *D'*> // see details
{ {
friend class iterator_core_access; friend class iterator_core_access;
@ -59,21 +60,21 @@ that assumption.
typedef iterator_adaptor iterator_adaptor\_; typedef iterator_adaptor iterator_adaptor\_;
Base const& base_reference() const; Base const& base_reference() const;
Base& base_reference(); Base& base_reference();
private: // Core iterator interface for iterator_facade. private: // Core iterator interface for iterator_facade.
typename iterator_adaptor::reference dereference() const; typename iterator_adaptor::reference dereference() const;
template < template <
class OtherDerived, class OtherIterator, class V, class C, class R, class D class OtherDerived, class OtherIterator, class V, class C, class R, class D
> >
bool equal(iterator_adaptor<OtherDerived, OtherIterator, V, C, R, D> const& x) const; bool equal(iterator_adaptor<OtherDerived, OtherIterator, V, C, R, D> const& x) const;
void advance(typename iterator_adaptor::difference_type n); void advance(typename iterator_adaptor::difference_type n);
void increment(); void increment();
void decrement(); void decrement();
template < template <
class OtherDerived, class OtherIterator, class V, class C, class R, class D class OtherDerived, class OtherIterator, class V, class C, class R, class D
> >
typename iterator_adaptor::difference_type distance_to( typename iterator_adaptor::difference_type distance_to(
iterator_adaptor<OtherDerived, OtherIterator, V, C, R, D> const& y) const; iterator_adaptor<OtherDerived, OtherIterator, V, C, R, D> const& y) const;
@ -131,8 +132,8 @@ above are defined as follows:
iterator_adaptor(); iterator_adaptor();
[*Requires:] The `Base` type must be Default Constructible.[br] [*Requires:] The `Base` type must be Default Constructible.\n
[*Returns:] An instance of `iterator_adaptor` with [*Returns:] An instance of `iterator_adaptor` with
`m_iterator` default constructed. `m_iterator` default constructed.
@ -166,7 +167,7 @@ above are defined as follows:
template < template <
class OtherDerived, class OtherIterator, class V, class C, class R, class D class OtherDerived, class OtherIterator, class V, class C, class R, class D
> >
bool equal(iterator_adaptor<OtherDerived, OtherIterator, V, C, R, D> const& x) const; bool equal(iterator_adaptor<OtherDerived, OtherIterator, V, C, R, D> const& x) const;
[*Returns:] `m_iterator == x.base()` [*Returns:] `m_iterator == x.base()`
@ -187,7 +188,7 @@ above are defined as follows:
template < template <
class OtherDerived, class OtherIterator, class V, class C, class R, class D class OtherDerived, class OtherIterator, class V, class C, class R, class D
> >
typename iterator_adaptor::difference_type distance_to( typename iterator_adaptor::difference_type distance_to(
iterator_adaptor<OtherDerived, OtherIterator, V, C, R, D> const& y) const; iterator_adaptor<OtherDerived, OtherIterator, V, C, R, D> const& y) const;
@ -205,7 +206,7 @@ we're going to pick up right where it left off.
.. |fac_tut| replace:: `iterator_facade` tutorial .. |fac_tut| replace:: `iterator_facade` tutorial
.. _fac_tut: iterator_facade.html#tutorial-example .. _fac_tut: iterator_facade.html#tutorial-example
[blurb [*`node_base*` really *is* an iterator][br][br] [blurb [*`node_base*` really *is* an iterator]\n\n
It's not really a very interesting iterator, since `node_base` It's not really a very interesting iterator, since `node_base`
is an abstract class: a pointer to a `node_base` just points is an abstract class: a pointer to a `node_base` just points
at some base subobject of an instance of some other class, and at some base subobject of an instance of some other class, and
@ -228,7 +229,7 @@ operations on the underlying pointer, via the `node_iterator`\ 's
|dereference_and_equal|_). The only real behavioral difference |dereference_and_equal|_). The only real behavioral difference
between `node_base*` and `node_iterator` can be observed when between `node_base*` and `node_iterator` can be observed when
they are incremented: `node_iterator` follows the they are incremented: `node_iterator` follows the
`m_next` pointer, while `node_base*` just applies an address offset. `m_next` pointer, while `node_base*` just applies an address offset.
.. |dereference_and_equal| replace:: `dereference` and `equal` member functions .. |dereference_and_equal| replace:: `dereference` and `equal` member functions
.. _dereference_and_equal: iterator_facade.html#implementing-the-core-operations .. _dereference_and_equal: iterator_facade.html#implementing-the-core-operations
@ -286,8 +287,8 @@ this technique is known not to work with Borland C++ 5.6.4 and
Metrowerks CodeWarrior versions prior to 9.0] Metrowerks CodeWarrior versions prior to 9.0]
You can see an example program that exercises this version of the You can see an example program that exercises this version of the
node iterators node iterators
[example_link node_iterator3.cpp..here]. [@../example/node_iterator3.cpp `here`].
In the case of `node_iter`, it's not very compelling to pass In the case of `node_iter`, it's not very compelling to pass
@ -305,7 +306,7 @@ types to its `Base` saves the implementor of
std::iterator_traits<Iterator>::*some-associated-type* std::iterator_traits<Iterator>::*some-associated-type*
at least four times. at least four times.
We urge you to review the documentation and implementations of We urge you to review the documentation and implementations of
|reverse_iterator|_ and the other Boost `specialized iterator |reverse_iterator|_ and the other Boost `specialized iterator
@ -329,4 +330,4 @@ __ index.html#specialized-adaptors
[endsect] [endsect]
[endsect] [endsect]

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@ -1,149 +0,0 @@
[section:algorithms Algorithms]
[section:advance Function template `advance()`]
The `boost::iterators::advance` function template is an adapted version of `std::advance` for the Boost iterator [link iterator.concepts.traversal traversal concepts].
[heading Header]
<boost/iterator/advance.hpp>
[heading Synopsis]
template <typename Iterator, typename Distance>
constexpr void advance(Iterator& it, Distance n);
[heading Description]
Moves `it` forward by `n` increments (or backward by `|n|` decrements if `n` is negative).
[heading Requirements]
`Iterator` should model Incrementable Iterator.
[heading Preconditions]
Let `it`[sub `i`] be the iterator obtained by incrementing (or decrementing if `n` is negative) `it` by `i`. All the iterators `it`[sub `i`] for `i` = 0, 1, 2, ..., `|n|` should be valid.
If `Iterator` does not model [link iterator.concepts.traversal.bidirectional Bidirectional Traversal Iterator], `n` should be non-negative.
[heading Complexity]
If `Iterator` models [link iterator.concepts.traversal.random_access Random Access Traversal Iterator], it takes constant time; otherwise it takes linear time.
[heading Notes]
* This function is not a customization point and is protected against being found by argument-dependent lookup (ADL).
* This function is `constexpr` only in C++14 or later.
[heading Acknowledgements]
Contributed by Michel Morin.
[endsect]
[section:distance Function template `distance()`]
The `boost::iterators::distance` function template is an adapted version of `std::distance` for the Boost iterator [link iterator.concepts.traversal traversal concepts].
[heading Header]
<boost/iterator/distance.hpp>
[heading Synopsis]
template <typename Iterator>
constexpr typename iterator_difference<Iterator>::type
distance(Iterator first, Iterator last);
[heading Description]
Computes the (signed) distance from `first` to `last`.
[heading Requirements]
`Iterator` should model [link iterator.concepts.traversal.single_pass Single Pass Iterator].
[heading Preconditions]
If `Iterator` models [link iterator.concepts.traversal.random_access Random Access Traversal Iterator], `[first, last)` or `[last, first)` should be valid; otherwise `[first, last)` should be valid.
[heading Complexity]
If `Iterator` models [link iterator.concepts.traversal.random_access Random Access Traversal Iterator], it takes constant time; otherwise it takes linear time.
[heading Notes]
* This function is not a customization point and is protected against being found by argument-dependent lookup (ADL).
* This function is `constexpr` only in C++14 or later.
[heading Acknowledgements]
Contributed by Michel Morin.
[endsect]
[section:next_prior Function templates `next()` and `prior()`]
Certain data types, such as the C++ Standard Library's forward and bidirectional iterators, do not provide addition and subtraction via `operator+()` or `operator-()`. This means that non-modifying computation of the next or prior value requires a temporary, even though `operator++()` or `operator--()` is provided. It also means that writing code like `itr+1` inside a template restricts the iterator category to random access iterators.
The `next()` and `prior()` functions defined in `boost/next_prior.hpp` provide a simple way around these problems.
[heading Synopsis]
template <class T>
T next(T x)
{
return ++x;
}
template <class T, class Distance>
T next(T x, Distance n)
{
std::advance(x, n);
return x;
}
template <class T>
T prior(T x)
{
return --x;
}
template <class T, class Distance>
T prior(T x, Distance n)
{
std::advance(x, -n);
return x;
}
[note Function implementations above are given for exposition only. The actual implementation has the same effect for iterators, but has different properties, as documented later.]
[heading Usage]
Usage is simple:
const std::list<T>::iterator p = get_some_iterator();
const std::list<T>::iterator prev = boost::prior(p);
const std::list<T>::iterator next = boost::next(prev, 2);
The distance from the given iterator should be supplied as an absolute value. For example, the iterator four iterators prior to the given iterator `p` may be obtained by `prior(p, 4)`.
With C++11, the Standard Library provides `std::next()` and `std::prev()` function templates, which serve the same purpose. However, there are advantages to `boost::next()` and `boost::prior()`.
First, `boost::next()` and `boost::prior()` are compatible not only with iterators but with any type that provides arithmetic operators `operator++()`, `operator--()`, `operator+()`, `operator-()`, `operator+=()` or `operator-=()`. For example, this is possible:
int x = 10;
int y = boost::next(x, 5);
assert(y == 15);
Second, `boost::next()` and `boost::prior()` use [link iterator.concepts.traversal traversal categories] to select the most efficient implementation. For some kinds of iterators, such as [link iterator.specialized.transform transform iterators], the standard iterator category does not reflect the traversal category correctly and therefore `std::next()` and `std::prev()` will fall back to linear complexity.
[heading Acknowledgements]
Contributed by [@http://www.boost.org/people/dave_abrahams.htm Dave Abrahams]. Two-argument versions by Daniel Walker.
[endsect]
[endsect]

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@ -1,3 +1,4 @@
[section:archetypes Iterator Archetypes] [section:archetypes Iterator Archetypes]
The `iterator_archetype` class constructs a minimal implementation of The `iterator_archetype` class constructs a minimal implementation of
@ -40,23 +41,23 @@ The access category types provided correspond to the following
standard iterator access concept combinations: standard iterator access concept combinations:
readable_iterator_t := readable_iterator_t :=
Readable Iterator Readable Iterator
writable_iterator_t := writable_iterator_t :=
Writeable Iterator Writeable Iterator
readable_writable_iterator_t := readable_writable_iterator_t :=
Readable Iterator & Writeable Iterator & Swappable Iterator Readable Iterator & Writeable Iterator & Swappable Iterator
readable_lvalue_iterator_t := readable_lvalue_iterator_t :=
Readable Iterator & Lvalue Iterator Readable Iterator & Lvalue Iterator
writeable_lvalue_iterator_t := writeable_lvalue_iterator_t :=
Readable Iterator & Writeable Iterator & Swappable Iterator & Lvalue Iterator Readable Iterator & Writeable Iterator & Swappable Iterator & Lvalue Iterator
[h3 Traits] [h3 Traits]
@ -65,25 +66,25 @@ The nested trait types are defined as follows:
if (AccessCategory == readable_iterator_t) if (AccessCategory == readable_iterator_t)
value_type = Value value_type = Value
reference = Value reference = Value
pointer = Value* pointer = Value*
else if (AccessCategory == writable_iterator_t) else if (AccessCategory == writable_iterator_t)
value_type = void value_type = void
reference = void reference = void
pointer = void pointer = void
else if (AccessCategory == readable_writable_iterator_t) else if (AccessCategory == readable_writable_iterator_t)
value_type = Value value_type = Value
reference := reference :=
A type X that is convertible to Value for which the following A type X that is convertible to Value for which the following
expression is valid. Given an object x of type X and v of type expression is valid. Given an object x of type X and v of type
Value. Value.
x = v x = v
@ -91,13 +92,13 @@ The nested trait types are defined as follows:
pointer = Value* pointer = Value*
else if (AccessCategory == readable_lvalue_iterator_t) else if (AccessCategory == readable_lvalue_iterator_t)
value_type = Value value_type = Value
reference = Value const& reference = Value const&
pointer = Value const* pointer = Value const*
else if (AccessCategory == writable_lvalue_iterator_t) else if (AccessCategory == writable_lvalue_iterator_t)
value_type = Value value_type = Value
reference = Value& reference = Value&
pointer = Value* pointer = Value*
@ -107,11 +108,11 @@ The nested trait types are defined as follows:
difference_type := ptrdiff_t difference_type := ptrdiff_t
else else
difference_type := unspecified type difference_type := unspecified type
iterator_category := iterator_category :=
A type X satisfying the following two constraints: A type X satisfying the following two constraints:
@ -155,4 +156,5 @@ the iterator concept specified by `AccessCategory` and
arguments. `iterator_archetype` does not model any other access arguments. `iterator_archetype` does not model any other access
concepts or any more derived traversal concepts. concepts or any more derived traversal concepts.
[endsect]
[endsect]

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@ -4,7 +4,7 @@ The iterator concept checking classes provide a mechanism for a
template to report better error messages when a user instantiates the template to report better error messages when a user instantiates the
template with a type that does not meet the requirements of the template with a type that does not meet the requirements of the
template. For an introduction to using concept checking classes, see template. For an introduction to using concept checking classes, see
the documentation for the _concept_check_ library. the documentation for the boost::concept_check library.
[h2 `iterator_concepts.hpp` Synopsis] [h2 `iterator_concepts.hpp` Synopsis]
@ -51,4 +51,4 @@ the documentation for the _concept_check_ library.
} }
[endsect] [endsect]

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@ -1,8 +1,9 @@
[section:concepts Iterator Concepts] [section:concepts Iterator Concepts]
[section:access Access] [section:concepts_access Access]
[section:readable Readable Iterator Concept] [h2 Readable Iterator Concept]
A class or built-in type `X` models the *Readable Iterator* concept A class or built-in type `X` models the *Readable Iterator* concept
for value type `T` if, in addition to `X` being Assignable and for value type `T` if, in addition to `X` being Assignable and
@ -31,18 +32,17 @@ type `T`.
[`U&`] [`U&`]
[pre: `(*a).m` is well-defined. Equivalent to `(*a).m`.] [pre: `(*a).m` is well-defined. Equivalent to `(*a).m`.]
] ]
] ]
[endsect] [h2 Writable Iterator Concept ]
[section:writable Writable Iterator Concept]
A class or built-in type `X` models the *Writable Iterator* concept A class or built-in type `X` models the *Writable Iterator* concept
if, in addition to `X` being Copy Constructible, the following if, in addition to `X` being Copy Constructible, the following
expressions are valid and respect the stated semantics. Writable expressions are valid and respect the stated semantics. Writable
Iterators have an associated *set of value types*. Iterators have an associated *set of value types*.
[table Writable Iterator Requirements (in addition to Copy Constructible) [table Writable Iterator Requirements (in addition to Copy Constructible)
[ [
[Expression] [Expression]
[Return Type] [Return Type]
@ -55,15 +55,13 @@ Iterators have an associated *set of value types*.
] ]
] ]
[endsect] [h2 Swappable Iterator Concept]
[section:swappable Swappable Iterator Concept]
A class or built-in type `X` models the *Swappable Iterator* concept A class or built-in type `X` models the *Swappable Iterator* concept
if, in addition to `X` being Copy Constructible, the following if, in addition to `X` being Copy Constructible, the following
expressions are valid and respect the stated semantics. expressions are valid and respect the stated semantics.
[table Swappable Iterator Requirements (in addition to Copy Constructible) [table Swappable Iterator Requirements (in addition to Copy Constructible)
[ [
[Expression] [Expression]
[Return Type] [Return Type]
@ -79,9 +77,7 @@ expressions are valid and respect the stated semantics.
[blurb *Note:* An iterator that is a model of the *Readable* and *Writable Iterator* concepts [blurb *Note:* An iterator that is a model of the *Readable* and *Writable Iterator* concepts
is also a model of *Swappable Iterator*. *--end note*] is also a model of *Swappable Iterator*. *--end note*]
[endsect] [h2 Lvalue Iterator Concept]
[section:lvalue Lvalue Iterator Concept]
The *Lvalue Iterator* concept adds the requirement that the return The *Lvalue Iterator* concept adds the requirement that the return
type of `operator*` type be a reference to the value type of the type of `operator*` type be a reference to the value type of the
@ -105,17 +101,17 @@ iterator.
[endsect] [endsect]
[endsect] [section:concepts_traversal Traversal]
[section:traversal Traversal] [h2 Incrementable Iterator Concept]
[section:incrementable Incrementable Iterator Concept]
A class or built-in type `X` models the *Incrementable Iterator* A class or built-in type `X` models the *Incrementable Iterator*
concept if, in addition to `X` being Assignable and Copy concept if, in addition to `X` being Assignable and Copy
Constructible, the following expressions are valid and respect the Constructible, the following expressions are valid and respect the
stated semantics. stated semantics.
[table Incrementable Iterator Requirements (in addition to Assignable, Copy Constructible) [table Incrementable Iterator Requirements (in addition to Assignable, Copy Constructible)
[ [
[Expression ] [Expression ]
@ -133,7 +129,7 @@ stated semantics.
[`` [``
{ {
X tmp = r; X tmp = r;
++r; ++r;
return tmp; return tmp;
} }
``] ``]
@ -145,9 +141,7 @@ stated semantics.
] ]
] ]
[endsect] [h2 Single Pass Iterator Concept]
[section:single_pass Single Pass Iterator Concept]
A class or built-in type `X` models the *Single Pass Iterator* A class or built-in type `X` models the *Single Pass Iterator*
concept if the following expressions are valid and respect the stated concept if the following expressions are valid and respect the stated
@ -162,7 +156,7 @@ semantics.
[ [
[`++r`] [`++r`]
[`X&`] [`X&`]
[pre:[br]`r` is dereferenceable;[br]post:[br]`r` is dereferenceable or[br]`r` is past-the-end] [pre:\n`r` is dereferenceable;\npost:\n`r` is dereferenceable or\n`r` is past-the-end]
] ]
[ [
[`a == b`] [`a == b`]
@ -174,11 +168,6 @@ semantics.
[convertible to `bool`] [convertible to `bool`]
[`!(a == b)`] [`!(a == b)`]
] ]
[
[`iterator_traits<X>::difference_type`]
[A signed integral type representing the distance between iterators]
[]
]
[ [
[`iterator_traversal<X>::type`] [`iterator_traversal<X>::type`]
[Convertible to`single_pass_traversal_tag`] [Convertible to`single_pass_traversal_tag`]
@ -186,9 +175,8 @@ semantics.
] ]
] ]
[endsect]
[section:forward Forward Traversal Concept] [h2 Forward Traversal Concept]
A class or built-in type `X` models the *Forward Traversal* A class or built-in type `X` models the *Forward Traversal*
concept if, in addition to `X` meeting the requirements of Default concept if, in addition to `X` meeting the requirements of Default
@ -211,6 +199,11 @@ valid and respect the stated semantics.
[`X&`] [`X&`]
[`r == s` and `r` is dereferenceable implies `++r == ++s.`] [`r == s` and `r` is dereferenceable implies `++r == ++s.`]
] ]
[
[`iterator_traits<X>::difference_type`]
[A signed integral type representing the distance between iterators]
[]
]
[ [
[`iterator_traversal<X>::type`] [`iterator_traversal<X>::type`]
[Convertible to `forward_traversal_tag`] [Convertible to `forward_traversal_tag`]
@ -218,9 +211,7 @@ valid and respect the stated semantics.
] ]
] ]
[endsect] [h2 Bidirectional Traversal Concept]
[section:bidirectional Bidirectional Traversal Concept]
A class or built-in type `X` models the *Bidirectional Traversal* A class or built-in type `X` models the *Bidirectional Traversal*
concept if, in addition to `X` meeting the requirements of Forward concept if, in addition to `X` meeting the requirements of Forward
@ -232,11 +223,11 @@ the stated semantics.
[Expression] [Expression]
[Return Type] [Return Type]
[Assertion/Semantics/Pre-/Post-condition] [Assertion/Semantics/Pre-/Post-condition]
] ]
[ [
[`--r`] [`--r`]
[`X&`] [`X&`]
[pre: there exists `s` such that `r == ++s`.[br] post: `s` is dereferenceable. `--(++r) == r`. `--r == --s` implies `r == s`. `&r == &--r`.] [pre: there exists `s` such that `r == ++s`.\n post: `s` is dereferenceable. `--(++r) == r`. `--r == --s` implies `r == s`. `&r == &--r`.]
] ]
[ [
[`r--`] [`r--`]
@ -256,9 +247,7 @@ the stated semantics.
] ]
] ]
[endsect] [h2 Random Access Traversal Concept]
[section:random_access Random Access Traversal Concept]
A class or built-in type `X` models the *Random Access Traversal* A class or built-in type `X` models the *Random Access Traversal*
concept if the following expressions are valid and respect the stated concept if the following expressions are valid and respect the stated
@ -266,8 +255,8 @@ semantics. In the table below, `Distance` is
`iterator_traits<X>::difference_type` and `n` represents a `iterator_traits<X>::difference_type` and `n` represents a
constant object of type `Distance`. constant object of type `Distance`.
[table Random Access Traversal Iterator Requirements (in addition to Bidirectional Traversal) [table Random Access Traversal Iterator Requirements (in addition to Bidirectional Traversal)
[ [
[Expression] [Expression]
[Return Type] [Return Type]
[Operational Semantics] [Operational Semantics]
@ -277,10 +266,10 @@ constant object of type `Distance`.
[`r += n`] [`r += n`]
[ `X&`] [ `X&`]
[`` [``
{ {
Distance m = n; Distance m = n;
if (m >= 0) if (m >= 0)
while (m--) while (m--)
++r; ++r;
else else
while (m++) while (m++)
@ -290,18 +279,18 @@ constant object of type `Distance`.
``] ``]
[ ] [ ]
] ]
[ [
[`a + n`, `n + a`] [`a + n`, `n + a`]
[`X`] [`X`]
[`` [``
{ {
X tmp = a; X tmp = a;
return tmp+= n; return tmp+= n;
} }
``] ``]
[] []
] ]
[ [
[`r -= n`] [`r -= n`]
[`X&`] [`X&`]
[`return r += -n`] [`return r += -n`]
@ -311,9 +300,9 @@ constant object of type `Distance`.
[`a - n`] [`a - n`]
[`X`] [`X`]
[`` [``
{ {
X tmp = a; X tmp = a;
return tmp-= n; return tmp-= n;
} }
``] ``]
[] []
@ -325,13 +314,13 @@ constant object of type `Distance`.
[pre: there exists a value `n` of `Distance` such that `a + n == b`. `b == a + (b - a)`.] [pre: there exists a value `n` of `Distance` such that `a + n == b`. `b == a + (b - a)`.]
] ]
[ [
[`a[n]`] [`a\[n\]`]
[convertible to T] [convertible to T]
[`*(a + n)`] [`*(a + n)`]
[pre: a is a *Readable Iterator*] [pre: a is a *Readable Iterator*]
] ]
[ [
[`a[n] = v`] [`a\[n\] = v`]
[convertible to T] [convertible to T]
[`*(a + n) = v`] [`*(a + n) = v`]
[pre: a is a *Writable iterator*] [pre: a is a *Writable iterator*]
@ -370,6 +359,4 @@ constant object of type `Distance`.
[endsect] [endsect]
[endsect] [endsect]
[endsect]

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@ -1,3 +1,4 @@
[section:counting Counting Iterator] [section:counting Counting Iterator]
A `counting_iterator` adapts an object by adding an `operator*` that A `counting_iterator` adapts an object by adding an `operator*` that
@ -17,30 +18,28 @@ into the first array via indirection through the second array.
std::vector<int> numbers; std::vector<int> numbers;
typedef std::vector<int>::iterator n_iter; typedef std::vector<int>::iterator n_iter;
std::copy(boost::counting_iterator<int>(0), std::copy(boost::counting_iterator<int>(0),
boost::counting_iterator<int>(N), boost::counting_iterator<int>(N),
std::back_inserter(numbers)); std::back_inserter(numbers));
std::vector<std::vector<int>::iterator> pointers; std::vector<std::vector<int>::iterator> pointers;
std::copy(boost::make_counting_iterator(numbers.begin()), std::copy(boost::make_counting_iterator(numbers.begin()),
boost::make_counting_iterator(numbers.end()), boost::make_counting_iterator(numbers.end()),
std::back_inserter(pointers)); std::back_inserter(pointers));
std::cout << "indirectly printing out the numbers from 0 to " std::cout << "indirectly printing out the numbers from 0 to "
<< N << std::endl; << N << std::endl;
std::copy(boost::make_indirect_iterator(pointers.begin()), std::copy(boost::make_indirect_iterator(pointers.begin()),
boost::make_indirect_iterator(pointers.end()), boost::make_indirect_iterator(pointers.end()),
std::ostream_iterator<int>(std::cout, " ")); std::ostream_iterator<int>(std::cout, " "));
std::cout << std::endl; std::cout << std::endl;
The output is: The output is:
[pre indirectly printing out the numbers from 0 to 7
indirectly printing out the numbers from 0 to 7 0 1 2 3 4 5 6
0 1 2 3 4 5 6
]
The source code for this example can be found [example_link counting_iterator_example.cpp..here]. The source code for this example can be found [@../example/counting_iterator_example.cpp here].
[h2 Reference] [h2 Reference]
@ -87,9 +86,9 @@ algorithm:
random_access_traversal_tag, Incrementable, const Incrementable&) random_access_traversal_tag, Incrementable, const Incrementable&)
else else
return |iterator-category|_\ ( return |iterator-category|_\ (
iterator_traversal<Incrementable>::type, iterator_traversal<Incrementable>::type,
Incrementable, const Incrementable&) Incrementable, const Incrementable&)
[blurb *Note:* implementers are encouraged to provide an implementation of [blurb *Note:* implementers are encouraged to provide an implementation of
`operator-` and a `difference_type` that avoids overflows in `operator-` and a `difference_type` that avoids overflows in
the cases where `std::numeric_limits<Incrementable>::is_specialized` the cases where `std::numeric_limits<Incrementable>::is_specialized`
@ -153,7 +152,7 @@ operations.
counting_iterator(); counting_iterator();
[*Requires: ] `Incrementable` is Default Constructible.[br] [*Requires: ] `Incrementable` is Default Constructible.\n
[*Effects: ] Default construct the member `m_inc`. [*Effects: ] Default construct the member `m_inc`.
@ -175,14 +174,14 @@ operations.
counting_iterator& operator++(); counting_iterator& operator++();
[*Effects: ] `++m_inc`[br] [*Effects: ] `++m_inc`\n
[*Returns: ] `*this` [*Returns: ] `*this`
counting_iterator& operator--(); counting_iterator& operator--();
[*Effects: ] `--m_inc`[br] [*Effects: ] `--m_inc`\n
[*Returns: ] `*this` [*Returns: ] `*this`
Incrementable const& base() const; Incrementable const& base() const;
@ -190,4 +189,4 @@ operations.
[*Returns: ] `m_inc` [*Returns: ] `m_inc`
[endsect] [endsect]

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@ -1,3 +1,4 @@
[section:facade Iterator Facade] [section:facade Iterator Facade]
While the iterator interface is rich, there is a core subset of the While the iterator interface is rich, there is a core subset of the
@ -67,7 +68,6 @@ requirements.
[ [
[`i.dereference()`] [`i.dereference()`]
[Access the value referred to] [Access the value referred to]
]
[ [
[`i.equal(j)`] [`i.equal(j)`]
[Compare for equality with `j`] [Compare for equality with `j`]
@ -83,7 +83,6 @@ requirements.
[ [
[`i.advance(n)`] [`i.advance(n)`]
[Advance by `n` positions] [Advance by `n` positions]
]
[ [
[`i.distance_to(j)`] [`i.distance_to(j)`]
[Measure the distance to `j`] [Measure the distance to `j`]
@ -140,7 +139,7 @@ standardize the gateway protocol. Note that even if
open a safety loophole, as every core member function preserves the open a safety loophole, as every core member function preserves the
invariants of the iterator. invariants of the iterator.
[h2 `operator[]`] [h2 `operator\[\]`]
The indexing operator for a generalized iterator presents special The indexing operator for a generalized iterator presents special
challenges. A random access iterator's `operator[]` is only challenges. A random access iterator's `operator[]` is only
@ -166,9 +165,9 @@ the implementation of her iterator is free to implement an
class; it will hide the one supplied by `iterator_facade` from class; it will hide the one supplied by `iterator_facade` from
clients of her iterator. clients of her iterator.
.. _n1550: http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2003/n1550.htm .. _n1550: http://anubis.dkuug.dk/JTC1/SC22/WG21/docs/papers/2003/n1550.html
.. _`issue 299`: http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-active.html#299 .. _`issue 299`: http://anubis.dkuug.dk/jtc1/sc22/wg21/docs/lwg-active.html#299
.. _`operator arrow`: .. _`operator arrow`:
@ -288,7 +287,7 @@ The `iterator_category` member of `iterator_facade` is
.. parsed-literal:: .. parsed-literal::
*iterator-category*\ (CategoryOrTraversal, reference, value_type) *iterator-category*\ (CategoryOrTraversal, value_type, reference)
where *iterator-category* is defined as follows: where *iterator-category* is defined as follows:
@ -296,10 +295,10 @@ where *iterator-category* is defined as follows:
The `enable_if_interoperable` template used above is for exposition The `enable_if_interoperable` template used above is for exposition
purposes. The member operators should only be in an overload set purposes. The member operators should only be in an overload set
provided the derived types `Dr1` and `Dr2` are interoperable, provided the derived types `Dr1` and `Dr2` are interoperable,
meaning that at least one of the types is convertible to the other. The meaning that at least one of the types is convertible to the other. The
`enable_if_interoperable` approach uses SFINAE to take the operators `enable_if_interoperable` approach uses SFINAE to take the operators
out of the overload set when the types are not interoperable. out of the overload set when the types are not interoperable.
The operators should behave *as-if* `enable_if_interoperable` The operators should behave *as-if* `enable_if_interoperable`
were defined to be: were defined to be:
@ -399,7 +398,7 @@ through member functions of class `iterator_core_access`.
__ `operator arrow`_ __ `operator arrow`_
[*Returns:] If `reference` is a reference type, an object of type `pointer` equal to: `&static_cast<Derived const*>(this)->dereference()` [*Returns:] If `reference` is a reference type, an object of type `pointer` equal to: `&static_cast<Derived const*>(this)->dereference()`
Otherwise returns an object of unspecified type such that, Otherwise returns an object of unspecified type such that,
`(*static_cast<Derived const*>(this))->m` is equivalent to `(w = **static_cast<Derived const*>(this), `(*static_cast<Derived const*>(this))->m` is equivalent to `(w = **static_cast<Derived const*>(this),
w.m)` for some temporary object `w` of type `value_type`. w.m)` for some temporary object `w` of type `value_type`.
@ -416,7 +415,7 @@ w.m)` for some temporary object `w` of type `value_type`.
Derived& operator++(); Derived& operator++();
[*Effects:] [*Effects:]
static_cast<Derived*>(this)->increment(); static_cast<Derived*>(this)->increment();
return *static_cast<Derived*>(this); return *static_cast<Derived*>(this);
@ -456,7 +455,7 @@ w.m)` for some temporary object `w` of type `value_type`.
Derived& operator-=(difference_type n); Derived& operator-=(difference_type n);
[*Effects:] [*Effects:]
static_cast<Derived*>(this)->advance(-n); static_cast<Derived*>(this)->advance(-n);
return *static_cast<Derived*>(this); return *static_cast<Derived*>(this);
@ -488,16 +487,14 @@ w.m)` for some temporary object `w` of type `value_type`.
iterator_facade<Dr2,V2,TC2,R2,D2> const& rhs); iterator_facade<Dr2,V2,TC2,R2,D2> const& rhs);
[*Returns:] [*Returns:]
[pre
if `is_convertible<Dr2,Dr1>::value` if `is_convertible<Dr2,Dr1>::value`
then then
`((Dr1 const&)lhs).equal((Dr2 const&)rhs)`. `((Dr1 const&)lhs).equal((Dr2 const&)rhs)`.
Otherwise, Otherwise,
`((Dr2 const&)rhs).equal((Dr1 const&)lhs)`. `((Dr2 const&)rhs).equal((Dr1 const&)lhs)`.
]
template <class Dr1, class V1, class TC1, class R1, class D1, template <class Dr1, class V1, class TC1, class R1, class D1,
@ -507,16 +504,14 @@ w.m)` for some temporary object `w` of type `value_type`.
iterator_facade<Dr2,V2,TC2,R2,D2> const& rhs); iterator_facade<Dr2,V2,TC2,R2,D2> const& rhs);
[*Returns:] [*Returns:]
[pre
if `is_convertible<Dr2,Dr1>::value` if `is_convertible<Dr2,Dr1>::value`
then then
`!((Dr1 const&)lhs).equal((Dr2 const&)rhs)`. `!((Dr1 const&)lhs).equal((Dr2 const&)rhs)`.
Otherwise, Otherwise,
`!((Dr2 const&)rhs).equal((Dr1 const&)lhs)`. `!((Dr2 const&)rhs).equal((Dr1 const&)lhs)`.
]
template <class Dr1, class V1, class TC1, class R1, class D1, template <class Dr1, class V1, class TC1, class R1, class D1,
@ -526,16 +521,14 @@ w.m)` for some temporary object `w` of type `value_type`.
iterator_facade<Dr2,V2,TC2,R2,D2> const& rhs); iterator_facade<Dr2,V2,TC2,R2,D2> const& rhs);
[*Returns:] [*Returns:]
[pre
if `is_convertible<Dr2,Dr1>::value` if `is_convertible<Dr2,Dr1>::value`
then then
`((Dr1 const&)lhs).distance_to((Dr2 const&)rhs) < 0`. `((Dr1 const&)lhs).distance_to((Dr2 const&)rhs) < 0`.
Otherwise, Otherwise,
`((Dr2 const&)rhs).distance_to((Dr1 const&)lhs) > 0`. `((Dr2 const&)rhs).distance_to((Dr1 const&)lhs) > 0`.
]
template <class Dr1, class V1, class TC1, class R1, class D1, template <class Dr1, class V1, class TC1, class R1, class D1,
@ -545,16 +538,14 @@ w.m)` for some temporary object `w` of type `value_type`.
iterator_facade<Dr2,V2,TC2,R2,D2> const& rhs); iterator_facade<Dr2,V2,TC2,R2,D2> const& rhs);
[*Returns:] [*Returns:]
[pre
if `is_convertible<Dr2,Dr1>::value` if `is_convertible<Dr2,Dr1>::value`
then then
`((Dr1 const&)lhs).distance_to((Dr2 const&)rhs) <= 0`. `((Dr1 const&)lhs).distance_to((Dr2 const&)rhs) <= 0`.
Otherwise, Otherwise,
`((Dr2 const&)rhs).distance_to((Dr1 const&)lhs) >= 0`. `((Dr2 const&)rhs).distance_to((Dr1 const&)lhs) >= 0`.
]
template <class Dr1, class V1, class TC1, class R1, class D1, template <class Dr1, class V1, class TC1, class R1, class D1,
@ -564,16 +555,14 @@ w.m)` for some temporary object `w` of type `value_type`.
iterator_facade<Dr2,V2,TC2,R2,D2> const& rhs); iterator_facade<Dr2,V2,TC2,R2,D2> const& rhs);
[*Returns:] [*Returns:]
[pre
if `is_convertible<Dr2,Dr1>::value` if `is_convertible<Dr2,Dr1>::value`
then then
`((Dr1 const&)lhs).distance_to((Dr2 const&)rhs) > 0`. `((Dr1 const&)lhs).distance_to((Dr2 const&)rhs) > 0`.
Otherwise, Otherwise,
`((Dr2 const&)rhs).distance_to((Dr1 const&)lhs) < 0`. `((Dr2 const&)rhs).distance_to((Dr1 const&)lhs) < 0`.
]
template <class Dr1, class V1, class TC1, class R1, class D1, template <class Dr1, class V1, class TC1, class R1, class D1,
@ -583,16 +572,14 @@ w.m)` for some temporary object `w` of type `value_type`.
iterator_facade<Dr2,V2,TC2,R2,D2> const& rhs); iterator_facade<Dr2,V2,TC2,R2,D2> const& rhs);
[*Returns:] [*Returns:]
[pre
if `is_convertible<Dr2,Dr1>::value` if `is_convertible<Dr2,Dr1>::value`
then then
`((Dr1 const&)lhs).distance_to((Dr2 const&)rhs) >= 0`. `((Dr1 const&)lhs).distance_to((Dr2 const&)rhs) >= 0`.
Otherwise, Otherwise,
`((Dr2 const&)rhs).distance_to((Dr1 const&)lhs) <= 0`. `((Dr2 const&)rhs).distance_to((Dr1 const&)lhs) <= 0`.
]
.. _minus: .. _minus:
@ -604,33 +591,29 @@ w.m)` for some temporary object `w` of type `value_type`.
iterator_facade<Dr2,V2,TC2,R2,D2> const& rhs); iterator_facade<Dr2,V2,TC2,R2,D2> const& rhs);
[*Return Type:] [*Return Type:]
[pre
if `is_convertible<Dr2,Dr1>::value` if `is_convertible<Dr2,Dr1>::value`
then then
`difference` shall be `difference` shall be
`iterator_traits<Dr1>::difference_type`. `iterator_traits<Dr1>::difference_type`.
Otherwise Otherwise
`difference` shall be `iterator_traits<Dr2>::difference_type` `difference` shall be `iterator_traits<Dr2>::difference_type`
]
[*Returns:] [*Returns:]
[pre
if `is_convertible<Dr2,Dr1>::value` if `is_convertible<Dr2,Dr1>::value`
then then
`-((Dr1 const&)lhs).distance_to((Dr2 const&)rhs)`. `-((Dr1 const&)lhs).distance_to((Dr2 const&)rhs)`.
Otherwise, Otherwise,
`((Dr2 const&)rhs).distance_to((Dr1 const&)lhs)`. `((Dr2 const&)rhs).distance_to((Dr1 const&)lhs)`.
]
[endsect] [endsect]
[include facade_tutorial.qbk] [include facade_tutorial.qbk]
[endsect] [endsect]

View File

@ -1,11 +1,12 @@
[section:facade_tutorial Tutorial] [section:facade_tutorial Tutorial]
In this section we'll walk through the implementation of a few In this section we'll walk through the implementation of a few
iterators using `iterator_facade`, based around the simple iterators using `iterator_facade`, based around the simple
example of a linked list of polymorphic objects. This example was example of a linked list of polymorphic objects. This example was
inspired by a inspired by a
[@http://thread.gmane.org/gmane.comp.lib.boost.user/5100 `posting`] [@http://thread.gmane.org/gmane.comp.lib.boost.user/5100 `posting`]
by Keith Macdonald on the by Keith Macdonald on the
[@http://www.boost.org/more/mailing_lists.htm#users `Boost-Users`] [@http://www.boost.org/more/mailing_lists.htm#users `Boost-Users`]
mailing list. mailing list.
@ -29,16 +30,16 @@ Say we've written a polymorphic linked list node base class:
// print to the stream // print to the stream
virtual void print(std::ostream& s) const = 0; virtual void print(std::ostream& s) const = 0;
// double the value // double the value
virtual void double_me() = 0; virtual void double_me() = 0;
void append(node_base* p) void append(node_base* p)
{ {
if (m_next) if (m_next)
m_next->append(p); m_next->append(p);
else else
m_next = p; m_next = p;
} }
private: private:
@ -209,7 +210,7 @@ the concepts we want our iterator to model. Referring to the
table__, we can see that the first three rows are applicable table__, we can see that the first three rows are applicable
because `node_iterator` needs to satisfy the requirements for because `node_iterator` needs to satisfy the requirements for
`readable iterator`_, `single pass iterator`_, and `incrementable `readable iterator`_, `single pass iterator`_, and `incrementable
iterator`_. iterator`_.
__ `core operations`_ __ `core operations`_
@ -253,24 +254,24 @@ make them private and grant friendship to
}; };
Voila; a complete and conforming readable, forward-traversal Voila; a complete and conforming readable, forward-traversal
iterator! For a working example of its use, see iterator! For a working example of its use, see
[example_link node_iterator1.cpp..this program]. [@../example/node_iterator1.cpp `this program`].
__ ../../example/node_iterator1.cpp __ ../example/node_iterator1.cpp
[h2 A constant `node_iterator`] [h2 A constant `node_iterator`]
[blurb *Constant and Mutable iterators*[br][br] [blurb *Constant and Mutable iterators*\n\n
The term **mutable iterator** means an iterator through which The term **mutable iterator** means an iterator through which
the object it references (its "referent") can be modified. A the object it references (its "referent") can be modified. A
**constant iterator** is one which doesn't allow modification of **constant iterator** is one which doesn't allow modification of
its referent.[br][br] its referent.\n\n
The words *constant* and *mutable* don't refer to the ability to The words *constant* and *mutable* don't refer to the ability to
modify the iterator itself. For example, an `int const*` is a modify the iterator itself. For example, an `int const*` is a
non-\ `const` *constant iterator*, which can be incremented non-\ `const` *constant iterator*, which can be incremented
but doesn't allow modification of its referent, and `int* but doesn't allow modification of its referent, and `int*
const` is a `const` *mutable iterator*, which cannot be const` is a `const` *mutable iterator*, which cannot be
modified but which allows modification of its referent.[br][br] modified but which allows modification of its referent.\n\n
Confusing? We agree, but those are the standard terms. It Confusing? We agree, but those are the standard terms. It
probably doesn't help much that a container's constant iterator probably doesn't help much that a container's constant iterator
is called `const_iterator`. is called `const_iterator`.
@ -284,7 +285,7 @@ changes:
class const_node_iterator class const_node_iterator
: public boost::iterator_facade< : public boost::iterator_facade<
const_node_iterator node_iterator
, node_base **const** , node_base **const**
, boost::forward_traversal_tag , boost::forward_traversal_tag
> >
@ -311,7 +312,7 @@ changes:
node_base **const**\ * m_node; node_base **const**\ * m_node;
}; };
[blurb `const` and an iterator's `value_type`[br][br] [blurb `const` and an iterator's `value_type`\n\n
The C++ standard requires an iterator's `value_type` *not* be The C++ standard requires an iterator's `value_type` *not* be
`const`\ -qualified, so `iterator_facade` strips the `const`\ -qualified, so `iterator_facade` strips the
`const` from its `Value` parameter in order to produce the `const` from its `Value` parameter in order to produce the
@ -401,7 +402,7 @@ adding a templatized converting constructor [#broken]_ [#random]_:
template <class OtherValue> template <class OtherValue>
bool equal(node_iter<OtherValue> const& other) const bool equal(node_iter<OtherValue> const& other) const
{ {
return this->m_node == other.m_node; return this->m_node == other.m_node;
} }
@ -427,11 +428,11 @@ adding a templatized converting constructor [#broken]_ [#random]_:
`distance_to` function as well. `distance_to` function as well.
__ ../../example/node_iterator2.hpp __ ../example/node_iterator2.hpp
You can see an example program which exercises our interoperable You can see an example program which exercises our interoperable
iterators iterators
[example_link node_iterator2.cpp..here]. [@../example/node_iterator2.cpp `here`].
[h2 Telling the Truth] [h2 Telling the Truth]
@ -466,7 +467,7 @@ appropriate:
... ...
private: private:
struct enabler {}; struct enabler {};
public: public:

View File

@ -1,3 +1,4 @@
[section:filter Filter Iterator] [section:filter Filter Iterator]
The filter iterator adaptor creates a view of an iterator range in The filter iterator adaptor creates a view of an iterator range in
@ -18,6 +19,7 @@ This example uses `filter_iterator` and then
array of integers. Then `make_filter_iterator` is is used to output array of integers. Then `make_filter_iterator` is is used to output
the integers greater than `-2`. the integers greater than `-2`.
struct is_positive_number { struct is_positive_number {
bool operator()(int x) { return 0 < x; } bool operator()(int x) { return 0 < x; }
}; };
@ -31,7 +33,7 @@ the integers greater than `-2`.
base_iterator numbers(numbers_); base_iterator numbers(numbers_);
// Example using filter_iterator // Example using filter_iterator
typedef boost::filter_iterator<is_positive_number, base_iterator> typedef boost::filter_iterator<is_positive_number, base_iterator>
FilterIter; FilterIter;
is_positive_number predicate; is_positive_number predicate;
@ -50,11 +52,11 @@ the integers greater than `-2`.
// Another example using make_filter_iterator() // Another example using make_filter_iterator()
std::copy( std::copy(
boost::make_filter_iterator( boost::make_filter_iterator(
std::bind(std::greater<int>(), std::placeholders::_1, -2) std::bind2nd(std::greater<int>(), -2)
, numbers, numbers + N) , numbers, numbers + N)
, boost::make_filter_iterator( , boost::make_filter_iterator(
std::bind(std::greater<int>(), std::placeholders::_1, -2) std::bind2nd(std::greater<int>(), -2)
, numbers + N, numbers + N) , numbers + N, numbers + N)
, std::ostream_iterator<int>(std::cout, " ") , std::ostream_iterator<int>(std::cout, " ")
@ -68,13 +70,12 @@ the integers greater than `-2`.
The output is: The output is:
[pre 4 5 8
4 5 8 4 5 8
4 5 8 0 -1 4 5 8
0 -1 4 5 8
]
The source code for this example can be found [example_link filter_iterator_example.cpp..here].
The source code for this example can be found [@../example/filter_iterator_example.cpp here].
[h2 Reference] [h2 Reference]
@ -113,10 +114,10 @@ The source code for this example can be found [example_link filter_iterator_exam
If `Iterator` models Readable Lvalue Iterator and Bidirectional Traversal If `Iterator` models Readable Lvalue Iterator and Bidirectional Traversal
Iterator then `iterator_category` is convertible to Iterator then `iterator_category` is convertible to
`std::bidirectional_iterator_tag`. `std::bidirectional_iterator_tag`.
Otherwise, if `Iterator` models Readable Lvalue Iterator and Forward Traversal Otherwise, if `Iterator` models Readable Lvalue Iterator and Forward Traversal
Iterator then `iterator_category` is convertible to Iterator then `iterator_category` is convertible to
`std::forward_iterator_tag`. `std::forward_iterator_tag`.
Otherwise `iterator_category` is Otherwise `iterator_category` is
convertible to `std::input_iterator_tag`. convertible to `std::input_iterator_tag`.
@ -163,7 +164,7 @@ following tables.
[[Writable Lvalue Iterator, Bidirectional Iterator ][Mutable Bidirectional Iterator]] [[Writable Lvalue Iterator, Bidirectional Iterator ][Mutable Bidirectional Iterator]]
] ]
`filter_iterator<P1, X>` is interoperable with `filter_iterator<P2, Y>` `filter_iterator<P1, X>` is interoperable with `filter_iterator<P2, Y>`
if and only if `X` is interoperable with `Y`. if and only if `X` is interoperable with `Y`.
@ -177,15 +178,15 @@ operations.
filter_iterator(); filter_iterator();
[*Requires: ]`Predicate` and `Iterator` must be Default Constructible.[br] [*Requires: ]`Predicate` and `Iterator` must be Default Constructible.\n
[*Effects: ] Constructs a `filter_iterator` whose`m_pred`, `m_iter`, and `m_end` [*Effects: ] Constructs a `filter_iterator` whose`m_pred`, `m_iter`, and `m_end`
members are a default constructed. members are a default constructed.
filter_iterator(Predicate f, Iterator x, Iterator end = Iterator()); filter_iterator(Predicate f, Iterator x, Iterator end = Iterator());
[*Effects: ] Constructs a `filter_iterator` where `m_iter` is either [*Effects: ] Constructs a `filter_iterator` where `m_iter` is either
the first position in the range `[x,end)` such that `f(*m_iter) == true` the first position in the range `[x,end)` such that `f(*m_iter) == true`
or else`m_iter == end`. The member `m_pred` is constructed from or else`m_iter == end`. The member `m_pred` is constructed from
`f` and `m_end` from `end`. `f` and `m_end` from `end`.
@ -194,9 +195,9 @@ operations.
filter_iterator(Iterator x, Iterator end = Iterator()); filter_iterator(Iterator x, Iterator end = Iterator());
[*Requires: ] `Predicate` must be Default Constructible and [*Requires: ] `Predicate` must be Default Constructible and
`Predicate` is a class type (not a function pointer).[br] `Predicate` is a class type (not a function pointer).\n
[*Effects: ] Constructs a `filter_iterator` where `m_iter` is either [*Effects: ] Constructs a `filter_iterator` where `m_iter` is either
the first position in the range `[x,end)` such that `m_pred(*m_iter) == true` the first position in the range `[x,end)` such that `m_pred(*m_iter) == true`
or else`m_iter == end`. The member `m_pred` is default constructed. or else`m_iter == end`. The member `m_pred` is default constructed.
@ -204,9 +205,9 @@ operations.
filter_iterator( filter_iterator(
filter_iterator<Predicate, OtherIterator> const& t filter_iterator<Predicate, OtherIterator> const& t
, typename enable_if_convertible<OtherIterator, Iterator>::type* = 0 // exposition , typename enable_if_convertible<OtherIterator, Iterator>::type* = 0 // exposition
); );`
[*Requires: ] `OtherIterator` is implicitly convertible to `Iterator`.[br] [*Requires: ] `OtherIterator` is implicitly convertible to `Iterator`.\n
[*Effects: ] Constructs a filter iterator whose members are copied from `t`. [*Effects: ] Constructs a filter iterator whose members are copied from `t`.
@ -234,7 +235,8 @@ operations.
[*Effects: ] Increments `m_iter` and then continues to [*Effects: ] Increments `m_iter` and then continues to
increment `m_iter` until either `m_iter == m_end` increment `m_iter` until either `m_iter == m_end`
or `m_pred(*m_iter) == true`.[br] or `m_pred(*m_iter) == true`.\n
[*Returns: ] `*this` [*Returns: ] `*this`
[endsect]
[endsect]

View File

@ -1,3 +1,4 @@
[section:function_output Function Output Iterator] [section:function_output Function Output Iterator]
The function output iterator adaptor makes it easier to create custom The function output iterator adaptor makes it easier to create custom
@ -33,8 +34,8 @@ proxy object.
x.push_back("!"); x.push_back("!");
std::string s = ""; std::string s = "";
std::copy(x.begin(), x.end(), std::copy(x.begin(), x.end(),
boost::make_function_output_iterator(string_appender(s))); boost::make_function_output_iterator(string_appender(s)));
std::cout << s << std::endl; std::cout << s << std::endl;
@ -67,7 +68,7 @@ proxy object.
[h3 Requirements] [h3 Requirements]
`UnaryFunction` must be Assignable and Copy Constructible. `UnaryFunction` must be Assignable and Copy Constructible.
[h3 Concepts] [h3 Concepts]
@ -78,14 +79,14 @@ Incrementable Iterator concepts.
explicit function_output_iterator(const UnaryFunction& f = UnaryFunction()); explicit function_output_iterator(const UnaryFunction& f = UnaryFunction());
[*Effects: ] Constructs an instance of `function_output_iterator` [*Effects: ] Constructs an instance of `function_output_iterator`
with `m_f` constructed from `f`. with `m_f` constructed from `f`.
unspecified_type operator*(); unspecified_type operator*();
[*Returns: ] An object `r` of unspecified type such that `r = t` [*Returns: ] An object `r` of unspecified type such that `r = t`
is equivalent to `m_f(t)` for all `t`. is equivalent to `m_f(t)` for all `t`.
function_output_iterator& operator++(); function_output_iterator& operator++();
@ -96,4 +97,4 @@ Incrementable Iterator concepts.
[*Returns: ] `*this`. [*Returns: ] `*this`.
[endsect] [endsect]

View File

@ -1,3 +1,4 @@
[section:indirect Indirect Iterator] [section:indirect Indirect Iterator]
`indirect_iterator` adapts an iterator by applying an `indirect_iterator` adapts an iterator by applying an
@ -49,31 +50,30 @@ using the `make_indirect_iterator` helper function.
const_indirect_last(pointers_to_chars + N); const_indirect_last(pointers_to_chars + N);
std::transform(const_indirect_first, const_indirect_last, std::transform(const_indirect_first, const_indirect_last,
mutable_indirect_first, std::bind(std::plus<char>(), 1, std::placeholders::_1)); mutable_indirect_first, std::bind1st(std::plus<char>(), 1));
std::copy(mutable_indirect_first, mutable_indirect_last, std::copy(mutable_indirect_first, mutable_indirect_last,
std::ostream_iterator<char>(std::cout, ",")); std::ostream_iterator<char>(std::cout, ","));
std::cout << std::endl; std::cout << std::endl;
// Example of using make_indirect_iterator() // Example of using make_indirect_iterator()
std::copy(boost::make_indirect_iterator(pointers_to_chars), std::copy(boost::make_indirect_iterator(pointers_to_chars),
boost::make_indirect_iterator(pointers_to_chars + N), boost::make_indirect_iterator(pointers_to_chars + N),
std::ostream_iterator<char>(std::cout, ",")); std::ostream_iterator<char>(std::cout, ","));
std::cout << std::endl; std::cout << std::endl;
The output is: The output is:
[pre a,b,c,d,e,f,g,
a,b,c,d,e,f,g, b,c,d,e,f,g,h,
b,c,d,e,f,g,h, a,b,c,d,e,f,g,
a,b,c,d,e,f,g,
]
The source code for this example can be found
[example_link indirect_iterator_example.cpp..here]. The source code for this example can be found
[@../example/indirect_iterator_example.cpp here].
[h2 Reference] [h2 Reference]
@ -137,9 +137,9 @@ the following pseudo-code, where `V` is
else else
typedef Reference reference; typedef Reference reference;
if (Value is use_default) then if (Value is use_default) then
typedef pointee<V>::type\* pointer; typedef pointee<V>::type\* pointer;
else else
typedef Value\* pointer; typedef Value\* pointer;
if (Difference is use_default) if (Difference is use_default)
@ -203,8 +203,8 @@ following operations:
indirect_iterator(); indirect_iterator();
[*Requires: ] `Iterator` must be Default Constructible.[br] [*Requires: ] `Iterator` must be Default Constructible.\n
[*Effects: ] Constructs an instance of `indirect_iterator` with [*Effects: ] Constructs an instance of `indirect_iterator` with
a default-constructed `m_iterator`. a default-constructed `m_iterator`.
@ -225,8 +225,8 @@ following operations:
, typename enable_if_convertible<Iterator2, Iterator>::type* = 0 // exposition , typename enable_if_convertible<Iterator2, Iterator>::type* = 0 // exposition
); );
[*Requires: ] `Iterator2` is implicitly convertible to `Iterator`.[br] [*Requires: ] `Iterator2` is implicitly convertible to `Iterator`.\n
[*Effects: ] Constructs an instance of `indirect_iterator` whose [*Effects: ] Constructs an instance of `indirect_iterator` whose
`m_iterator` subobject is constructed from `y.base()`. `m_iterator` subobject is constructed from `y.base()`.
@ -242,13 +242,13 @@ following operations:
indirect_iterator& operator++(); indirect_iterator& operator++();
[*Effects: ] `++m_iterator`[br] [*Effects: ] `++m_iterator`\n
[*Returns: ] `*this` [*Returns: ] `*this`
indirect_iterator& operator--(); indirect_iterator& operator--();
[*Effects: ] `--m_iterator`[br] [*Effects: ] `--m_iterator`\n
[*Returns: ] `*this` [*Returns: ] `*this`
[endsect] [endsect]

View File

@ -1,6 +1,6 @@
[library Boost.Iterator [library Boost.Iterator
[/ version 1.0.1] [/ version 1.0.1]
[quickbook 1.6]
[authors [Abrahams, David], [Siek, Jeremy], [Witt, Thomas]] [authors [Abrahams, David], [Siek, Jeremy], [Witt, Thomas]]
[copyright 2003 2005 David Abrahams Jeremy Siek Thomas Witt] [copyright 2003 2005 David Abrahams Jeremy Siek Thomas Witt]
[category iterator] [category iterator]
@ -28,11 +28,7 @@
[/ Links ] [/ Links ]
[def _iterator_ [@../../../iterator/doc/index.html Boost.Iterator]] [def _iterator_ [@../../libs/iterator/doc/index.html Boost.Iterator]]
[def _concept_check_ [@../../../concept_check/index.html Boost.ConceptCheck]]
[template example_link[name descr]'''<ulink url="../../example/'''[name]'''">'''[descr]'''</ulink>''']
[template sub[x]'''<subscript>'''[x]'''</subscript>''']
[section:intro Introduction] [section:intro Introduction]
@ -74,23 +70,19 @@ and a _GOTW_50_. New-style iterators go well beyond
patching up `vector<bool>`, though: there are lots of other patching up `vector<bool>`, though: there are lots of other
iterators already in use which can't be adequately represented by iterators already in use which can't be adequately represented by
the existing concepts. For details about the new iterator the existing concepts. For details about the new iterator
concepts, see our [@../new-iter-concepts.html Standard Proposal for New-Style Iterators]. concepts, see our [@./new-iter-concepts.html Standard Proposal for New-Style Iterators].
[h2 Iterator Facade and Adaptor] [h2 Iterator Facade and Adaptor]
[/ [def _facade_ [@./iterator_facade.html facade]]
[def _facade_ [link iterator.generic.facade facade]] [def _adaptor_ [@./iterator_adaptor.html adaptor]]
[def _adaptor_ [link iterator.generic.adaptor adaptor]]
]
[def _facade_ [@../iterator_facade.html facade]]
[def _adaptor_ [@../iterator_adaptor.html adaptor]]
Writing standard-conforming iterators is tricky, but the need comes Writing standard-conforming iterators is tricky, but the need comes
up often. In order to ease the implementation of new iterators, up often. In order to ease the implementation of new iterators,
the Boost.Iterator library provides the _facade_ class template, the Boost.Iterator library provides the _facade_ class template,
which implements many useful defaults and compile-time checks which implements many useful defaults and compile-time checks
designed to help the iterator author ensure that his iterator is designed to help the iterator author ensure that his iterator is
correct. correct.
It is also common to define a new iterator that is similar to some It is also common to define a new iterator that is similar to some
underlying iterator or iterator-like type, but that modifies some underlying iterator or iterator-like type, but that modifies some
@ -99,28 +91,26 @@ library supplies the _adaptor_ class template, which is specially
designed to take advantage of as much of the underlying type's designed to take advantage of as much of the underlying type's
behavior as possible. behavior as possible.
Both _facade_ and _adaptor_ as well as many of the [link iterator.specialized specialized Both _facade_ and _adaptor_ as well as many of the `specialized
adaptors] mentioned below have been proposed for standardization adaptors`_ mentioned below have been proposed for standardization
([@../facade-and-adaptor.html Standard Proposal For Iterator Facade and Adaptor]). ([@./facade-and-adaptor.html Standard Proposal For Iterator Facade and Adaptor]).
[h2 Specialized Adaptors] [h2 Specialized Adaptors]
The iterator library supplies a useful suite of standard-conforming The iterator library supplies a useful suite of standard-conforming
iterator templates based on the Boost [link iterator templates based on the Boost [link
iterator.intro.iterator_facade_and_adaptor iterator facade and adaptor] intro.iterator_facade_and_adaptor iterator facade and adaptor]
templates. templates.
[def _counting_ [link iterator.specialized.counting `counting_iterator`]] [def _counting_ [@./counting_iterator.html `counting_iterator`]]
[def _filter_ [link iterator.specialized.filter `filter_iterator`]] [def _filter_ [@./filter_iterator.html `filter_iterator`]]
[def _function_input_ [@../function_input_iterator.html `function_input_iterator`]] [def _function_ [@./function_output_iterator.html `function_output_iterator`]]
[def _function_output_ [link iterator.specialized.function_output `function_output_iterator`]] [def _indirect_ [@./indirect_iterator.html `indirect_iterator`]]
[def _generator_ [@../generator_iterator.htm `generator_iterator`]] [def _permutation_ [@./permutation_iterator.html `permutation_iterator`]]
[def _indirect_ [link iterator.specialized.indirect `indirect_iterator`]] [def _reverse_ [@./reverse_iterator.html `reverse_iterator`]]
[def _permutation_ [link iterator.specialized.permutation `permutation_iterator`]] [def _shared_ [@./shared_container_iterator.html `shared_container_iterator`]]
[def _reverse_ [link iterator.specialized.reverse `reverse_iterator`]] [def _transform_ [@./transform_iterator.html `transform_iterator`]]
[def _shared_ [link iterator.specialized.shared_container `shared_container_iterator`]] [def _zip_ [@./zip_iterator.html `zip_iterator`]]
[def _transform_ [link iterator.specialized.transform `transform_iterator`]]
[def _zip_ [link iterator.specialized.zip `zip_iterator`]]
[def _shared_ptr_ [@../../smart_ptr/shared_ptr.htm `shared_ptr`]] [def _shared_ptr_ [@../../smart_ptr/shared_ptr.htm `shared_ptr`]]
@ -130,18 +120,10 @@ templates.
* _filter_: an iterator over the subset of elements of some * _filter_: an iterator over the subset of elements of some
sequence which satisfy a given predicate sequence which satisfy a given predicate
* _function_input_: an input iterator wrapping a generator (nullary * _function_: an output iterator wrapping a unary function
function object); each time the iterator is dereferenced, the function object
is called to get the value to return.
* _function_output_: an output iterator wrapping a unary function
object; each time an element is written into the dereferenced object; each time an element is written into the dereferenced
iterator, it is passed as a parameter to the function object. iterator, it is passed as a parameter to the function object.
* _generator_: an input iterator wrapping a generator (nullary
function object); each time the iterator is dereferenced, the function object
is called to get the value to return. An outdated analogue of _function_input_.
* _indirect_: an iterator over the objects *pointed-to* by the * _indirect_: an iterator over the objects *pointed-to* by the
elements of some sequence. elements of some sequence.
@ -150,7 +132,7 @@ templates.
* _reverse_: an iterator which traverses the elements of some * _reverse_: an iterator which traverses the elements of some
bidirectional sequence in reverse. Corrects many of the bidirectional sequence in reverse. Corrects many of the
shortcomings of C++98's `std::reverse_iterator`. shortcomings of C++98's ``std::reverse_iterator``.
* _shared_: an iterator over elements of a container whose * _shared_: an iterator over elements of a container whose
lifetime is maintained by a _shared_ptr_ stored in the iterator. lifetime is maintained by a _shared_ptr_ stored in the iterator.
@ -158,7 +140,7 @@ templates.
* _transform_: an iterator over elements which are the result of * _transform_: an iterator over elements which are the result of
applying some functional transformation to the elements of an applying some functional transformation to the elements of an
underlying sequence. This component also replaces the old underlying sequence. This component also replaces the old
`projection_iterator_adaptor`. ``projection_iterator_adaptor``.
* _zip_: an iterator over tuples of the elements at corresponding * _zip_: an iterator over tuples of the elements at corresponding
positions of heterogeneous underlying iterators. positions of heterogeneous underlying iterators.
@ -167,9 +149,9 @@ templates.
[h3 Traits] [h3 Traits]
[def _pointee_ [link iterator.utilities.traits `pointee.hpp`]] [def _pointee_ [@./pointee.html `pointee.hpp`]]
[def _iterator_traits_ [link iterator.utilities.iterator_traits `iterator_traits.hpp`]] [def _iterator_traits_ [@./iterator_traits.html `iterator_traits.hpp`]]
[def _interoperable_ [@../interoperable.html `interoperable.hpp`]] [def _interoperable_ [@./interoperable.html `interoperable.hpp`]]
[def _MPL_ [@../../mpl/doc/index.html [*MPL]]] [def _MPL_ [@../../mpl/doc/index.html [*MPL]]]
* _pointee_: Provides the capability to deduce the referent types * _pointee_: Provides the capability to deduce the referent types
@ -180,40 +162,19 @@ templates.
retrieve an iterator's traits. Also corrects for the deficiencies retrieve an iterator's traits. Also corrects for the deficiencies
of broken implementations of `std::iterator_traits`. of broken implementations of `std::iterator_traits`.
[/ [\ * |interoperable|_ (PDF__): Provides an _MPL_ compatible metafunction for
* _interoperable_: Provides an _MPL_ compatible metafunction for testing iterator interoperability
testing iterator interoperability
] ]
[h3 Testing and Concept Checking] [h3 Testing and Concept Checking]
[def _iterator_concepts_ [link iterator.concepts `iterator_concepts.hpp`]] [def _iterator_concepts_ [@./iterator_concepts.html `iterator_concepts.hpp`]]
[def _iterator_archetypes_ [link iterator.utilities.archetypes `iterator_archetypes.hpp`]] [def _iterator_archetypes_ [@./iterator_archetypes.html `iterator_archetypes.hpp`]]
* _iterator_concepts_: Concept checking classes for the new iterator concepts. * _iterator_concepts_: Concept checking classes for the new iterator concepts.
* _iterator_archetypes_: Concept archetype classes for the new iterators concepts. * _iterator_archetypes_: Concept archetype classes for the new iterators concepts.
[h2 Iterator Algorithms]
The library provides a number of generic algorithms for use with iterators. These
algorithms take advantage of the new concepts defined by the library to provide
better performance and functionality.
[def _advance_ [link iterator.algorithms.advance `advance.hpp`]]
[def _distance_ [link iterator.algorithms.distance `distance.hpp`]]
[def _next_prior_ [link iterator.algorithms.next_prior `next_prior.hpp`]]
* _advance_: Provides `advance()` function for advancing an iterator a given number
of positions forward or backward.
* _distance_: Provides `distance()` function for computing distance between two
iterators.
* _next_prior_: Provides `next()` and `prior()` functions for obtaining
next and prior iterators to a given iterator. The functions are also compatible
with non-iterator types.
[endsect] [endsect]
[include concepts.qbk] [include concepts.qbk]
@ -234,14 +195,12 @@ better performance and functionality.
[include concept_checking.qbk] [include concept_checking.qbk]
[include iterator_traits.qbk] [include traits.qbk]
[include type_traits.qbk] [include utilities.qbk]
[endsect] [endsect]
[include algorithms.qbk]
[section:upgrading Upgrading from the old Boost Iterator Adaptor Library] [section:upgrading Upgrading from the old Boost Iterator Adaptor Library]
[def _type_generator_ [@http://www.boost.org/more/generic_programming.html#type_generator type generator]] [def _type_generator_ [@http://www.boost.org/more/generic_programming.html#type_generator type generator]]
@ -305,3 +264,5 @@ library you see today.
Patterns, C++ Report, February 1995, pp. 24-27.] Patterns, C++ Report, February 1995, pp. 24-27.]
[endsect] [endsect]

View File

@ -1,54 +0,0 @@
[section:iterator_traits Iterator Traits]
`std::iterator_traits` provides access to five associated types
of any iterator: its `value_type`, `reference`, `pointer`,
`iterator_category`, and `difference_type`. Unfortunately,
such a "multi-valued" traits template can be difficult to use in a
metaprogramming context. `<boost/iterator/iterator_traits.hpp>`
provides access to these types using a standard metafunctions_.
[h2 Synopsis]
Header `<boost/iterator/iterator_traits.hpp>`:
template <class Iterator>
struct iterator_value
{
typedef typename
std::iterator_traits<Iterator>::value_type
type;
};
template <class Iterator>
struct iterator_reference
{
typedef typename
std::iterator_traits<Iterator>::reference
type;
};
template <class Iterator>
struct iterator_pointer
{
typedef typename
std::iterator_traits<Iterator>::pointer
type;
};
template <class Iterator>
struct iterator_difference
{
typedef typename
detail::iterator_traits<Iterator>::difference_type
type;
};
template <class Iterator>
struct iterator_category
{
typedef typename
detail::iterator_traits<Iterator>::iterator_category
type;
};
[endsect]

View File

@ -1,3 +1,4 @@
[section:permutation Permutation Iterator] [section:permutation Permutation Iterator]
The permutation iterator adaptor provides a permuted view of a given The permutation iterator adaptor provides a permuted view of a given
@ -34,7 +35,7 @@ past-the-end iterator to the indices.
*el_it = std::distance(elements.begin(), el_it); *el_it = std::distance(elements.begin(), el_it);
index_type indices( index_size ); index_type indices( index_size );
for(index_type::iterator i_it = indices.begin() ; i_it != indices.end() ; ++i_it ) for(index_type::iterator i_it = indices.begin() ; i_it != indices.end() ; ++i_it )
*i_it = element_range_size - index_size + std::distance(indices.begin(), i_it); *i_it = element_range_size - index_size + std::distance(indices.begin(), i_it);
std::reverse( indices.begin(), indices.end() ); std::reverse( indices.begin(), indices.end() );
@ -74,28 +75,27 @@ past-the-end iterator to the indices.
The output is: The output is:
[pre The original range is : 0 1 2 3 4 5 6 7 8 9
The original range is : 0 1 2 3 4 5 6 7 8 9 The reindexing scheme is : 9 8 7 6
The reindexing scheme is : 9 8 7 6 The permutated range is : 9 8 7 6
The permutated range is : 9 8 7 6 Elements at even indices in the permutation : 9 7
Elements at even indices in the permutation : 9 7 Permutation backwards : 6 7 8 9
Permutation backwards : 6 7 8 9 Iterate backward with stride 2 : 6 8
Iterate backward with stride 2 : 6 8
]
The source code for this example can be found The source code for this example can be found
[example_link permutation_iter_example.cpp..here]. [@../example/permutation_iter_example.cpp here].
[h2 Reference] [h2 Reference]
[h3 Synopsis] [h3 Synopsis]
template< class ElementIterator template< class ElementIterator
, class IndexIterator , class IndexIterator
, class ValueT = use_default , class ValueT = use_default
, class CategoryT = use_default , class CategoryT = use_default
, class ReferenceT = use_default , class ReferenceT = use_default
, class DifferenceT = use_default > , class DifferenceT = use_default >
class permutation_iterator class permutation_iterator
{ {
public: public:
@ -104,10 +104,10 @@ The source code for this example can be found
template< class OEIter, class OIIter, class V, class C, class R, class D > template< class OEIter, class OIIter, class V, class C, class R, class D >
permutation_iterator( permutation_iterator(
permutation_iterator<OEIter, OIIter, V, C, R, D> const& r permutation_iterator<OEIter, OIIter, V, C, R, D> const& r
, typename enable_if_convertible<OEIter, ElementIterator>::type* = 0 , typename enable_if_convertible<OEIter, ElementIterator>::type* = 0
, typename enable_if_convertible<OIIter, IndexIterator>::type* = 0 , typename enable_if_convertible<OIIter, IndexIterator>::type* = 0
); );
reference operator*() const; reference operator*() const;
permutation_iterator& operator++(); permutation_iterator& operator++();
ElementIterator const& base() const; ElementIterator const& base() const;
@ -117,7 +117,7 @@ The source code for this example can be found
}; };
template <class ElementIterator, class IndexIterator> template <class ElementIterator, class IndexIterator>
permutation_iterator<ElementIterator, IndexIterator> permutation_iterator<ElementIterator, IndexIterator>
make_permutation_iterator( ElementIterator e, IndexIterator i); make_permutation_iterator( ElementIterator e, IndexIterator i);
@ -134,15 +134,15 @@ the `IndexIterator` must be convertible to the difference type of
as `IndexIterator` and the same iterator access concepts as as `IndexIterator` and the same iterator access concepts as
`ElementIterator`. `ElementIterator`.
If `IndexIterator` models Single Pass Iterator and If `IndexIterator` models Single Pass Iterator and
`ElementIterator` models Readable Iterator then `ElementIterator` models Readable Iterator then
`permutation_iterator` models Input Iterator. `permutation_iterator` models Input Iterator.
If `IndexIterator` models Forward Traversal Iterator and If `IndexIterator` models Forward Traversal Iterator and
`ElementIterator` models Readable Lvalue Iterator then `ElementIterator` models Readable Lvalue Iterator then
`permutation_iterator` models Forward Iterator. `permutation_iterator` models Forward Iterator.
If `IndexIterator` models Bidirectional Traversal Iterator and If `IndexIterator` models Bidirectional Traversal Iterator and
`ElementIterator` models Readable Lvalue Iterator then `ElementIterator` models Readable Lvalue Iterator then
`permutation_iterator` models Bidirectional Iterator. `permutation_iterator` models Bidirectional Iterator.
@ -173,10 +173,10 @@ following operations.
template< class OEIter, class OIIter, class V, class C, class R, class D > template< class OEIter, class OIIter, class V, class C, class R, class D >
permutation_iterator( permutation_iterator(
permutation_iterator<OEIter, OIIter, V, C, R, D> const& r permutation_iterator<OEIter, OIIter, V, C, R, D> const& r
, typename enable_if_convertible<OEIter, ElementIterator>::type* = 0 , typename enable_if_convertible<OEIter, ElementIterator>::type* = 0
, typename enable_if_convertible<OIIter, IndexIterator>::type* = 0 , typename enable_if_convertible<OIIter, IndexIterator>::type* = 0
); );
[*Effects: ] Constructs `m_elt` from `r.m_elt` and [*Effects: ] Constructs `m_elt` from `r.m_elt` and
`m_order` from `y.m_order`. `m_order` from `y.m_order`.
@ -189,7 +189,7 @@ following operations.
permutation_iterator& operator++(); permutation_iterator& operator++();
[*Effects: ] `++m_order`[br] [*Effects: ] `++m_order`\n
[*Returns: ] `*this` [*Returns: ] `*this`
@ -199,9 +199,9 @@ following operations.
template <class ElementIterator, class IndexIterator> template <class ElementIterator, class IndexIterator>
permutation_iterator<ElementIterator, IndexIterator> permutation_iterator<ElementIterator, IndexIterator>
make_permutation_iterator(ElementIterator e, IndexIterator i); make_permutation_iterator(ElementIterator e, IndexIterator i);
[*Returns: ] `permutation_iterator<ElementIterator, IndexIterator>(e, i)` [*Returns: ] `permutation_iterator<ElementIterator, IndexIterator>(e, i)`
[endsect] [endsect]

View File

@ -1,3 +1,4 @@
[section:reverse Reverse Iterator] [section:reverse Reverse Iterator]
The reverse iterator adaptor iterates through the adapted iterator The reverse iterator adaptor iterates through the adapted iterator
@ -8,6 +9,7 @@ range in the opposite direction.
The following example prints an array of characters in reverse order The following example prints an array of characters in reverse order
using `reverse_iterator`. using `reverse_iterator`.
char letters_[] = "hello world!"; char letters_[] = "hello world!";
const int N = sizeof(letters_)/sizeof(char) - 1; const int N = sizeof(letters_)/sizeof(char) - 1;
typedef char* base_iterator; typedef char* base_iterator;
@ -33,14 +35,13 @@ using `reverse_iterator`.
The output is: The output is:
[pre original sequence of letters: hello world!
original sequence of letters: hello world! sequence in reverse order: !dlrow olleh
sequence in reverse order: !dlrow olleh sequence in double-reversed (normal) order: hello world!
sequence in double-reversed (normal) order: hello world!
]
The source code for this example can be found The source code for this example can be found
[example_link reverse_iterator_example.cpp..here]. [@../example/reverse_iterator_example.cpp here].
[h2 Reference] [h2 Reference]
@ -114,8 +115,8 @@ operations.
reverse_iterator(); reverse_iterator();
[*Requires: ] `Iterator` must be Default Constructible.[br] [*Requires: ] `Iterator` must be Default Constructible.\n
[*Effects: ] Constructs an instance of `reverse_iterator` with `m_iterator` [*Effects: ] Constructs an instance of `reverse_iterator` with `m_iterator`
default constructed. default constructed.
explicit reverse_iterator(Iterator x); explicit reverse_iterator(Iterator x);
@ -130,8 +131,8 @@ operations.
, typename enable_if_convertible<OtherIterator, Iterator>::type* = 0 // exposition , typename enable_if_convertible<OtherIterator, Iterator>::type* = 0 // exposition
); );
[*Requires: ] `OtherIterator` is implicitly convertible to `Iterator`.[br] [*Requires: ] `OtherIterator` is implicitly convertible to `Iterator`.\n
[*Effects: ] Constructs instance of `reverse_iterator` whose [*Effects: ] Constructs instance of `reverse_iterator` whose
`m_iterator` subobject is constructed from `y.base()`. `m_iterator` subobject is constructed from `y.base()`.
@ -148,12 +149,12 @@ operations.
reverse_iterator& operator++(); reverse_iterator& operator++();
[*Effects: ] `--m_iterator`[br] [*Effects: ] `--m_iterator`\n
[*Returns: ] `*this` [*Returns: ] `*this`
reverse_iterator& operator--(); reverse_iterator& operator--();
[*Effects: ] `++m_iterator`[br] [*Effects: ] `++m_iterator`\n
[*Returns: ] `*this` [*Returns: ] `*this`
[endsect] [endsect]

View File

@ -1,6 +1,7 @@
[section:shared_container Shared Container Iterator] [section:shared_container Shared Container Iterator]
Defined in header [@../../../boost/iterator/shared_container_iterator.hpp `boost/iterator/shared_container_iterator.hpp`]. Defined in header [@../../../boost/shared_container_iterator.hpp `boost/shared_container_iterator.hpp`].
The purpose of the shared container iterator is to attach the lifetime The purpose of the shared container iterator is to attach the lifetime
of a container to the lifetime of its iterators. In other words, the of a container to the lifetime of its iterators. In other words, the
@ -24,42 +25,20 @@ iterator.
[h2 Synopsis] [h2 Synopsis]
namespace boost { namespace boost {
namespace iterators {
template <typename Container> template <typename Container>
class shared_container_iterator; class shared_container_iterator;
template <typename Container> template <typename Container>
shared_container_iterator<Container> shared_container_iterator<Container>
make_shared_container_iterator(typename Container::iterator base, make_shared_container_iterator(typename Container::iterator base,
std::shared_ptr<Container> const& container);
std::pair<
typename shared_container_iterator<Container>,
typename shared_container_iterator<Container>
>
make_shared_container_range(std::shared_ptr<Container> const& container);
// Backward compatibility with boost::shared_ptr
template <typename Container>
shared_container_iterator<Container>
make_shared_container_iterator(typename Container::iterator base,
boost::shared_ptr<Container> const& container); boost::shared_ptr<Container> const& container);
std::pair< std::pair<
typename shared_container_iterator<Container>, typename shared_container_iterator<Container>,
typename shared_container_iterator<Container> typename shared_container_iterator<Container>
> >
make_shared_container_range(boost::shared_ptr<Container> const& container); make_shared_container_range(boost::shared_ptr<Container> const& container);
} }
}
[note `shared_container_iterator` and its factory functions support both
`std::shared_ptr` and `boost::shared_ptr` for a smart pointer that holds
a shared reference to the container. However, the support for `boost::shared_ptr`
comes at a cost of wrapping it in a `std::shared_ptr` internally. This means
that when constructing the iterator from a `boost::shared_ptr`, the construction
will have to allocate memory for `std::shared_ptr` shared state, which may
potentially fail. It is recommended to use `std::shared_ptr` directly.]
[section:shared_container_type The Shared Container Iterator Type] [section:shared_container_type The Shared Container Iterator Type]
@ -67,7 +46,7 @@ potentially fail. It is recommended to use `std::shared_ptr` directly.]
The class template `shared_container_iterator` is the shared container The class template `shared_container_iterator` is the shared container
iterator type. The `Container` template type argument must model the iterator type. The `Container` template type argument must model the
[@http://www.sgi.com/tech/stl/Container.html Container] concept. [@http://www.sgi.com/tech/stl/Container.html Container] concept.
[h2 Example] [h2 Example]
@ -77,48 +56,48 @@ original shared pointer `ints` ceases to exist after `set_range()`
returns, the `shared_counter_iterator` objects maintain references to returns, the `shared_counter_iterator` objects maintain references to
the underlying vector and thereby extend the container's lifetime. the underlying vector and thereby extend the container's lifetime.
[example_link shared_iterator_example1.cpp..`shared_iterator_example1.cpp`]: [@../../../libs/utility/shared_iterator_example1.cpp `shared_iterator_example1.cpp`]:
#include <boost/iterator/shared_container_iterator.hpp> #include "shared_container_iterator.hpp"
#include "boost/shared_ptr.hpp"
#include <algorithm> #include <algorithm>
#include <iostream> #include <iostream>
#include <vector> #include <vector>
#include <memory>
typedef boost::shared_container_iterator< std::vector<int> > iterator;
using iterator = boost::iterators::shared_container_iterator< std::vector<int> >;
void set_range(iterator& i, iterator& end) {
void set_range(iterator& i, iterator& end) {
std::shared_ptr< std::vector<int> > ints(new std::vector<int>()); boost::shared_ptr< std::vector<int> > ints(new std::vector<int>());
ints->push_back(0); ints->push_back(0);
ints->push_back(1); ints->push_back(1);
ints->push_back(2); ints->push_back(2);
ints->push_back(3); ints->push_back(3);
ints->push_back(4); ints->push_back(4);
ints->push_back(5); ints->push_back(5);
i = iterator(ints->begin(), ints); i = iterator(ints->begin(),ints);
end = iterator(ints->end(), ints); end = iterator(ints->end(),ints);
} }
int main() { int main() {
iterator i, end;
iterator i,end;
set_range(i, end);
set_range(i,end);
std::copy(i, end, std::ostream_iterator<int>(std::cout, ","));
std::copy(i,end,std::ostream_iterator<int>(std::cout,","));
std::cout.put('\n'); std::cout.put('\n');
return 0; return 0;
} }
The output from this part is: The output from this part is:
[pre 0,1,2,3,4,5,
0,1,2,3,4,5,
]
[table Template Parameters [table Template Parameters
[[Parameter][Description]] [[Parameter][Description]]
@ -136,12 +115,8 @@ The `shared_container_iterator` type implements the member functions
and operators required of the and operators required of the
[@http://www.sgi.com/tech/stl/RandomAccessIterator.html Random Access [@http://www.sgi.com/tech/stl/RandomAccessIterator.html Random Access
Iterator] concept, though only operations defined for the base Iterator] concept, though only operations defined for the base
iterator will be valid. In addition it has the following constructors: iterator will be valid. In addition it has the following constructor:
shared_container_iterator(Container::iterator const& it,
std::shared_ptr<Container> const& container)
// Backward compatibility with boost::shared_ptr
shared_container_iterator(Container::iterator const& it, shared_container_iterator(Container::iterator const& it,
boost::shared_ptr<Container> const& container) boost::shared_ptr<Container> const& container)
@ -149,60 +124,58 @@ iterator will be valid. In addition it has the following constructors:
[section:shared_container_object_generator The Shared Container Iterator Object Generator] [section:shared_container_object_generator The Shared Container Iterator Object Generator]
template <typename Container>
shared_container_iterator<Container>
make_shared_container_iterator(Container::iterator base,
std::shared_ptr<Container> const& container)
// Backward compatibility with boost::shared_ptr
template <typename Container> template <typename Container>
shared_container_iterator<Container> shared_container_iterator<Container>
make_shared_container_iterator(Container::iterator base, make_shared_container_iterator(Container::iterator base,
boost::shared_ptr<Container> const& container) boost::shared_ptr<Container> const& container)
This function provides an alternative to directly constructing a This function provides an alternative to directly constructing a
`shared_container_iterator`. Using the object generator, a `shared_container_iterator`. Using the object generator, a
`shared_container_iterator` can be created and passed to a function without `shared_container_iterator` can be created and passed to a function without
explicitly specifying its type. explicitly specifying its type.
[h2 Example] [h2 Example]
This example, similar to the previous, This example, similar to the previous,
uses `make_shared_container_iterator()` to create the iterators. uses `make_shared_container_iterator()` to create the iterators.
[example_link shared_iterator_example2.cpp..`shared_iterator_example2.cpp`]: [@../../../libs/utility/shared_iterator_example2.cpp `shared_iterator_example2.cpp`]:
#include <boost/iterator/shared_container_iterator.hpp> #include "shared_container_iterator.hpp"
#include "boost/shared_ptr.hpp"
#include <algorithm> #include <algorithm>
#include <iterator> #include <iterator>
#include <iostream> #include <iostream>
#include <vector> #include <vector>
#include <memory>
template <typename Iterator> template <typename Iterator>
void print_range_nl(Iterator begin, Iterator end) { void print_range_nl (Iterator begin, Iterator end) {
using val = typename std::iterator_traits<Iterator>::value_type; typedef typename std::iterator_traits<Iterator>::value_type val;
std::copy(begin, end, std::ostream_iterator<val>(std::cout, ",")); std::copy(begin,end,std::ostream_iterator<val>(std::cout,","));
std::cout.put('\n'); std::cout.put('\n');
} }
int main() { int main() {
using ints_t = std::shared_ptr< std::vector<int> >;
typedef boost::shared_ptr< std::vector<int> > ints_t;
{ {
ints_t ints(new std::vector<int>()); ints_t ints(new std::vector<int>());
ints->push_back(0); ints->push_back(0);
ints->push_back(1); ints->push_back(1);
ints->push_back(2); ints->push_back(2);
ints->push_back(3); ints->push_back(3);
ints->push_back(4); ints->push_back(4);
ints->push_back(5); ints->push_back(5);
print_range_nl(boost::iterators::make_shared_container_iterator(ints->begin(), ints), print_range_nl(boost::make_shared_container_iterator(ints->begin(),ints),
boost::iterators::make_shared_container_iterator(ints->end(), ints)); boost::make_shared_container_iterator(ints->end(),ints));
} }
return 0; return 0;
} }
@ -213,63 +186,55 @@ named. The output from this example is the same as the previous.
[section:shared_container_generator The Shared Container Iterator Range Generator] [section:shared_container_generator The Shared Container Iterator Range Generator]
template <typename Container>
std::pair<
shared_container_iterator<Container>,
shared_container_iterator<Container>
>
make_shared_container_range(std::shared_ptr<Container> const& container);
// Backward compatibility with boost::shared_ptr
template <typename Container> template <typename Container>
std::pair< std::pair<
shared_container_iterator<Container>, shared_container_iterator<Container>,
shared_container_iterator<Container> shared_container_iterator<Container>
> >
make_shared_container_range(boost::shared_ptr<Container> const& container); make_shared_container_range(boost::shared_ptr<Container> const& container);
Class shared_container_iterator is meant primarily to return, using iterators, a range of values that we can guarantee will be alive as long as the iterators are. This is a convenience function to do just that. It is equivalent to
Class `shared_container_iterator` is meant primarily to return, using iterators, std::make_pair(make_shared_container_iterator(container->begin(),container),
a range of values that we can guarantee will be alive as long as the iterators are. make_shared_container_iterator(container->end(),container));
This is a convenience function to do just that. It is functionally equivalent to this:
std::make_pair(make_shared_container_iterator(container->begin(), container),
make_shared_container_iterator(container->end(), container));
[h2 Example] [h2 Example]
In the following example, a range of values is returned as a pair of `shared_container_iterator` objects. In the following example, a range of values is returned as a pair of shared_container_iterator objects.
[example_link shared_iterator_example3.cpp..`shared_iterator_example3.cpp`]: [@../../../libs/utility/shared_iterator_example3.cpp `shared_iterator_example3.cpp`]:
#include <boost/iterator/shared_container_iterator.hpp> #include "shared_container_iterator.hpp"
#include <algorithm> // for std::copy #include "boost/shared_ptr.hpp"
#include <iostream> #include "boost/tuple/tuple.hpp" // for boost::tie
#include <algorithm> // for std::copy
#include <iostream>
#include <vector> #include <vector>
#include <memory>
#include <tuple> // for std::tie
typedef boost::shared_container_iterator< std::vector<int> > iterator;
using iterator = boost::iterators::shared_container_iterator< std::vector<int> >; std::pair<iterator,iterator>
std::pair<iterator, iterator>
return_range() { return_range() {
std::shared_ptr< std::vector<int> > range(new std::vector<int>()); boost::shared_ptr< std::vector<int> > range(new std::vector<int>());
range->push_back(0); range->push_back(0);
range->push_back(1); range->push_back(1);
range->push_back(2); range->push_back(2);
range->push_back(3); range->push_back(3);
range->push_back(4); range->push_back(4);
range->push_back(5); range->push_back(5);
return boost::iterators::make_shared_container_range(range); return boost::make_shared_container_range(range);
} }
int main() { int main() {
iterator i,end; iterator i,end;
std::tie(i, end) = return_range();
boost::tie(i,end) = return_range();
std::copy(i, end, std::ostream_iterator<int>(std::cout, ","));
std::copy(i,end,std::ostream_iterator<int>(std::cout,","));
std::cout.put('\n'); std::cout.put('\n');
return 0; return 0;
} }
@ -280,4 +245,4 @@ the same as the previous two.
[endsect] [endsect]
[endsect] [endsect]

View File

@ -1,3 +1,4 @@
[section:specialized Specialized Adaptors] [section:specialized Specialized Adaptors]
[include ./counting_iterator.qbk] [include ./counting_iterator.qbk]
@ -18,4 +19,4 @@
[include ./zip_iterator.qbk] [include ./zip_iterator.qbk]
[endsect] [endsect]

72
doc/quickbook/traits.qbk Normal file
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@ -0,0 +1,72 @@
[section:traits Iterator Traits]
`std::iterator_traits` provides access to five associated types
of any iterator: its `value_type`, `reference`, `pointer`,
`iterator_category`, and `difference_type`. Unfortunately,
such a "multi-valued" traits template can be difficult to use in a
metaprogramming context. `<boost/iterator/iterator_traits.hpp>`
provides access to these types using a standard metafunctions_.
[h2 Synopsis]
Header `<boost/iterator/iterator_traits.hpp>`:
template <class Iterator>
struct iterator_value
{
typedef typename
std::iterator_traits<Iterator>::value_type
type;
};
template <class Iterator>
struct iterator_reference
{
typedef typename
std::iterator_traits<Iterator>::reference
type;
};
template <class Iterator>
struct iterator_pointer
{
typedef typename
std::iterator_traits<Iterator>::pointer
type;
};
template <class Iterator>
struct iterator_difference
{
typedef typename
detail::iterator_traits<Iterator>::difference_type
type;
};
template <class Iterator>
struct iterator_category
{
typedef typename
detail::iterator_traits<Iterator>::iterator_category
type;
};
[h2 Broken Compiler Notes]
Because of workarounds in Boost, you may find that these
[@../../mpl/doc/index.html#metafunctions metafunctions] actually work better than the facilities provided by
your compiler's standard library.
On compilers that don't support partial specialization, such as
Microsoft Visual C++ 6.0 or 7.0, you may need to manually invoke
[@../../type_traits/index.html#transformations BOOST_BROKEN_COMPILER_TYPE_TRAITS_SPECIALIZATION] on the
`value_type` of pointers that are passed to these metafunctions.
Because of bugs in the implementation of GCC-2.9x, the name of
`iterator_category` is changed to `iterator_category_` on that
compiler. A macro, `BOOST_ITERATOR_CATEGORY`, that expands to
either `iterator_category` or `iterator_category_`, as
appropriate to the platform, is provided for portability.
[endsect]

View File

@ -1,3 +1,4 @@
[section:transform Transform Iterator] [section:transform Transform Iterator]
The transform iterator adapts an iterator by modifying the The transform iterator adapts an iterator by modifying the
@ -13,38 +14,37 @@ generate iterators that multiply (or add to) the value returned by
dereferencing the iterator. It would be cooler to use lambda library dereferencing the iterator. It would be cooler to use lambda library
in this example. in this example.
int x[] = { 1, 2, 3, 4, 5, 6, 7, 8 }; int x[] = { 1, 2, 3, 4, 5, 6, 7, 8 };
const int N = sizeof(x)/sizeof(int); const int N = sizeof(x)/sizeof(int);
typedef boost::binder1st< std::multiplies<int> > Function; typedef boost::binder1st< std::multiplies<int> > Function;
typedef boost::transform_iterator<Function, int*> doubling_iterator; typedef boost::transform_iterator<Function, int*> doubling_iterator;
doubling_iterator i(x, boost::bind1st(std::multiplies<int>(), 2)), doubling_iterator i(x, boost::bind1st(std::multiplies<int>(), 2)),
i_end(x + N, boost::bind1st(std::multiplies<int>(), 2)); i_end(x + N, boost::bind1st(std::multiplies<int>(), 2));
std::cout << "multiplying the array by 2:" << std::endl; std::cout << "multiplying the array by 2:" << std::endl;
while (i != i_end) while (i != i_end)
std::cout << *i++ << " "; std::cout << *i++ << " ";
std::cout << std::endl; std::cout << std::endl;
std::cout << "adding 4 to each element in the array:" << std::endl; std::cout << "adding 4 to each element in the array:" << std::endl;
std::copy(boost::make_transform_iterator(x, boost::bind1st(std::plus<int>(), 4)), std::copy(boost::make_transform_iterator(x, boost::bind1st(std::plus<int>(), 4)),
boost::make_transform_iterator(x + N, boost::bind1st(std::plus<int>(), 4)), boost::make_transform_iterator(x + N, boost::bind1st(std::plus<int>(), 4)),
std::ostream_iterator<int>(std::cout, " ")); std::ostream_iterator<int>(std::cout, " "));
std::cout << std::endl; std::cout << std::endl;
The output is: The output is:
[pre multiplying the array by 2:
multiplying the array by 2: 2 4 6 8 10 12 14 16
2 4 6 8 10 12 14 16 adding 4 to each element in the array:
adding 4 to each element in the array: 5 6 7 8 9 10 11 12
5 6 7 8 9 10 11 12
]
The source code for this example can be found
[example_link transform_iterator_example.cpp..here]. The source code for this example can be found
[@../example/transform_iterator_example.cpp here].
[h2 Reference] [h2 Reference]
@ -52,8 +52,8 @@ The source code for this example can be found
[h3 Synopsis] [h3 Synopsis]
template <class UnaryFunction, template <class UnaryFunction,
class Iterator, class Iterator,
class Reference = use_default, class Reference = use_default,
class Value = use_default> class Value = use_default>
class transform_iterator class transform_iterator
{ {
@ -85,8 +85,8 @@ The source code for this example can be found
If `Reference` is `use_default` then the `reference` member of If `Reference` is `use_default` then the `reference` member of
`transform_iterator` is[br] `transform_iterator` is\n
`result_of<const UnaryFunction(iterator_traits<Iterator>::reference)>::type`. `result_of<UnaryFunction(iterator_traits<Iterator>::reference)>::type`.
Otherwise, `reference` is `Reference`. Otherwise, `reference` is `Reference`.
@ -110,13 +110,13 @@ convertible to `input_iterator_tag`.
The type `UnaryFunction` must be Assignable, Copy Constructible, and The type `UnaryFunction` must be Assignable, Copy Constructible, and
the expression `f(*i)` must be valid where `f` is a const object of the expression `f(*i)` must be valid where `f` is an object of
type `UnaryFunction`, `i` is an object of type `Iterator`, and type `UnaryFunction`, `i` is an object of type `Iterator`, and
where the type of `f(*i)` must be where the type of `f(*i)` must be
`result_of<const UnaryFunction(iterator_traits<Iterator>::reference)>::type`. `result_of<UnaryFunction(iterator_traits<Iterator>::reference)>::type`.
The argument `Iterator` shall model Readable Iterator. The argument `Iterator` shall model Readable Iterator.
[h3 Concepts] [h3 Concepts]
@ -126,11 +126,11 @@ The resulting `transform_iterator` models the most refined of the
following that is also modeled by `Iterator`. following that is also modeled by `Iterator`.
* Writable Lvalue Iterator if `transform_iterator::reference` is a non-const reference. * Writable Lvalue Iterator if `transform_iterator::reference` is a non-const reference.
* Readable Lvalue Iterator if `transform_iterator::reference` is a const reference. * Readable Lvalue Iterator if `transform_iterator::reference` is a const reference.
* Readable Iterator otherwise. * Readable Iterator otherwise.
The `transform_iterator` models the most refined standard traversal The `transform_iterator` models the most refined standard traversal
@ -143,11 +143,11 @@ the `Iterator` argument models.
[table Category [table Category
[[If `Iterator` models][then `transform_iterator` models]] [[If `Iterator` models][then `transform_iterator` models]]
[[Single Pass Iterator][Input Iterator]] [[Single Pass Iterator][Input Iterator]]
[[Forward Traversal Iterator][Forward Iterator]] [[Forward Traversal Iterator][Forward Iterator]]
[[Bidirectional Traversal Iterator][Bidirectional Iterator]] [[Bidirectional Traversal Iterator][Bidirectional Iterator]]
[[Random Access Traversal Iterator][Random Access Iterator]] [[Random Access Traversal Iterator][Random Access Iterator]]
] ]
If `transform_iterator` models Writable Lvalue Iterator then it is a If `transform_iterator` models Writable Lvalue Iterator then it is a
@ -160,7 +160,7 @@ interoperable with `Y`.
[h3 Operations] [h3 Operations]
In addition to the operations required by the [link iterator.specialized.transform.concepts concepts] modeled by In addition to the operations required by the [link transform.concepts concepts] modeled by
`transform_iterator`, `transform_iterator` provides the following `transform_iterator`, `transform_iterator` provides the following
operations: operations:
@ -177,13 +177,13 @@ operations:
template<class F2, class I2, class R2, class V2> template<class F2, class I2, class R2, class V2>
transform_iterator( transform_iterator(
transform_iterator<F2, I2, R2, V2> const& t transform_iterator<F2, I2, R2, V2> const& t
, typename enable_if_convertible<I2, Iterator>::type* = 0 // exposition only , typename enable_if_convertible<I2, Iterator>::type* = 0 // exposition only
, typename enable_if_convertible<F2, UnaryFunction>::type* = 0 // exposition only , typename enable_if_convertible<F2, UnaryFunction>::type* = 0 // exposition only
); );
[*Returns: ] An instance of `transform_iterator` with `m_f` [*Returns: ] An instance of `transform_iterator` with `m_f`
initialized to `t.functor()` and `m_iterator` initialized to initialized to `t.functor()` and `m_iterator` initialized to
`t.base()`.[br] `t.base()`.\n
[*Requires: ] `OtherIterator` is implicitly convertible to `Iterator`. [*Requires: ] `OtherIterator` is implicitly convertible to `Iterator`.
@ -204,13 +204,13 @@ operations:
transform_iterator& operator++(); transform_iterator& operator++();
[*Effects: ] `++m_iterator`[br] [*Effects: ] `++m_iterator`\n
[*Returns: ] `*this` [*Returns: ] `*this`
transform_iterator& operator--(); transform_iterator& operator--();
[*Effects: ] `--m_iterator`[br] [*Effects: ] `--m_iterator`\n
[*Returns: ] `*this` [*Returns: ] `*this`
[endsect] [endsect]

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@ -1,211 +0,0 @@
[section:traits Type Traits]
[h2 Overview]
Have you ever wanted to write a generic function that can operate
on any kind of dereferenceable object? If you have, you've
probably run into the problem of how to determine the type that the
object "points at":
template <class Dereferenceable>
void f(Dereferenceable p)
{
*what-goes-here?* value = \*p;
...
}
[h2 `pointee`]
It turns out to be impossible to come up with a fully-general
algorithm to do determine *what-goes-here* directly, but it is
possible to require that `pointee<Dereferenceable>::type` is
correct. Naturally, `pointee` has the same difficulty: it can't
determine the appropriate `::type` reliably for all
`Dereferenceable`\ s, but it makes very good guesses (it works
for all pointers, standard and boost smart pointers, and
iterators), and when it guesses wrongly, it can be specialized as
necessary:
namespace boost
{
template <class T>
struct pointee<third_party_lib::smart_pointer<T> >
{
typedef T type;
};
}
[h2 `indirect_reference`]
`indirect_reference<T>::type` is rather more specialized than
`pointee`, and is meant to be used to forward the result of
dereferencing an object of its argument type. Most dereferenceable
types just return a reference to their pointee, but some return
proxy references or return the pointee by value. When that
information is needed, call on `indirect_reference`.
Both of these templates are essential to the correct functioning of
[link iterator.specialized.indirect `indirect_iterator`].
[h2 `min_category`]
`min_category` takes one or more iterator categories or iterator traversal tags
and returns the one that is the weakest (i.e. least advanced). For example:
static_assert(
is_same<
min_category<
std::forward_iterator_tag,
std::random_access_iterator_tag
>::type,
std::forward_iterator_tag
>::value,
"Unexpected minimum_category result"
);
[h2 Iterator category and traversal tags manipulation]
The library provides several utilities to simplify conversions between iterator categories
and traversal tags:
* `iterator_category_to_traversal<C>::type` - the metafunction takes an iterator category `C` and returns
the corresponding traversal tag.
* `iterator_traversal<T>::type` - a shorthand for `iterator_category_to_traversal<iterator_category<T>::type>::type`.
* `pure_traversal_tag<T>::type` - the metafunction takes a tag `T` which derives from one of the iterator traversal tags
and returns that traversal tag. `T` may also derive from other tags describing the iterator (e.g. whether this is a `const`-iterator
or not), these additional tags are not considered.
* `pure_iterator_traversal<T>::type` - a shorthand for `pure_traversal_tag<iterator_traversal<T>::type>::type`.
[h2 Reference]
[h3 `pointee`]
template <class Dereferenceable>
struct pointee
{
typedef /* see below */ type;
};
[*Requires:] For an object `x` of type `Dereferenceable`, `*x`
is well-formed. If `++x` is ill-formed it shall neither be
ambiguous nor shall it violate access control, and
`Dereferenceable::element_type` shall be an accessible type.
Otherwise `iterator_traits<Dereferenceable>::value_type` shall
be well formed. \[Note: These requirements need not apply to
explicit or partial specializations of `pointee`\]
`type` is determined according to the following algorithm, where
`x` is an object of type `Dereferenceable`:
if ( ++x is ill-formed )
{
return Dereferenceable::element_type
}
else if (*x is a mutable reference to
std::iterator_traits<Dereferenceable>::value_type)
{
return iterator_traits<Dereferenceable>::value_type
}
else
{
return iterator_traits<Dereferenceable>::value_type const
}
[h3 `indirect_reference`]
template <class Dereferenceable>
struct indirect_reference
{
typedef /* see below */ type;
};
[*Requires:] For an object `x` of type `Dereferenceable`, `*x`
is well-formed. If `++x` is ill-formed it shall neither be
ambiguous nor shall it violate access control, and
`pointee<Dereferenceable>::type&` shall be well-formed.
Otherwise `iterator_traits<Dereferenceable>::reference` shall
be well formed. \[Note: These requirements need not apply to
explicit or partial specializations of `indirect_reference`\]
`type` is determined according to the following algorithm, where
`x` is an object of type `Dereferenceable`:
if ( ++x is ill-formed )
return pointee<Dereferenceable>::type&
else
std::iterator_traits<Dereferenceable>::reference
[h3 `minimum_category`]
template <typename C1, typename C2>
struct minimum_category
{
typedef /* see below */ type;
};
[*Requires:] Both `C1` and `C2` shall be standard iterator categories or
iterator traversal tags.
`type` is determined according to the following algorithm, where `c1` is an
object of type `C1` and `c2` is an object of type `C2`:
if (c1 is convertible to c2)
return C2;
else
return C1;
[note The above definition relies on the fact that the more restricting categories
and traversal tags are convertible to the less restricting ones.]
[h3 `iterator_category_to_traversal`]
template <typename C>
struct iterator_category_to_traversal
{
typedef /* see below */ type;
};
[*Requires:] `C` shall be a standard iterator category or an
iterator traversal tag.
If `C` is an iterator traversal tag or convertible to one, `type` equivalent to `C`.
Otherwise, `type` is defined to the closest iterator traversal tag matching `C`.
[h3 `iterator_traversal`]
template <typename Iterator>
struct iterator_traversal
{
typedef typename iterator_category_to_traversal<
typename iterator_category<Iterator>::type
>::type type;
};
[*Requires:] `Iterator` shall be an iterator.
[h3 `pure_traversal_tag`]
template <typename T>
struct pure_traversal_tag
{
typedef /* see below */ type;
};
[*Requires:] `T` shall be convertible to an iterator traversal tag.
`type` is defined to be the most advanced traversal tag `Tag` so that `T` is convertible to `Tag`.
[h3 `pure_iterator_traversal`]
template <typename Iterator>
struct pure_iterator_traversal
{
typedef typename pure_traversal_tag<
typename iterator_traversal<Iterator>::type
>::type type;
};
[*Requires:] `Iterator` shall be an iterator.
[endsect]

224
doc/quickbook/utilities.qbk Normal file
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@ -0,0 +1,224 @@
[section:utilities Iterator Utilities]
[section:utilities_traits Traits]
[h2 Overview]
Have you ever wanted to write a generic function that can operate
on any kind of dereferenceable object? If you have, you've
probably run into the problem of how to determine the type that the
object "points at":
template <class Dereferenceable>
void f(Dereferenceable p)
{
*what-goes-here?* value = \*p;
...
}
[h2 `pointee`]
It turns out to be impossible to come up with a fully-general
algorithm to do determine *what-goes-here* directly, but it is
possible to require that `pointee<Dereferenceable>::type` is
correct. Naturally, `pointee` has the same difficulty: it can't
determine the appropriate `::type` reliably for all
`Dereferenceable`\ s, but it makes very good guesses (it works
for all pointers, standard and boost smart pointers, and
iterators), and when it guesses wrongly, it can be specialized as
necessary:
namespace boost
{
template <class T>
struct pointee<third_party_lib::smart_pointer<T> >
{
typedef T type;
};
}
[h2 `indirect_reference`]
`indirect_reference<T>::type` is rather more specialized than
`pointee`, and is meant to be used to forward the result of
dereferencing an object of its argument type. Most dereferenceable
types just return a reference to their pointee, but some return
proxy references or return the pointee by value. When that
information is needed, call on `indirect_reference`.
Both of these templates are essential to the correct functioning of
[link indirecct `indirect_iterator`].
[h2 Reference]
[h3 `pointeee`]
template <class Dereferenceable>
struct pointee
{
typedef /* see below */ type;
};
[*Requires:] For an object `x` of type `Dereferenceable`, `*x`
is well-formed. If `++x` is ill-formed it shall neither be
ambiguous nor shall it violate access control, and
`Dereferenceable::element_type` shall be an accessible type.
Otherwise `iterator_traits<Dereferenceable>::value_type` shall
be well formed. \[Note: These requirements need not apply to
explicit or partial specializations of `pointee`\]
`type` is determined according to the following algorithm, where
`x` is an object of type `Dereferenceable`:
if ( ++x is ill-formed )
{
return `Dereferenceable::element_type`
}
else if (`*x` is a mutable reference to
std::iterator_traits<Dereferenceable>::value_type)
{
return iterator_traits<Dereferenceable>::value_type
}
else
{
return iterator_traits<Dereferenceable>::value_type const
}
[h3 `indirect_reference`]
template <class Dereferenceable>
struct indirect_reference
{
typedef /* see below */ type;
};
[*Requires:] For an object `x` of type `Dereferenceable`, `*x`
is well-formed. If `++x` is ill-formed it shall neither be
ambiguous nor shall it violate access control, and
`pointee<Dereferenceable>::type&` shall be well-formed.
Otherwise `iterator_traits<Dereferenceable>::reference` shall
be well formed. \[Note: These requirements need not apply to
explicit or partial specializations of `indirect_reference`\]
`type` is determined according to the following algorithm, where
`x` is an object of type `Dereferenceable`:
if ( ++x is ill-formed )
return `pointee<Dereferenceable>::type&`
else
std::iterator_traits<Dereferenceable>::reference
[endsect]
[section:utilities_testing Testing and Concept Checking]
The iterator concept checking classes provide a mechanism for a
template to report better error messages when a user instantiates
the template with a type that does not meet the requirements of the
template.
For an introduction to using concept checking classes, see
the documentation for the
[@../../concept_check/index.html `boost::concept_check`] library.
[h2 Reference]
[h3 Iterator Access Concepts]
* |Readable|_
* |Writable|_
* |Swappable|_
* |Lvalue|_
[/ .. |Readable| replace:: *Readable Iterator* ]
[/ .. _Readable: ReadableIterator.html ]
[/ ]
[/ .. |Writable| replace:: *Writable Iterator* ]
[/ .. _Writable: WritableIterator.html ]
[/ ]
[/ .. |Swappable| replace:: *Swappable Iterator* ]
[/ .. _Swappable: SwappableIterator.html ]
[/ ]
[/ .. |Lvalue| replace:: *Lvalue Iterator* ]
[/ .. _Lvalue: LvalueIterator.html ]
Iterator Traversal Concepts
...........................
* |Incrementable|_
* |SinglePass|_
* |Forward|_
* |Bidir|_
* |Random|_
[/ .. |Incrementable| replace:: *Incrementable Iterator* ]
[/ .. _Incrementable: IncrementableIterator.html ]
[/ ]
[/ .. |SinglePass| replace:: *Single Pass Iterator* ]
[/ .. _SinglePass: SinglePassIterator.html ]
[/ ]
[/ .. |Forward| replace:: *Forward Traversal* ]
[/ .. _Forward: ForwardTraversal.html ]
[/ ]
[/ .. |Bidir| replace:: *Bidirectional Traversal* ]
[/ .. _Bidir: BidirectionalTraversal.html ]
[/ ]
[/ .. |Random| replace:: *Random Access Traversal* ]
[/ .. _Random: RandomAccessTraversal.html ]
[h3 `iterator_concepts.hpp` Synopsis]
namespace boost_concepts {
// Iterator Access Concepts
template <typename Iterator>
class ReadableIteratorConcept;
template <
typename Iterator
, typename ValueType = std::iterator_traits<Iterator>::value_type
>
class WritableIteratorConcept;
template <typename Iterator>
class SwappableIteratorConcept;
template <typename Iterator>
class LvalueIteratorConcept;
// Iterator Traversal Concepts
template <typename Iterator>
class IncrementableIteratorConcept;
template <typename Iterator>
class SinglePassIteratorConcept;
template <typename Iterator>
class ForwardTraversalConcept;
template <typename Iterator>
class BidirectionalTraversalConcept;
template <typename Iterator>
class RandomAccessTraversalConcept;
// Interoperability
template <typename Iterator, typename ConstIterator>
class InteroperableIteratorConcept;
}
[endsect]
[endsect]

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@ -1,29 +1,20 @@
[section:zip Zip Iterator] [section:zip Zip Iterator]
The zip iterator provides the ability to parallel-iterate The zip iterator provides the ability to parallel-iterate
over several controlled sequences simultaneously. A zip over several controlled sequences simultaneously. A zip
iterator is constructed from a tuple of iterators. Moving iterator is constructed from a tuple of iterators. Moving
the zip iterator moves all the iterators in parallel. the zip iterator moves all the iterators in parallel.
Dereferencing the zip iterator returns a tuple that contains Dereferencing the zip iterator returns a tuple that contains
the results of dereferencing the individual iterators. the results of dereferencing the individual iterators.
The tuple of iterators is now implemented in terms of a Boost fusion sequence.
Because of this the 'tuple' may be any Boost fusion sequence and, for backwards
compatibility through a Boost fusion sequence adapter, a Boost tuple. Because the
'tuple' may be any boost::fusion sequence the 'tuple' may also be any type for which a
Boost fusion adapter exists. This includes, among others, a std::tuple and a std::pair.
Just remember to include the appropriate Boost fusion adapter header files for these
other Boost fusion adapters. The zip_iterator header file already includes the
Boost fusion adapter header file for Boost tuple, so you need not include it yourself
to use a Boost tuple as your 'tuple'.
[section:zip_example Example] [section:zip_example Example]
There are two main types of applications of the `zip_iterator`. The first There are two main types of applications of the `zip_iterator`. The first
one concerns runtime efficiency: If one has several controlled sequences one concerns runtime efficiency: If one has several controlled sequences
of the same length that must be somehow processed, e.g., with the of the same length that must be somehow processed, e.g., with the
`for_each` algorithm, then it is more efficient to perform just `for_each` algorithm, then it is more efficient to perform just
one parallel-iteration rather than several individual iterations. For an one parallel-iteration rather than several individual iterations. For an
example, assume that `vect_of_doubles` and `vect_of_ints` example, assume that `vect_of_doubles` and `vect_of_ints`
are two vectors of equal length containing doubles and ints, respectively, are two vectors of equal length containing doubles and ints, respectively,
and consider the following two iterations: and consider the following two iterations:
@ -52,10 +43,9 @@ These two iterations can now be replaced with a single one as follows:
A non-generic implementation of `zip_func` could look as follows: A non-generic implementation of `zip_func` could look as follows:
struct zip_func struct zip_func :
public std::unary_function<const boost::tuple<const double&, const int&>&, void>
{ {
using result_type = void;
void operator()(const boost::tuple<const double&, const int&>& t) const void operator()(const boost::tuple<const double&, const int&>& t) const
{ {
m_f0(t.get<0>()); m_f0(t.get<0>());
@ -72,16 +62,16 @@ to make combining iterators. A combining iterator is an iterator
that parallel-iterates over several controlled sequences and, upon that parallel-iterates over several controlled sequences and, upon
dereferencing, returns the result of applying a functor to the values of the dereferencing, returns the result of applying a functor to the values of the
sequences at the respective positions. This can now be achieved by using the sequences at the respective positions. This can now be achieved by using the
`zip_iterator` in conjunction with the `transform_iterator`. `zip_iterator` in conjunction with the `transform_iterator`.
Suppose, for example, that you have two vectors of doubles, say Suppose, for example, that you have two vectors of doubles, say
`vect_1` and `vect_2`, and you need to expose to a client `vect_1` and `vect_2`, and you need to expose to a client
a controlled sequence containing the products of the elements of a controlled sequence containing the products of the elements of
`vect_1` and `vect_2`. Rather than placing these products `vect_1` and `vect_2`. Rather than placing these products
in a third vector, you can use a combining iterator that calculates the in a third vector, you can use a combining iterator that calculates the
products on the fly. Let us assume that `tuple_multiplies` is a products on the fly. Let us assume that `tuple_multiplies` is a
functor that works like `std::multiplies`, except that it takes functor that works like `std::multiplies`, except that it takes
its two arguments packaged in a tuple. Then the two iterators its two arguments packaged in a tuple. Then the two iterators
`it_begin` and `it_end` defined below delimit a controlled `it_begin` and `it_end` defined below delimit a controlled
sequence containing the products of the elements of `vect_1` and sequence containing the products of the elements of `vect_1` and
`vect_2`: `vect_2`:
@ -128,7 +118,7 @@ sequence containing the products of the elements of `vect_1` and
template<typename IteratorTuple> template<typename IteratorTuple>
class zip_iterator class zip_iterator
{ {
public: public:
typedef /* see below */ reference; typedef /* see below */ reference;
@ -154,8 +144,8 @@ sequence containing the products of the elements of `vect_1` and
IteratorTuple m_iterator_tuple; // exposition only IteratorTuple m_iterator_tuple; // exposition only
}; };
template<typename IteratorTuple> template<typename IteratorTuple>
zip_iterator<IteratorTuple> zip_iterator<IteratorTuple>
make_zip_iterator(IteratorTuple t); make_zip_iterator(IteratorTuple t);
The `reference` member of `zip_iterator` is the type of the tuple The `reference` member of `zip_iterator` is the type of the tuple
@ -168,23 +158,23 @@ of the first of the iterator types in the `IteratorTuple` argument.
The `iterator_category` member of `zip_iterator` is convertible to the The `iterator_category` member of `zip_iterator` is convertible to the
minimum of the traversal categories of the iterator types in the `IteratorTuple` minimum of the traversal categories of the iterator types in the `IteratorTuple`
argument. For example, if the `zip_iterator` holds only vector argument. For example, if the `zip_iterator` holds only vector
iterators, then `iterator_category` is convertible to iterators, then `iterator_category` is convertible to
`boost::random_access_traversal_tag`. If you add a list iterator, then `boost::random_access_traversal_tag`. If you add a list iterator, then
`iterator_category` will be convertible to `boost::bidirectional_traversal_tag`, `iterator_category` will be convertible to `boost::bidirectional_traversal_tag`,
but no longer to `boost::random_access_traversal_tag`. but no longer to `boost::random_access_traversal_tag`.
[h2 Requirements] [h2 Requirements]
All iterator types in the argument `IteratorTuple` shall model Readable Iterator. All iterator types in the argument `IteratorTuple` shall model Readable Iterator.
[h2 Concepts] [h2 Concepts]
The resulting `zip_iterator` models Readable Iterator. The resulting `zip_iterator` models Readable Iterator.
The fact that the `zip_iterator` models only Readable Iterator does not The fact that the `zip_iterator` models only Readable Iterator does not
prevent you from modifying the values that the individual iterators point prevent you from modifying the values that the individual iterators point
to. The tuple returned by the `zip_iterator`'s `operator*` is a tuple to. The tuple returned by the `zip_iterator`'s `operator*` is a tuple
constructed from the reference types of the individual iterators, not constructed from the reference types of the individual iterators, not
their value types. For example, if `zip_it` is a `zip_iterator` whose their value types. For example, if `zip_it` is a `zip_iterator` whose
first member iterator is an `std::vector<double>::iterator`, then the first member iterator is an `std::vector<double>::iterator`, then the
following line will modify the value which the first member iterator of following line will modify the value which the first member iterator of
@ -195,7 +185,7 @@ following line will modify the value which the first member iterator of
Consider the set of standard traversal concepts obtained by taking Consider the set of standard traversal concepts obtained by taking
the most refined standard traversal concept modeled by each individual the most refined standard traversal concept modeled by each individual
iterator type in the `IteratorTuple` argument.The `zip_iterator` iterator type in the `IteratorTuple` argument.The `zip_iterator`
models the least refined standard traversal concept in this set. models the least refined standard traversal concept in this set.
`zip_iterator<IteratorTuple1>` is interoperable with `zip_iterator<IteratorTuple1>` is interoperable with
@ -228,7 +218,7 @@ operations.
, IteratorTuple>::type* = 0 // exposition only , IteratorTuple>::type* = 0 // exposition only
); );
[*Returns:] An instance of `zip_iterator` that is a copy of `other`.[br] [*Returns:] An instance of `zip_iterator` that is a copy of `other`.\n
[*Requires:] `OtherIteratorTuple` is implicitly convertible to `IteratorTuple`. [*Requires:] `OtherIteratorTuple` is implicitly convertible to `IteratorTuple`.
@ -245,17 +235,17 @@ operations.
zip_iterator& operator++(); zip_iterator& operator++();
[*Effects:] Increments each iterator in `m_iterator_tuple`.[br] [*Effects:] Increments each iterator in `m_iterator_tuple`.\n
[*Returns:] `*this` [*Returns:] `*this`
zip_iterator& operator--(); zip_iterator& operator--();
[*Effects:] Decrements each iterator in `m_iterator_tuple`.[br] [*Effects:] Decrements each iterator in `m_iterator_tuple`.\n
[*Returns:] `*this` [*Returns:] `*this`
template<typename IteratorTuple> template<typename IteratorTuple>
zip_iterator<IteratorTuple> zip_iterator<IteratorTuple>
make_zip_iterator(IteratorTuple t); make_zip_iterator(IteratorTuple t);
[*Returns:] An instance of `zip_iterator<IteratorTuple>` with `m_iterator_tuple` [*Returns:] An instance of `zip_iterator<IteratorTuple>` with `m_iterator_tuple`
@ -263,4 +253,4 @@ operations.
[endsect] [endsect]
[endsect] [endsect]

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@ -3,11 +3,12 @@
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
.. _N1550: http://www.boost-consulting.com/writing/n1550.html .. _N1550: http://www.boost-consulting.com/writing/n1550.html
.. _N1530: http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2003/n1530.html .. _N1530: http://anubis.dkuug.dk/jtc1/sc22/wg21/docs/papers/2003/n1530.html
:Author: David Abrahams and Jeremy Siek :Author: David Abrahams and Jeremy Siek
:Contact: dave@boost-consulting.com, jsiek@osl.iu.edu :Contact: dave@boost-consulting.com, jsiek@osl.iu.edu
:Organization: `Boost Consulting`_, Indiana University Bloomington :Organization: `Boost Consulting`_, Indiana University Bloomington
:date: $Date$
:Copyright: Copyright David Abrahams, Jeremy Siek 2003. Use, modification and :Copyright: Copyright David Abrahams, Jeremy Siek 2003. Use, modification and
distribution is subject to the Boost Software License, distribution is subject to the Boost Software License,
Version 1.0. (See accompanying file LICENSE_1_0.txt or copy Version 1.0. (See accompanying file LICENSE_1_0.txt or copy

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@ -11,6 +11,7 @@
:organization: `Boost Consulting`_, Indiana University `Open Systems :organization: `Boost Consulting`_, Indiana University `Open Systems
Lab`_, University of Hanover `Institute for Transport Lab`_, University of Hanover `Institute for Transport
Railway Operation and Construction`_ Railway Operation and Construction`_
:date: $Date$
:copyright: Copyright David Abrahams, Jeremy Siek, and Thomas Witt 2003. :copyright: Copyright David Abrahams, Jeremy Siek, and Thomas Witt 2003.
.. _`Boost Consulting`: http://www.boost-consulting.com .. _`Boost Consulting`: http://www.boost-consulting.com

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@ -99,7 +99,7 @@ private:
</pre> </pre>
<p>If <tt class="docutils literal"><span class="pre">Reference</span></tt> is <tt class="docutils literal"><span class="pre">use_default</span></tt> then the <tt class="docutils literal"><span class="pre">reference</span></tt> member of <p>If <tt class="docutils literal"><span class="pre">Reference</span></tt> is <tt class="docutils literal"><span class="pre">use_default</span></tt> then the <tt class="docutils literal"><span class="pre">reference</span></tt> member of
<tt class="docutils literal"><span class="pre">transform_iterator</span></tt> is <tt class="docutils literal"><span class="pre">transform_iterator</span></tt> is
<tt class="docutils literal"><span class="pre">result_of&lt;const UnaryFunction(iterator_traits&lt;Iterator&gt;::reference)&gt;::type</span></tt>. <tt class="docutils literal"><span class="pre">result_of&lt;UnaryFunction(iterator_traits&lt;Iterator&gt;::reference)&gt;::type</span></tt>.
Otherwise, <tt class="docutils literal"><span class="pre">reference</span></tt> is <tt class="docutils literal"><span class="pre">Reference</span></tt>.</p> Otherwise, <tt class="docutils literal"><span class="pre">reference</span></tt> is <tt class="docutils literal"><span class="pre">Reference</span></tt>.</p>
<p>If <tt class="docutils literal"><span class="pre">Value</span></tt> is <tt class="docutils literal"><span class="pre">use_default</span></tt> then the <tt class="docutils literal"><span class="pre">value_type</span></tt> member is <p>If <tt class="docutils literal"><span class="pre">Value</span></tt> is <tt class="docutils literal"><span class="pre">use_default</span></tt> then the <tt class="docutils literal"><span class="pre">value_type</span></tt> member is
<tt class="docutils literal"><span class="pre">remove_cv&lt;remove_reference&lt;reference&gt;</span> <span class="pre">&gt;::type</span></tt>. Otherwise, <tt class="docutils literal"><span class="pre">remove_cv&lt;remove_reference&lt;reference&gt;</span> <span class="pre">&gt;::type</span></tt>. Otherwise,
@ -117,10 +117,10 @@ convertible to <tt class="docutils literal"><span class="pre">input_iterator_tag
<div class="section" id="transform-iterator-requirements"> <div class="section" id="transform-iterator-requirements">
<h1><a class="toc-backref" href="#id3"><tt class="docutils literal"><span class="pre">transform_iterator</span></tt> requirements</a></h1> <h1><a class="toc-backref" href="#id3"><tt class="docutils literal"><span class="pre">transform_iterator</span></tt> requirements</a></h1>
<p>The type <tt class="docutils literal"><span class="pre">UnaryFunction</span></tt> must be Assignable, Copy Constructible, and <p>The type <tt class="docutils literal"><span class="pre">UnaryFunction</span></tt> must be Assignable, Copy Constructible, and
the expression <tt class="docutils literal"><span class="pre">f(*i)</span></tt> must be valid where <tt class="docutils literal"><span class="pre">f</span></tt> is a const object of the expression <tt class="docutils literal"><span class="pre">f(*i)</span></tt> must be valid where <tt class="docutils literal"><span class="pre">f</span></tt> is an object of
type <tt class="docutils literal"><span class="pre">UnaryFunction</span></tt>, <tt class="docutils literal"><span class="pre">i</span></tt> is an object of type <tt class="docutils literal"><span class="pre">Iterator</span></tt>, and type <tt class="docutils literal"><span class="pre">UnaryFunction</span></tt>, <tt class="docutils literal"><span class="pre">i</span></tt> is an object of type <tt class="docutils literal"><span class="pre">Iterator</span></tt>, and
where the type of <tt class="docutils literal"><span class="pre">f(*i)</span></tt> must be where the type of <tt class="docutils literal"><span class="pre">f(*i)</span></tt> must be
<tt class="docutils literal"><span class="pre">result_of&lt;const UnaryFunction(iterator_traits&lt;Iterator&gt;::reference)&gt;::type</span></tt>.</p> <tt class="docutils literal"><span class="pre">result_of&lt;UnaryFunction(iterator_traits&lt;Iterator&gt;::reference)&gt;::type</span></tt>.</p>
<p>The argument <tt class="docutils literal"><span class="pre">Iterator</span></tt> shall model Readable Iterator.</p> <p>The argument <tt class="docutils literal"><span class="pre">Iterator</span></tt> shall model Readable Iterator.</p>
</div> </div>
<div class="section" id="transform-iterator-models"> <div class="section" id="transform-iterator-models">

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@ -11,6 +11,7 @@
:organization: `Boost Consulting`_, Indiana University `Open Systems :organization: `Boost Consulting`_, Indiana University `Open Systems
Lab`_, University of Hanover `Institute for Transport Lab`_, University of Hanover `Institute for Transport
Railway Operation and Construction`_ Railway Operation and Construction`_
:date: $Date$
:copyright: Copyright David Abrahams, Jeremy Siek, and Thomas Witt 2003. :copyright: Copyright David Abrahams, Jeremy Siek, and Thomas Witt 2003.
.. _`Boost Consulting`: http://www.boost-consulting.com .. _`Boost Consulting`: http://www.boost-consulting.com

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@ -41,7 +41,7 @@
If ``Reference`` is ``use_default`` then the ``reference`` member of If ``Reference`` is ``use_default`` then the ``reference`` member of
``transform_iterator`` is ``transform_iterator`` is
``result_of<const UnaryFunction(iterator_traits<Iterator>::reference)>::type``. ``result_of<UnaryFunction(iterator_traits<Iterator>::reference)>::type``.
Otherwise, ``reference`` is ``Reference``. Otherwise, ``reference`` is ``Reference``.
If ``Value`` is ``use_default`` then the ``value_type`` member is If ``Value`` is ``use_default`` then the ``value_type`` member is
@ -64,10 +64,10 @@ convertible to ``input_iterator_tag``.
................................... ...................................
The type ``UnaryFunction`` must be Assignable, Copy Constructible, and The type ``UnaryFunction`` must be Assignable, Copy Constructible, and
the expression ``f(*i)`` must be valid where ``f`` is a const object of the expression ``f(*i)`` must be valid where ``f`` is an object of
type ``UnaryFunction``, ``i`` is an object of type ``Iterator``, and type ``UnaryFunction``, ``i`` is an object of type ``Iterator``, and
where the type of ``f(*i)`` must be where the type of ``f(*i)`` must be
``result_of<const UnaryFunction(iterator_traits<Iterator>::reference)>::type``. ``result_of<UnaryFunction(iterator_traits<Iterator>::reference)>::type``.
The argument ``Iterator`` shall model Readable Iterator. The argument ``Iterator`` shall model Readable Iterator.

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@ -9,6 +9,7 @@
:Author: David Abrahams, Thomas Becker :Author: David Abrahams, Thomas Becker
:Contact: dave@boost-consulting.com, thomas@styleadvisor.com :Contact: dave@boost-consulting.com, thomas@styleadvisor.com
:organization: `Boost Consulting`_, `Zephyr Associates, Inc.`_ :organization: `Boost Consulting`_, `Zephyr Associates, Inc.`_
:date: $Date$
:copyright: Copyright David Abrahams and Thomas Becker 2003. :copyright: Copyright David Abrahams and Thomas Becker 2003.
.. _`Boost Consulting`: http://www.boost-consulting.com .. _`Boost Consulting`: http://www.boost-consulting.com

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@ -8,13 +8,3 @@ iterator is constructed from a tuple of iterators. Moving
the zip iterator moves all the iterators in parallel. the zip iterator moves all the iterators in parallel.
Dereferencing the zip iterator returns a tuple that contains Dereferencing the zip iterator returns a tuple that contains
the results of dereferencing the individual iterators. the results of dereferencing the individual iterators.
The tuple of iterators is now implemented in terms of a Boost fusion sequence.
Because of this the 'tuple' may be any Boost fusion sequence and, for backwards
compatibility through a Boost fusion sequence adapter, a Boost tuple. Because the
'tuple' may be any boost::fusion sequence the 'tuple' may also be any type for which a
Boost fusion adapter exists. This includes, among others, a std::tuple and a std::pair.
Just remember to include the appropriate Boost fusion adapter header files for these
other Boost fusion adapters. The zip_iterator header file already includes the
Boost fusion adapter header file for Boost tuple, so you need not include it yourself
to use a Boost tuple as your 'tuple'.

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@ -45,7 +45,8 @@ A non-generic implementation of ``zip_func`` could look as follows:
:: ::
struct zip_func struct zip_func :
public std::unary_function<const boost::tuple<const double&, const int&>&, void>
{ {
void operator()(const boost::tuple<const double&, const int&>& t) const void operator()(const boost::tuple<const double&, const int&>& t) const
{ {

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@ -41,12 +41,12 @@ int main(int, char*[])
// Use indirect iterator to print out numbers by accessing // Use indirect iterator to print out numbers by accessing
// them through the array of pointers. // them through the array of pointers.
std::cout << "indirectly printing out the numbers from 0 to " std::cout << "indirectly printing out the numbers from 0 to "
<< N << std::endl; << N << std::endl;
std::copy(boost::make_indirect_iterator(pointers.begin()), std::copy(boost::make_indirect_iterator(pointers.begin()),
boost::make_indirect_iterator(pointers.end()), boost::make_indirect_iterator(pointers.end()),
std::ostream_iterator<int>(std::cout, " ")); std::ostream_iterator<int>(std::cout, " "));
std::cout << std::endl; std::cout << std::endl;
return boost::exit_success; return boost::exit_success;
} }

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@ -8,7 +8,6 @@
#include <functional> #include <functional>
#include <iostream> #include <iostream>
#include <boost/iterator/filter_iterator.hpp> #include <boost/iterator/filter_iterator.hpp>
#include <boost/bind/bind.hpp>
#include <boost/cstdlib.hpp> // for exit_success #include <boost/cstdlib.hpp> // for exit_success
struct is_positive_number { struct is_positive_number {
@ -19,10 +18,10 @@ int main()
{ {
int numbers_[] = { 0, -1, 4, -3, 5, 8, -2 }; int numbers_[] = { 0, -1, 4, -3, 5, 8, -2 };
const int N = sizeof(numbers_)/sizeof(int); const int N = sizeof(numbers_)/sizeof(int);
typedef int* base_iterator; typedef int* base_iterator;
base_iterator numbers(numbers_); base_iterator numbers(numbers_);
// Example using make_filter_iterator() // Example using make_filter_iterator()
std::copy(boost::make_filter_iterator<is_positive_number>(numbers, numbers + N), std::copy(boost::make_filter_iterator<is_positive_number>(numbers, numbers + N),
boost::make_filter_iterator<is_positive_number>(numbers + N, numbers + N), boost::make_filter_iterator<is_positive_number>(numbers + N, numbers + N),
@ -32,7 +31,7 @@ int main()
// Example using filter_iterator // Example using filter_iterator
typedef boost::filter_iterator<is_positive_number, base_iterator> typedef boost::filter_iterator<is_positive_number, base_iterator>
FilterIter; FilterIter;
is_positive_number predicate; is_positive_number predicate;
FilterIter filter_iter_first(predicate, numbers, numbers + N); FilterIter filter_iter_first(predicate, numbers, numbers + N);
FilterIter filter_iter_last(predicate, numbers + N, numbers + N); FilterIter filter_iter_last(predicate, numbers + N, numbers + N);
@ -43,17 +42,17 @@ int main()
// Another example using make_filter_iterator() // Another example using make_filter_iterator()
std::copy( std::copy(
boost::make_filter_iterator( boost::make_filter_iterator(
boost::bind(std::greater<int>(), boost::placeholders::_1, -2) std::bind2nd(std::greater<int>(), -2)
, numbers, numbers + N) , numbers, numbers + N)
, boost::make_filter_iterator( , boost::make_filter_iterator(
boost::bind(std::greater<int>(), boost::placeholders::_1, -2) std::bind2nd(std::greater<int>(), -2)
, numbers + N, numbers + N) , numbers + N, numbers + N)
, std::ostream_iterator<int>(std::cout, " ") , std::ostream_iterator<int>(std::cout, " ")
); );
std::cout << std::endl; std::cout << std::endl;
return boost::exit_success; return boost::exit_success;
} }

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@ -12,14 +12,14 @@
#include <string> #include <string>
#include <vector> #include <vector>
#include <boost/iterator/function_output_iterator.hpp> #include <boost/function_output_iterator.hpp>
struct string_appender struct string_appender
{ {
string_appender(std::string& s) string_appender(std::string& s)
: m_str(&s) : m_str(&s)
{} {}
void operator()(const std::string& x) const void operator()(const std::string& x) const
{ {
*m_str += x; *m_str += x;
@ -37,9 +37,9 @@ int main(int, char*[])
x.push_back("!"); x.push_back("!");
std::string s = ""; std::string s = "";
std::copy(x.begin(), x.end(), std::copy(x.begin(), x.end(),
boost::make_function_output_iterator(string_appender(s))); boost::make_function_output_iterator(string_appender(s)));
std::cout << s << std::endl; std::cout << s << std::endl;
return 0; return 0;

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@ -9,7 +9,6 @@
#include <iterator> #include <iterator>
#include <functional> #include <functional>
#include <algorithm> #include <algorithm>
#include <boost/bind/bind.hpp>
#include <boost/iterator/indirect_iterator.hpp> #include <boost/iterator/indirect_iterator.hpp>
int main(int, char*[]) int main(int, char*[])
@ -21,13 +20,13 @@ int main(int, char*[])
pointers_to_chars[i] = &characters[i]; pointers_to_chars[i] = &characters[i];
// Example of using indirect_iterator // Example of using indirect_iterator
boost::indirect_iterator<char**, char> boost::indirect_iterator<char**, char>
indirect_first(pointers_to_chars), indirect_last(pointers_to_chars + N); indirect_first(pointers_to_chars), indirect_last(pointers_to_chars + N);
std::copy(indirect_first, indirect_last, std::ostream_iterator<char>(std::cout, ",")); std::copy(indirect_first, indirect_last, std::ostream_iterator<char>(std::cout, ","));
std::cout << std::endl; std::cout << std::endl;
// Example of making mutable and constant indirect iterators // Example of making mutable and constant indirect iterators
@ -42,19 +41,19 @@ int main(int, char*[])
const_indirect_last(pointers_to_chars + N); const_indirect_last(pointers_to_chars + N);
std::transform(const_indirect_first, const_indirect_last, std::transform(const_indirect_first, const_indirect_last,
mutable_indirect_first, boost::bind(std::plus<char>(), 1, boost::placeholders::_1)); mutable_indirect_first, std::bind1st(std::plus<char>(), 1));
std::copy(mutable_indirect_first, mutable_indirect_last, std::copy(mutable_indirect_first, mutable_indirect_last,
std::ostream_iterator<char>(std::cout, ",")); std::ostream_iterator<char>(std::cout, ","));
std::cout << std::endl; std::cout << std::endl;
// Example of using make_indirect_iterator() // Example of using make_indirect_iterator()
std::copy(boost::make_indirect_iterator(pointers_to_chars), std::copy(boost::make_indirect_iterator(pointers_to_chars),
boost::make_indirect_iterator(pointers_to_chars + N), boost::make_indirect_iterator(pointers_to_chars + N),
std::ostream_iterator<char>(std::cout, ",")); std::ostream_iterator<char>(std::cout, ","));
std::cout << std::endl; std::cout << std::endl;
return 0; return 0;
} }

View File

@ -24,7 +24,7 @@ struct node_base
virtual void print(std::ostream& s) const = 0; virtual void print(std::ostream& s) const = 0;
virtual void double_me() = 0; virtual void double_me() = 0;
void append(node_base* p) void append(node_base* p)
{ {
if (m_next) if (m_next)
@ -32,7 +32,7 @@ struct node_base
else else
m_next = p; m_next = p;
} }
private: private:
node_base* m_next; node_base* m_next;
}; };
@ -52,9 +52,9 @@ struct node : node_base
void print(std::ostream& s) const { s << this->m_value; } void print(std::ostream& s) const { s << this->m_value; }
void double_me() { m_value += m_value; } void double_me() { m_value += m_value; }
private: private:
T m_value; T m_value;
}; };
#endif // NODE_DWA2004110_HPP #endif // NODE_DWA2004110_HPP

View File

@ -11,17 +11,7 @@
int main() int main()
{ {
#if defined(BOOST_NO_CXX11_SMART_PTR)
std::auto_ptr<node<int> > nodes(new node<int>(42)); std::auto_ptr<node<int> > nodes(new node<int>(42));
#else
std::unique_ptr<node<int> > nodes(new node<int>(42));
#endif
nodes->append(new node<std::string>(" is greater than ")); nodes->append(new node<std::string>(" is greater than "));
nodes->append(new node<int>(13)); nodes->append(new node<int>(13));
@ -30,7 +20,7 @@ int main()
, std::ostream_iterator<node_base>(std::cout, " ") , std::ostream_iterator<node_base>(std::cout, " ")
); );
std::cout << std::endl; std::cout << std::endl;
std::for_each( std::for_each(
node_iterator(nodes.get()), node_iterator() node_iterator(nodes.get()), node_iterator()
, std::mem_fun_ref(&node_base::double_me) , std::mem_fun_ref(&node_base::double_me)

View File

@ -28,10 +28,10 @@ class node_iterator
void increment() void increment()
{ m_node = m_node->next(); } { m_node = m_node->next(); }
bool equal(node_iterator const& other) const bool equal(node_iterator const& other) const
{ return this->m_node == other.m_node; } { return this->m_node == other.m_node; }
node_base& dereference() const node_base& dereference() const
{ return *m_node; } { return *m_node; }

View File

@ -12,33 +12,23 @@
int main() int main()
{ {
#if defined(BOOST_NO_CXX11_SMART_PTR)
std::auto_ptr<node<int> > nodes(new node<int>(42)); std::auto_ptr<node<int> > nodes(new node<int>(42));
#else
std::unique_ptr<node<int> > nodes(new node<int>(42));
#endif
nodes->append(new node<std::string>(" is greater than ")); nodes->append(new node<std::string>(" is greater than "));
nodes->append(new node<int>(13)); nodes->append(new node<int>(13));
// Check interoperability // Check interoperability
assert(node_iterator(nodes.get()) == node_const_iterator(nodes.get())); assert(node_iterator(nodes.get()) == node_const_iterator(nodes.get()));
assert(node_const_iterator(nodes.get()) == node_iterator(nodes.get())); assert(node_const_iterator(nodes.get()) == node_iterator(nodes.get()));
assert(node_iterator(nodes.get()) != node_const_iterator()); assert(node_iterator(nodes.get()) != node_const_iterator());
assert(node_const_iterator(nodes.get()) != node_iterator()); assert(node_const_iterator(nodes.get()) != node_iterator());
std::copy( std::copy(
node_iterator(nodes.get()), node_iterator() node_iterator(nodes.get()), node_iterator()
, std::ostream_iterator<node_base>(std::cout, " ") , std::ostream_iterator<node_base>(std::cout, " ")
); );
std::cout << std::endl; std::cout << std::endl;
std::for_each( std::for_each(
node_iterator(nodes.get()), node_iterator() node_iterator(nodes.get()), node_iterator()
, boost::mem_fn(&node_base::double_me) , boost::mem_fn(&node_base::double_me)

View File

@ -6,7 +6,11 @@
# include "node.hpp" # include "node.hpp"
# include <boost/iterator/iterator_facade.hpp> # include <boost/iterator/iterator_facade.hpp>
# include <type_traits>
# ifndef BOOST_NO_SFINAE
# include <boost/type_traits/is_convertible.hpp>
# include <boost/utility/enable_if.hpp>
# endif
template <class Value> template <class Value>
class node_iter class node_iter
@ -29,13 +33,21 @@ class node_iter
template <class OtherValue> template <class OtherValue>
node_iter( node_iter(
node_iter<OtherValue> const& other node_iter<OtherValue> const& other
, typename std::enable_if< # ifndef BOOST_NO_SFINAE
std::is_convertible<OtherValue*,Value*>::value , typename boost::enable_if<
boost::is_convertible<OtherValue*,Value*>
, enabler , enabler
>::type = enabler() >::type = enabler()
# endif
) )
: m_node(other.m_node) {} : m_node(other.m_node) {}
# if !BOOST_WORKAROUND(__GNUC__, == 2)
private: // GCC2 can't grant friendship to template member functions
friend class boost::iterator_core_access;
# endif
template <class OtherValue> template <class OtherValue>
bool equal(node_iter<OtherValue> const& other) const bool equal(node_iter<OtherValue> const& other) const
{ {
@ -51,7 +63,7 @@ class node_iter
# else # else
private: private:
template <class> friend class node_iter; template <class> friend class node_iter;
# endif # endif
Value* m_node; Value* m_node;
}; };

View File

@ -12,33 +12,23 @@
int main() int main()
{ {
#if defined(BOOST_NO_CXX11_SMART_PTR)
std::auto_ptr<node<int> > nodes(new node<int>(42)); std::auto_ptr<node<int> > nodes(new node<int>(42));
#else
std::unique_ptr<node<int> > nodes(new node<int>(42));
#endif
nodes->append(new node<std::string>(" is greater than ")); nodes->append(new node<std::string>(" is greater than "));
nodes->append(new node<int>(13)); nodes->append(new node<int>(13));
// Check interoperability // Check interoperability
assert(node_iterator(nodes.get()) == node_const_iterator(nodes.get())); assert(node_iterator(nodes.get()) == node_const_iterator(nodes.get()));
assert(node_const_iterator(nodes.get()) == node_iterator(nodes.get())); assert(node_const_iterator(nodes.get()) == node_iterator(nodes.get()));
assert(node_iterator(nodes.get()) != node_const_iterator()); assert(node_iterator(nodes.get()) != node_const_iterator());
assert(node_const_iterator(nodes.get()) != node_iterator()); assert(node_const_iterator(nodes.get()) != node_iterator());
std::copy( std::copy(
node_iterator(nodes.get()), node_iterator() node_iterator(nodes.get()), node_iterator()
, std::ostream_iterator<node_base>(std::cout, " ") , std::ostream_iterator<node_base>(std::cout, " ")
); );
std::cout << std::endl; std::cout << std::endl;
std::for_each( std::for_each(
node_iterator(nodes.get()), node_iterator() node_iterator(nodes.get()), node_iterator()
, boost::mem_fn(&node_base::double_me) , boost::mem_fn(&node_base::double_me)

View File

@ -6,7 +6,11 @@
# include "node.hpp" # include "node.hpp"
# include <boost/iterator/iterator_adaptor.hpp> # include <boost/iterator/iterator_adaptor.hpp>
# include <type_traits>
# ifndef BOOST_NO_SFINAE
# include <boost/type_traits/is_convertible.hpp>
# include <boost/utility/enable_if.hpp>
# endif
template <class Value> template <class Value>
class node_iter class node_iter
@ -23,7 +27,7 @@ class node_iter
typedef boost::iterator_adaptor< typedef boost::iterator_adaptor<
node_iter<Value>, Value*, boost::use_default, boost::forward_traversal_tag node_iter<Value>, Value*, boost::use_default, boost::forward_traversal_tag
> super_t; > super_t;
public: public:
node_iter() node_iter()
: super_t(0) {} : super_t(0) {}
@ -34,17 +38,19 @@ class node_iter
template <class OtherValue> template <class OtherValue>
node_iter( node_iter(
node_iter<OtherValue> const& other node_iter<OtherValue> const& other
, typename std::enable_if< # ifndef BOOST_NO_SFINAE
std::is_convertible<OtherValue*,Value*>::value , typename boost::enable_if<
boost::is_convertible<OtherValue*,Value*>
, enabler , enabler
>::type = enabler() >::type = enabler()
# endif
) )
: super_t(other.base()) {} : super_t(other.base()) {}
# if !BOOST_WORKAROUND(__GNUC__, == 2) # if !BOOST_WORKAROUND(__GNUC__, == 2)
private: // GCC2 can't grant friendship to template member functions private: // GCC2 can't grant friendship to template member functions
friend class boost::iterator_core_access; friend class boost::iterator_core_access;
# endif # endif
void increment() { this->base_reference() = this->base()->next(); } void increment() { this->base_reference() = this->base()->next(); }
}; };

View File

@ -27,7 +27,7 @@ int main() {
*el_it = std::distance(elements.begin(), el_it); *el_it = std::distance(elements.begin(), el_it);
index_type indices( index_size ); index_type indices( index_size );
for(index_type::iterator i_it = indices.begin() ; i_it != indices.end() ; ++i_it ) for(index_type::iterator i_it = indices.begin() ; i_it != indices.end() ; ++i_it )
*i_it = element_range_size - index_size + std::distance(indices.begin(), i_it); *i_it = element_range_size - index_size + std::distance(indices.begin(), i_it);
std::reverse( indices.begin(), indices.end() ); std::reverse( indices.begin(), indices.end() );

View File

@ -15,13 +15,13 @@ int main(int, char*[])
const int N = sizeof(letters_)/sizeof(char) - 1; const int N = sizeof(letters_)/sizeof(char) - 1;
typedef char* base_iterator; typedef char* base_iterator;
base_iterator letters(letters_); base_iterator letters(letters_);
std::cout << "original sequence of letters:\t\t\t" std::cout << "original sequence of letters:\t\t\t"
<< letters_ << std::endl; << letters_ << std::endl;
// Use reverse_iterator to print a sequence of letters in reverse // Use reverse_iterator to print a sequence of letters in reverse
// order. // order.
boost::reverse_iterator<base_iterator> boost::reverse_iterator<base_iterator>
reverse_letters_first(letters + N), reverse_letters_first(letters + N),
reverse_letters_last(letters); reverse_letters_last(letters);

View File

@ -1,42 +0,0 @@
// Copyright 2003 The Trustees of Indiana University.
// Use, modification and distribution is subject to the Boost Software
// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
#include "boost/shared_container_iterator.hpp"
#include "boost/shared_ptr.hpp"
#include <algorithm>
#include <iostream>
#include <vector>
typedef boost::shared_container_iterator< std::vector<int> > iterator;
void set_range(iterator& i, iterator& end) {
boost::shared_ptr< std::vector<int> > ints(new std::vector<int>());
ints->push_back(0);
ints->push_back(1);
ints->push_back(2);
ints->push_back(3);
ints->push_back(4);
ints->push_back(5);
i = iterator(ints->begin(),ints);
end = iterator(ints->end(),ints);
}
int main() {
iterator i,end;
set_range(i,end);
std::copy(i,end,std::ostream_iterator<int>(std::cout,","));
std::cout.put('\n');
return 0;
}

View File

@ -1,43 +0,0 @@
// Copyright 2003 The Trustees of Indiana University.
// Use, modification and distribution is subject to the Boost Software
// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
#include "boost/shared_container_iterator.hpp"
#include "boost/shared_ptr.hpp"
#include <algorithm>
#include <iterator>
#include <iostream>
#include <vector>
template <typename Iterator>
void print_range_nl (Iterator begin, Iterator end) {
typedef typename std::iterator_traits<Iterator>::value_type val;
std::copy(begin,end,std::ostream_iterator<val>(std::cout,","));
std::cout.put('\n');
}
int main() {
typedef boost::shared_ptr< std::vector<int> > ints_t;
{
ints_t ints(new std::vector<int>());
ints->push_back(0);
ints->push_back(1);
ints->push_back(2);
ints->push_back(3);
ints->push_back(4);
ints->push_back(5);
print_range_nl(boost::make_shared_container_iterator(ints->begin(),ints),
boost::make_shared_container_iterator(ints->end(),ints));
}
return 0;
}

View File

@ -1,41 +0,0 @@
// Copyright 2003 The Trustees of Indiana University.
// Use, modification and distribution is subject to the Boost Software
// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
#include "boost/shared_container_iterator.hpp"
#include "boost/shared_ptr.hpp"
#include "boost/tuple/tuple.hpp" // for boost::tie
#include <algorithm> // for std::copy
#include <iostream>
#include <vector>
typedef boost::shared_container_iterator< std::vector<int> > iterator;
std::pair<iterator,iterator>
return_range() {
boost::shared_ptr< std::vector<int> > range(new std::vector<int>());
range->push_back(0);
range->push_back(1);
range->push_back(2);
range->push_back(3);
range->push_back(4);
range->push_back(5);
return boost::make_shared_container_range(range);
}
int main() {
iterator i,end;
boost::tie(i,end) = return_range();
std::copy(i,end,std::ostream_iterator<int>(std::cout,","));
std::cout.put('\n');
return 0;
}

View File

@ -1,4 +1,4 @@
// (C) Copyright Jeremy Siek 2000-2004. // (C) Copyright Jeremy Siek 2000-2004.
// Distributed under the Boost Software License, Version 1.0. (See // Distributed under the Boost Software License, Version 1.0. (See
// accompanying file LICENSE_1_0.txt or copy at // accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt) // http://www.boost.org/LICENSE_1_0.txt)
@ -15,11 +15,10 @@
namespace boost { namespace boost {
template <class Operation> template <class Operation>
class binder1st { class binder1st
public: : public std::unary_function<typename Operation::second_argument_type,
typedef typename Operation::result_type result_type; typename Operation::result_type> {
typedef typename Operation::second_argument_type argument_type;
protected: protected:
Operation op; Operation op;
typename Operation::first_argument_type value; typename Operation::first_argument_type value;
@ -30,7 +29,7 @@ namespace boost {
: op(x), value(y) {} : op(x), value(y) {}
typename Operation::result_type typename Operation::result_type
operator()(const typename Operation::second_argument_type& x) const { operator()(const typename Operation::second_argument_type& x) const {
return op(value, x); return op(value, x);
} }
}; };
@ -70,6 +69,8 @@ main(int, char*[])
boost::make_transform_iterator(x + N, boost::bind1st(std::plus<int>(), 4)), boost::make_transform_iterator(x + N, boost::bind1st(std::plus<int>(), 4)),
std::ostream_iterator<int>(std::cout, " ")); std::ostream_iterator<int>(std::cout, " "));
std::cout << std::endl; std::cout << std::endl;
return 0; return 0;
} }

View File

@ -1,18 +1,56 @@
// (C) Copyright Andrey Semashev 2017. // (C) Copyright Jeremy Siek 2001.
// Distributed under the Boost Software License, Version 1.0. (See // Distributed under the Boost Software License, Version 1.0. (See
// accompanying file LICENSE_1_0.txt or copy at // accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt) // http://www.boost.org/LICENSE_1_0.txt)
// Revision History:
// 27 Feb 2001 Jeremy Siek
// Initial checkin.
#ifndef BOOST_FUNCTION_OUTPUT_ITERATOR_HPP #ifndef BOOST_FUNCTION_OUTPUT_ITERATOR_HPP
#define BOOST_FUNCTION_OUTPUT_ITERATOR_HPP #define BOOST_FUNCTION_OUTPUT_ITERATOR_HPP
// This is a deprecated header left for backward compatibility. #include <iterator>
// Use boost/iterator/function_output_iterator.hpp instead.
#include <boost/config/header_deprecated.hpp> namespace boost {
BOOST_HEADER_DEPRECATED("<boost/iterator/function_output_iterator.hpp>") template <class UnaryFunction>
class function_output_iterator {
typedef function_output_iterator self;
public:
typedef std::output_iterator_tag iterator_category;
typedef void value_type;
typedef void difference_type;
typedef void pointer;
typedef void reference;
#include <boost/iterator/function_output_iterator.hpp> explicit function_output_iterator() {}
explicit function_output_iterator(const UnaryFunction& f)
: m_f(f) {}
struct output_proxy {
output_proxy(UnaryFunction& f) : m_f(f) { }
template <class T> output_proxy& operator=(const T& value) {
m_f(value);
return *this;
}
UnaryFunction& m_f;
};
output_proxy operator*() { return output_proxy(m_f); }
self& operator++() { return *this; }
self& operator++(int) { return *this; }
private:
UnaryFunction m_f;
};
template <class UnaryFunction>
inline function_output_iterator<UnaryFunction>
make_function_output_iterator(const UnaryFunction& f = UnaryFunction()) {
return function_output_iterator<UnaryFunction>(f);
}
} // namespace boost
#endif // BOOST_FUNCTION_OUTPUT_ITERATOR_HPP #endif // BOOST_FUNCTION_OUTPUT_ITERATOR_HPP

View File

@ -1,14 +0,0 @@
// (C) Copyright Andrey Semashev 2025.
// Distributed under the Boost Software License, Version 1.0. (See
// accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
#ifndef BOOST_ITERATOR_ADAPTOR_GENERATOR_ITERATOR_HPP
#define BOOST_ITERATOR_ADAPTOR_GENERATOR_ITERATOR_HPP
// This is a deprecated header left for backward compatibility.
// Please use <boost/iterator/generator_iterator.hpp> instead.
#include <boost/iterator/generator_iterator.hpp>
#endif // BOOST_ITERATOR_ADAPTOR_GENERATOR_ITERATOR_HPP

View File

@ -1,46 +0,0 @@
#ifndef BOOST_INDIRECT_REFERENCE_DWA200415_HPP
#define BOOST_INDIRECT_REFERENCE_DWA200415_HPP
//
// Copyright David Abrahams 2004. Use, modification and distribution is
// subject to the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
// typename indirect_reference<P>::type provides the type of *p.
//
// http://www.boost.org/libs/iterator/doc/pointee.html
//
#include <type_traits>
#include <boost/detail/is_incrementable.hpp>
#include <boost/iterator/iterator_traits.hpp>
#include <boost/pointee.hpp>
namespace boost {
namespace detail {
template< typename P >
struct smart_ptr_reference
{
using type = boost::pointee_t< P >&;
};
} // namespace detail
template< typename P >
struct indirect_reference :
std::conditional<
detail::is_incrementable< P >::value,
iterator_reference< P >,
detail::smart_ptr_reference< P >
>::type
{
};
template< typename P >
using indirect_reference_t = typename indirect_reference< P >::type;
} // namespace boost
#endif // BOOST_INDIRECT_REFERENCE_DWA200415_HPP

View File

@ -0,0 +1,59 @@
// iterator.hpp workarounds for non-conforming standard libraries ---------//
// (C) Copyright Beman Dawes 2000. Distributed under the Boost
// Software License, Version 1.0. (See accompanying file
// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
// See http://www.boost.org/libs/utility for documentation.
// Revision History
// 12 Jan 01 added <cstddef> for std::ptrdiff_t (Jens Maurer)
// 28 Jun 00 Workarounds to deal with known MSVC bugs (David Abrahams)
// 26 Jun 00 Initial version (Jeremy Siek)
#ifndef BOOST_ITERATOR_HPP
#define BOOST_ITERATOR_HPP
#include <iterator>
#include <cstddef> // std::ptrdiff_t
#include <boost/config.hpp>
namespace boost
{
# if defined(BOOST_NO_STD_ITERATOR) && !defined(BOOST_MSVC_STD_ITERATOR)
template <class Category, class T,
class Distance = std::ptrdiff_t,
class Pointer = T*, class Reference = T&>
struct iterator
{
typedef T value_type;
typedef Distance difference_type;
typedef Pointer pointer;
typedef Reference reference;
typedef Category iterator_category;
};
# else
// declare iterator_base in namespace detail to work around MSVC bugs which
// prevent derivation from an identically-named class in a different namespace.
namespace detail {
template <class Category, class T, class Distance, class Pointer, class Reference>
# if !defined(BOOST_MSVC_STD_ITERATOR)
struct iterator_base : std::iterator<Category, T, Distance, Pointer, Reference> {};
# else
struct iterator_base : std::iterator<Category, T, Distance>
{
typedef Reference reference;
typedef Pointer pointer;
typedef Distance difference_type;
};
# endif
}
template <class Category, class T, class Distance = std::ptrdiff_t,
class Pointer = T*, class Reference = T&>
struct iterator : boost::detail::iterator_base<Category, T, Distance, Pointer, Reference> {};
# endif
} // namespace boost
#endif // BOOST_ITERATOR_HPP

View File

@ -1,74 +0,0 @@
// Copyright (C) 2017 Michel Morin.
//
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
#ifndef BOOST_ITERATOR_ADVANCE_HPP
#define BOOST_ITERATOR_ADVANCE_HPP
#include <boost/config.hpp>
#include <boost/iterator/iterator_categories.hpp>
namespace boost {
namespace iterators {
namespace detail {
template< typename InputIterator, typename Distance >
inline BOOST_CXX14_CONSTEXPR void advance_impl(InputIterator& it, Distance n, incrementable_traversal_tag)
{
while (n > 0)
{
++it;
--n;
}
}
template< typename BidirectionalIterator, typename Distance >
inline BOOST_CXX14_CONSTEXPR void advance_impl(BidirectionalIterator& it, Distance n, bidirectional_traversal_tag)
{
if (n >= 0)
{
while (n > 0)
{
++it;
--n;
}
}
else
{
while (n < 0)
{
--it;
++n;
}
}
}
template< typename RandomAccessIterator, typename Distance >
inline BOOST_CXX14_CONSTEXPR void advance_impl(RandomAccessIterator& it, Distance n, random_access_traversal_tag)
{
it += n;
}
} // namespace detail
namespace advance_adl_barrier {
template< typename InputIterator, typename Distance >
inline BOOST_CXX14_CONSTEXPR void advance(InputIterator& it, Distance n)
{
detail::advance_impl(it, n, typename iterator_traversal< InputIterator >::type());
}
} // namespace advance_adl_barrier
using namespace advance_adl_barrier;
} // namespace iterators
using namespace iterators::advance_adl_barrier;
} // namespace boost
#endif

View File

@ -2,219 +2,214 @@
// Distributed under the Boost Software License, Version 1.0. (See // Distributed under the Boost Software License, Version 1.0. (See
// accompanying file LICENSE_1_0.txt or copy at // accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt) // http://www.boost.org/LICENSE_1_0.txt)
#ifndef BOOST_ITERATOR_COUNTING_ITERATOR_DWA200348_HPP #ifndef COUNTING_ITERATOR_DWA200348_HPP
#define BOOST_ITERATOR_COUNTING_ITERATOR_DWA200348_HPP # define COUNTING_ITERATOR_DWA200348_HPP
#include <limits> # include <boost/iterator/iterator_adaptor.hpp>
#include <type_traits> # include <boost/detail/numeric_traits.hpp>
# include <boost/mpl/bool.hpp>
#include <boost/config.hpp> # include <boost/mpl/if.hpp>
#include <boost/core/use_default.hpp> # include <boost/mpl/identity.hpp>
#include <boost/detail/numeric_traits.hpp> # include <boost/mpl/eval_if.hpp>
#include <boost/iterator/iterator_adaptor.hpp>
#include <boost/iterator/iterator_categories.hpp>
#include <boost/iterator/detail/if_default.hpp>
#include <boost/iterator/detail/eval_if_default.hpp>
#include <boost/iterator/detail/type_traits/type_identity.hpp>
namespace boost { namespace boost {
namespace iterators {
template< template <
typename Incrementable, class Incrementable
typename CategoryOrTraversal, , class CategoryOrTraversal
typename Difference , class Difference
> >
class counting_iterator; class counting_iterator;
namespace detail { namespace detail
// Try to detect numeric types at compile time in ways compatible
// with the limitations of the compiler and library.
template< typename T >
struct is_numeric :
public std::integral_constant< bool, std::numeric_limits< T >::is_specialized >
{};
template<>
struct is_numeric< long long > :
public std::true_type
{};
template<>
struct is_numeric< unsigned long long > :
public std::true_type
{};
#if defined(BOOST_HAS_INT128)
template<>
struct is_numeric< boost::int128_type > :
public std::true_type
{};
template<>
struct is_numeric< boost::uint128_type > :
public std::true_type
{};
#endif
// Some compilers fail to have a numeric_limits specialization
template<>
struct is_numeric< wchar_t > :
public std::true_type
{};
template< typename T >
struct numeric_difference
{ {
using type = typename boost::detail::numeric_traits< T >::difference_type; // Try to detect numeric types at compile time in ways compatible
}; // with the limitations of the compiler and library.
template <class T>
struct is_numeric_impl
{
// For a while, this wasn't true, but we rely on it below. This is a regression assert.
BOOST_STATIC_ASSERT(::boost::is_integral<char>::value);
# ifndef BOOST_NO_LIMITS_COMPILE_TIME_CONSTANTS
BOOST_STATIC_CONSTANT(bool, value = std::numeric_limits<T>::is_specialized);
# else
# if !BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x551))
BOOST_STATIC_CONSTANT(
bool, value = (
boost::is_convertible<int,T>::value
&& boost::is_convertible<T,int>::value
));
# else
BOOST_STATIC_CONSTANT(bool, value = ::boost::is_arithmetic<T>::value);
# endif
# endif
};
#if defined(BOOST_HAS_INT128) template <class T>
// std::numeric_limits, which is used by numeric_traits, is not specialized for __int128 in some standard libraries struct is_numeric
template<> : mpl::bool_<(::boost::detail::is_numeric_impl<T>::value)>
struct numeric_difference< boost::int128_type > {};
{
using type = boost::int128_type;
};
template<> # if defined(BOOST_HAS_LONG_LONG)
struct numeric_difference< boost::uint128_type > template <>
{ struct is_numeric< ::boost::long_long_type>
using type = boost::int128_type; : mpl::true_ {};
};
#endif template <>
struct is_numeric< ::boost::ulong_long_type>
: mpl::true_ {};
# endif
template< typename Incrementable, typename CategoryOrTraversal, typename Difference, bool IsNumeric = is_numeric< Incrementable >::value > // Some compilers fail to have a numeric_limits specialization
struct counting_iterator_types template <>
{ struct is_numeric<wchar_t>
using traversal = detail::eval_if_default_t< : mpl::true_ {};
CategoryOrTraversal,
iterator_traversal< Incrementable > template <class T>
>; struct numeric_difference
{
typedef typename boost::detail::numeric_traits<T>::difference_type type;
};
using difference = detail::eval_if_default_t< BOOST_STATIC_ASSERT(is_numeric<int>::value);
Difference,
iterator_difference< Incrementable > template <class Incrementable, class CategoryOrTraversal, class Difference>
>; struct counting_iterator_base
}; {
typedef typename detail::ia_dflt_help<
CategoryOrTraversal
, mpl::eval_if<
is_numeric<Incrementable>
, mpl::identity<random_access_traversal_tag>
, iterator_traversal<Incrementable>
>
>::type traversal;
typedef typename detail::ia_dflt_help<
Difference
, mpl::eval_if<
is_numeric<Incrementable>
, numeric_difference<Incrementable>
, iterator_difference<Incrementable>
>
>::type difference;
typedef iterator_adaptor<
counting_iterator<Incrementable, CategoryOrTraversal, Difference> // self
, Incrementable // Base
, Incrementable // Value
# ifndef BOOST_ITERATOR_REF_CONSTNESS_KILLS_WRITABILITY
const // MSVC won't strip this. Instead we enable Thomas'
// criterion (see boost/iterator/detail/facade_iterator_category.hpp)
# endif
, traversal
, Incrementable const& // reference
, difference
> type;
};
template< typename Incrementable, typename CategoryOrTraversal, typename Difference > // Template class distance_policy_select -- choose a policy for computing the
struct counting_iterator_types< Incrementable, CategoryOrTraversal, Difference, true > // distance between counting_iterators at compile-time based on whether or not
{ // the iterator wraps an integer or an iterator, using "poor man's partial
using traversal = detail::if_default_t< // specialization".
CategoryOrTraversal,
random_access_traversal_tag
>;
using difference = detail::eval_if_default_t< template <bool is_integer> struct distance_policy_select;
Difference,
numeric_difference< Incrementable >
>;
};
template< typename Incrementable, typename CategoryOrTraversal, typename Difference > // A policy for wrapped iterators
struct counting_iterator_base template <class Difference, class Incrementable1, class Incrementable2>
{ struct iterator_distance
using iterator_types = counting_iterator_types< Incrementable, CategoryOrTraversal, Difference >; {
static Difference distance(Incrementable1 x, Incrementable2 y)
{
return y - x;
}
};
using type = iterator_adaptor< // A policy for wrapped numbers
counting_iterator< Incrementable, CategoryOrTraversal, Difference >, // self template <class Difference, class Incrementable1, class Incrementable2>
Incrementable, // Base struct number_distance
#ifndef BOOST_ITERATOR_REF_CONSTNESS_KILLS_WRITABILITY {
const // MSVC won't strip this. Instead we enable Thomas' static Difference distance(Incrementable1 x, Incrementable2 y)
// criterion (see boost/iterator/detail/facade_iterator_category.hpp) {
#endif return numeric_distance(x, y);
Incrementable, // Value }
typename iterator_types::traversal, };
Incrementable const&, // reference }
typename iterator_types::difference
>;
};
// A distance calculation policy for wrapped iterators template <
template< typename Difference, typename Incrementable1, typename Incrementable2 > class Incrementable
struct iterator_distance , class CategoryOrTraversal = use_default
{ , class Difference = use_default
static Difference distance(Incrementable1 x, Incrementable2 y)
{
return y - x;
}
};
// A distance calculation policy for wrapped numbers
template< typename Difference, typename Incrementable1, typename Incrementable2 >
struct number_distance
{
static Difference distance(Incrementable1 x, Incrementable2 y)
{
return boost::detail::numeric_distance(x, y);
}
};
} // namespace detail
template<
typename Incrementable,
typename CategoryOrTraversal = use_default,
typename Difference = use_default
> >
class counting_iterator : class counting_iterator
public detail::counting_iterator_base< Incrementable, CategoryOrTraversal, Difference >::type : public detail::counting_iterator_base<
Incrementable, CategoryOrTraversal, Difference
>::type
{ {
typedef typename detail::counting_iterator_base<
Incrementable, CategoryOrTraversal, Difference
>::type super_t;
friend class iterator_core_access; friend class iterator_core_access;
private: public:
using super_t = typename detail::counting_iterator_base< typedef typename super_t::difference_type difference_type;
Incrementable, CategoryOrTraversal, Difference
>::type;
public: counting_iterator() { }
using reference = typename super_t::reference;
using difference_type = typename super_t::difference_type; counting_iterator(counting_iterator const& rhs) : super_t(rhs.base()) {}
counting_iterator() = default; counting_iterator(Incrementable x)
: super_t(x)
counting_iterator(counting_iterator const&) = default;
counting_iterator& operator=(counting_iterator const&) = default;
counting_iterator(Incrementable x) :
super_t(x)
{ {
} }
private: # if 0
reference dereference() const template<class OtherIncrementable>
counting_iterator(
counting_iterator<OtherIncrementable, CategoryOrTraversal, Difference> const& t
, typename enable_if_convertible<OtherIncrementable, Incrementable>::type* = 0
)
: super_t(t.base())
{}
# endif
private:
typename super_t::reference dereference() const
{ {
return this->base_reference(); return this->base_reference();
} }
template< typename OtherIncrementable > template <class OtherIncrementable>
difference_type difference_type
distance_to(counting_iterator< OtherIncrementable, CategoryOrTraversal, Difference > const& y) const distance_to(counting_iterator<OtherIncrementable, CategoryOrTraversal, Difference> const& y) const
{ {
using distance_traits = typename std::conditional< typedef typename mpl::if_<
detail::is_numeric< Incrementable >::value, detail::is_numeric<Incrementable>
detail::number_distance< difference_type, Incrementable, OtherIncrementable >, , detail::number_distance<difference_type, Incrementable, OtherIncrementable>
detail::iterator_distance< difference_type, Incrementable, OtherIncrementable > , detail::iterator_distance<difference_type, Incrementable, OtherIncrementable>
>::type; >::type d;
return distance_traits::distance(this->base(), y.base()); return d::distance(this->base(), y.base());
} }
}; };
// Manufacture a counting iterator for an arbitrary incrementable type // Manufacture a counting iterator for an arbitrary incrementable type
template< typename Incrementable > template <class Incrementable>
inline counting_iterator< Incrementable > make_counting_iterator(Incrementable x) inline counting_iterator<Incrementable>
make_counting_iterator(Incrementable x)
{ {
return counting_iterator< Incrementable >(x); typedef counting_iterator<Incrementable> result_t;
return result_t(x);
} }
} // namespace iterators
using iterators::counting_iterator; } // namespace boost::iterator
using iterators::make_counting_iterator;
} // namespace boost #endif // COUNTING_ITERATOR_DWA200348_HPP
#endif // BOOST_ITERATOR_COUNTING_ITERATOR_DWA200348_HPP

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@ -0,0 +1,19 @@
// Copyright David Abrahams 2003. Use, modification and distribution is
// subject to the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
#ifndef ANY_CONVERSION_EATER_DWA20031117_HPP
# define ANY_CONVERSION_EATER_DWA20031117_HPP
namespace boost { namespace detail {
// This type can be used in traits to "eat" up the one user-defined
// implicit conversion allowed.
struct any_conversion_eater
{
template <class T>
any_conversion_eater(T const&);
};
}} // namespace boost::detail
#endif // ANY_CONVERSION_EATER_DWA20031117_HPP

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@ -18,14 +18,16 @@
#ifdef BOOST_ITERATOR_CONFIG_DEF #ifdef BOOST_ITERATOR_CONFIG_DEF
# error you have nested config_def #inclusion. # error you have nested config_def #inclusion.
#else #else
# define BOOST_ITERATOR_CONFIG_DEF # define BOOST_ITERATOR_CONFIG_DEF
#endif #endif
// We enable this always now. Otherwise, the simple case in // We enable this always now. Otherwise, the simple case in
// libs/iterator/test/constant_iterator_arrow.cpp fails to compile // libs/iterator/test/constant_iterator_arrow.cpp fails to compile
// because the operator-> return is improperly deduced as a non-const // because the operator-> return is improperly deduced as a non-const
// pointer. // pointer.
#if 1 || defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION) \
|| BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x531))
// Recall that in general, compilers without partial specialization // Recall that in general, compilers without partial specialization
// can't strip constness. Consider counting_iterator, which normally // can't strip constness. Consider counting_iterator, which normally
@ -42,4 +44,94 @@
# define BOOST_ITERATOR_REF_CONSTNESS_KILLS_WRITABILITY 1 # define BOOST_ITERATOR_REF_CONSTNESS_KILLS_WRITABILITY 1
#endif
#if BOOST_WORKAROUND(BOOST_MSVC, <= 1300) \
|| BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x5A0)) \
|| (BOOST_WORKAROUND(BOOST_INTEL_CXX_VERSION, <= 700) && defined(_MSC_VER)) \
|| BOOST_WORKAROUND(__DECCXX_VER, BOOST_TESTED_AT(60590042)) \
|| BOOST_WORKAROUND(__SUNPRO_CC, BOOST_TESTED_AT(0x590))
# define BOOST_NO_LVALUE_RETURN_DETECTION
# if 0 // test code
struct v {};
typedef char (&no)[3];
template <class T>
no foo(T const&, ...);
template <class T>
char foo(T&, int);
struct value_iterator
{
v operator*() const;
};
template <class T>
struct lvalue_deref_helper
{
static T& x;
enum { value = (sizeof(foo(*x,0)) == 1) };
};
int z2[(lvalue_deref_helper<v*>::value == 1) ? 1 : -1];
int z[(lvalue_deref_helper<value_iterator>::value) == 1 ? -1 : 1 ];
# endif
#endif
#if BOOST_WORKAROUND(__MWERKS__, <=0x2407)
# define BOOST_NO_IS_CONVERTIBLE // "is_convertible doesn't work for simple types"
#endif
#if BOOST_WORKAROUND(__GNUC__, == 2) \
|| BOOST_WORKAROUND(__GNUC__, == 3) && BOOST_WORKAROUND(__GNUC_MINOR__, < 4) && !defined(__EDG_VERSION__) \
|| BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x551))
# define BOOST_NO_IS_CONVERTIBLE_TEMPLATE // The following program fails to compile:
# if 0 // test code
#include <boost/type_traits/is_convertible.hpp>
template <class T>
struct foo
{
foo(T);
template <class U>
foo(foo<U> const& other) : p(other.p) { }
T p;
};
bool x = boost::is_convertible<foo<int const*>, foo<int*> >::value;
# endif
#endif
#if !defined(BOOST_MSVC) && (defined(BOOST_NO_SFINAE) || defined(BOOST_NO_IS_CONVERTIBLE) || defined(BOOST_NO_IS_CONVERTIBLE_TEMPLATE))
# define BOOST_NO_STRICT_ITERATOR_INTEROPERABILITY
#endif
# if !BOOST_WORKAROUND(BOOST_MSVC, <= 1300)
# define BOOST_ARG_DEPENDENT_TYPENAME typename
# else
# define BOOST_ARG_DEPENDENT_TYPENAME
# endif
# if BOOST_WORKAROUND(__GNUC__, == 2) && BOOST_WORKAROUND(__GNUC_MINOR__, BOOST_TESTED_AT(95)) \
|| BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x564))
// GCC-2.95 eagerly instantiates templated constructors and conversion
// operators in convertibility checks, causing premature errors.
//
// Borland's problems are harder to diagnose due to lack of an
// instantiation stack backtrace. They may be due in part to the fact
// that it drops cv-qualification willy-nilly in templates.
# define BOOST_NO_ONE_WAY_ITERATOR_INTEROP
# endif
// no include guard; multiple inclusion intended // no include guard; multiple inclusion intended

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@ -11,10 +11,15 @@
// 23/02/03 thw // 23/02/03 thw
// //
#undef BOOST_ITERATOR_REF_CONSTNESS_KILLS_WRITABILITY #undef BOOST_NO_IS_CONVERTIBLE
#undef BOOST_NO_IS_CONVERTIBLE_TEMPLATE
#undef BOOST_NO_STRICT_ITERATOR_INTEROPERABILITY
#undef BOOST_ARG_DEPENDENT_TYPENAME
#undef BOOST_NO_LVALUE_RETURN_DETECTION
#undef BOOST_NO_ONE_WAY_ITERATOR_INTEROP
#ifdef BOOST_ITERATOR_CONFIG_DEF #ifdef BOOST_ITERATOR_CONFIG_DEF
# undef BOOST_ITERATOR_CONFIG_DEF # undef BOOST_ITERATOR_CONFIG_DEF
#else #else
# error missing or nested #include config_def # error missing or nested #include config_def
#endif #endif

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@ -0,0 +1,86 @@
// (C) Copyright David Abrahams 2002.
// (C) Copyright Jeremy Siek 2002.
// (C) Copyright Thomas Witt 2002.
// Distributed under the Boost Software License, Version 1.0. (See
// accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
#ifndef BOOST_ENABLE_IF_23022003THW_HPP
#define BOOST_ENABLE_IF_23022003THW_HPP
#include <boost/detail/workaround.hpp>
#include <boost/mpl/identity.hpp>
#include <boost/iterator/detail/config_def.hpp>
//
// Boost iterators uses its own enable_if cause we need
// special semantics for deficient compilers.
// 23/02/03 thw
//
namespace boost
{
namespace iterators
{
//
// Base machinery for all kinds of enable if
//
template<bool>
struct enabled
{
template<typename T>
struct base
{
typedef T type;
};
};
//
// For compilers that don't support "Substitution Failure Is Not An Error"
// enable_if falls back to always enabled. See comments
// on operator implementation for consequences.
//
template<>
struct enabled<false>
{
template<typename T>
struct base
{
#ifdef BOOST_NO_SFINAE
typedef T type;
// This way to do it would give a nice error message containing
// invalid overload, but has the big disadvantage that
// there is no reference to user code in the error message.
//
// struct invalid_overload;
// typedef invalid_overload type;
//
#endif
};
};
template <class Cond,
class Return>
struct enable_if
# if !defined(BOOST_NO_SFINAE) && !defined(BOOST_NO_IS_CONVERTIBLE)
: enabled<(Cond::value)>::template base<Return>
# else
: mpl::identity<Return>
# endif
{
# if BOOST_WORKAROUND(BOOST_MSVC, < 1300)
typedef Return type;
# endif
};
} // namespace iterators
} // namespace boost
#include <boost/iterator/detail/config_undef.hpp>
#endif // BOOST_ENABLE_IF_23022003THW_HPP

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@ -1,44 +0,0 @@
/*
* Distributed under the Boost Software License, Version 1.0.
* (See accompanying file LICENSE_1_0.txt or copy at
* https://www.boost.org/LICENSE_1_0.txt)
*
* Copyright (c) 2025 Andrey Semashev
*/
#ifndef BOOST_ITERATOR_DETAIL_EVAL_IF_DEFAULT_HPP_INCLUDED_
#define BOOST_ITERATOR_DETAIL_EVAL_IF_DEFAULT_HPP_INCLUDED_
#include <boost/core/use_default.hpp>
#include <boost/iterator/detail/type_traits/type_identity.hpp>
namespace boost {
namespace iterators {
namespace detail {
// If T is use_default, return the result of invoking
// DefaultNullaryFn, otherwise - of NondefaultNullaryFn.
// By default, NondefaultNullaryFn returns T, which means
// the metafunction can be called with just two parameters
// and in that case will return either T or the result of
// invoking DefaultNullaryFn.
template< typename T, typename DefaultNullaryFn, typename NondefaultNullaryFn = detail::type_identity< T > >
struct eval_if_default
{
using type = typename NondefaultNullaryFn::type;
};
template< typename DefaultNullaryFn, typename NondefaultNullaryFn >
struct eval_if_default< use_default, DefaultNullaryFn, NondefaultNullaryFn >
{
using type = typename DefaultNullaryFn::type;
};
template< typename T, typename DefaultNullaryFn, typename NondefaultNullaryFn = detail::type_identity< T > >
using eval_if_default_t = typename eval_if_default< T, DefaultNullaryFn, NondefaultNullaryFn >::type;
} // namespace detail
} // namespace iterators
} // namespace boost
#endif // BOOST_ITERATOR_DETAIL_EVAL_IF_DEFAULT_HPP_INCLUDED_

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@ -2,178 +2,199 @@
// subject to the Boost Software License, Version 1.0. (See accompanying // subject to the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
#ifndef FACADE_ITERATOR_CATEGORY_DWA20031118_HPP #ifndef FACADE_ITERATOR_CATEGORY_DWA20031118_HPP
#define FACADE_ITERATOR_CATEGORY_DWA20031118_HPP # define FACADE_ITERATOR_CATEGORY_DWA20031118_HPP
#include <iterator> # include <boost/iterator/iterator_categories.hpp>
#include <type_traits>
#include <boost/mp11/utility.hpp> # include <boost/mpl/or.hpp> // used in iterator_tag inheritance logic
# include <boost/mpl/and.hpp>
# include <boost/mpl/if.hpp>
# include <boost/mpl/eval_if.hpp>
# include <boost/mpl/identity.hpp>
# include <boost/mpl/assert.hpp>
#include <boost/iterator/iterator_categories.hpp> # include <boost/type_traits/is_same.hpp>
#include <boost/iterator/detail/type_traits/conjunction.hpp> # include <boost/type_traits/is_const.hpp>
#include <boost/iterator/detail/type_traits/disjunction.hpp> # include <boost/type_traits/is_reference.hpp>
#include <boost/iterator/detail/config_def.hpp> // try to keep this last # include <boost/type_traits/is_convertible.hpp>
# include <boost/type_traits/is_same.hpp>
# include <boost/iterator/detail/config_def.hpp> // try to keep this last
# ifdef BOOST_ITERATOR_REF_CONSTNESS_KILLS_WRITABILITY
# include <boost/detail/indirect_traits.hpp>
# endif
// //
// iterator_category deduction for iterator_facade // iterator_category deduction for iterator_facade
// //
namespace boost { // forward declaration
namespace iterators { namespace boost { struct use_default; }
namespace detail {
#ifdef BOOST_ITERATOR_REF_CONSTNESS_KILLS_WRITABILITY namespace boost { namespace detail {
template< typename T > struct input_output_iterator_tag
struct is_const_lvalue_reference : : std::input_iterator_tag
public std::false_type {
{}; // Using inheritance for only input_iterator_tag helps to avoid
// ambiguities when a stdlib implementation dispatches on a
template< typename T > // function which is overloaded on both input_iterator_tag and
struct is_const_lvalue_reference< T const& > : // output_iterator_tag, as STLPort does, in its __valid_range
public std::true_type // function. I claim it's better to avoid the ambiguity in these
{}; // cases.
operator std::output_iterator_tag() const
#endif // BOOST_ITERATOR_REF_CONSTNESS_KILLS_WRITABILITY {
return std::output_iterator_tag();
}
};
// //
// True iff the user has explicitly disabled writability of this // True iff the user has explicitly disabled writability of this
// iterator. Pass the iterator_facade's Value parameter and its // iterator. Pass the iterator_facade's Value parameter and its
// nested ::reference type. // nested ::reference type.
// //
template< typename ValueParam, typename Reference > template <class ValueParam, class Reference>
struct iterator_writability_disabled : struct iterator_writability_disabled
# ifdef BOOST_ITERATOR_REF_CONSTNESS_KILLS_WRITABILITY // Adding Thomas' logic? # ifdef BOOST_ITERATOR_REF_CONSTNESS_KILLS_WRITABILITY // Adding Thomas' logic?
public detail::disjunction< : mpl::or_<
detail::is_const_lvalue_reference< Reference >, is_const<Reference>
std::is_const< Reference >, , boost::detail::indirect_traits::is_reference_to_const<Reference>
std::is_const< ValueParam > , is_const<ValueParam>
> >
# else # else
public std::is_const< ValueParam > : is_const<ValueParam>
# endif # endif
{}; {};
template< typename Traversal, typename ValueParam, typename Reference >
using is_traversal_of_input_iterator = detail::conjunction<
std::is_convertible< Traversal, single_pass_traversal_tag >,
// check for readability
std::is_convertible< Reference, ValueParam >
>;
// //
// Convert an iterator_facade's traversal category, Value parameter, // Convert an iterator_facade's traversal category, Value parameter,
// and ::reference type to an appropriate old-style category. // and ::reference type to an appropriate old-style category.
// //
// Due to changeset 21683, this now never results in a category convertible // If writability has been disabled per the above metafunction, the
// to output_iterator_tag. // result will not be convertible to output_iterator_tag.
// //
// Change at: https://svn.boost.org/trac/boost/changeset/21683 // Otherwise, if Traversal == single_pass_traversal_tag, the following
template< typename Traversal, typename ValueParam, typename Reference > // conditions will result in a tag that is convertible both to
// input_iterator_tag and output_iterator_tag:
//
// 1. Reference is a reference to non-const
// 2. Reference is not a reference and is convertible to Value
//
template <class Traversal, class ValueParam, class Reference>
struct iterator_facade_default_category struct iterator_facade_default_category
: mpl::eval_if<
mpl::and_<
is_reference<Reference>
, is_convertible<Traversal,forward_traversal_tag>
>
, mpl::eval_if<
is_convertible<Traversal,random_access_traversal_tag>
, mpl::identity<std::random_access_iterator_tag>
, mpl::if_<
is_convertible<Traversal,bidirectional_traversal_tag>
, std::bidirectional_iterator_tag
, std::forward_iterator_tag
>
>
, typename mpl::eval_if<
mpl::and_<
is_convertible<Traversal, single_pass_traversal_tag>
// check for readability
, is_convertible<Reference, ValueParam>
>
, mpl::identity<std::input_iterator_tag>
, mpl::identity<Traversal>
>
>
{ {
using type = typename std::conditional<
detail::is_traversal_of_input_iterator< Traversal, ValueParam, Reference >::value,
std::input_iterator_tag,
Traversal
>::type;
}; };
// Specialization for the (typical) case when the reference type is an actual reference
template< typename Traversal, typename ValueParam, typename Referenced >
struct iterator_facade_default_category< Traversal, ValueParam, Referenced& >
{
using type = mp11::mp_cond<
std::is_convertible< Traversal, random_access_traversal_tag >, std::random_access_iterator_tag,
std::is_convertible< Traversal, bidirectional_traversal_tag >, std::bidirectional_iterator_tag,
std::is_convertible< Traversal, forward_traversal_tag >, std::forward_iterator_tag,
detail::is_traversal_of_input_iterator< Traversal, ValueParam, Referenced& >, std::input_iterator_tag,
std::true_type, Traversal
>;
};
template< typename Traversal, typename ValueParam, typename Reference >
using iterator_facade_default_category_t = typename iterator_facade_default_category< Traversal, ValueParam, Reference >::type;
// True iff T is convertible to an old-style iterator category. // True iff T is convertible to an old-style iterator category.
template< typename T > template <class T>
struct is_iterator_category : struct is_iterator_category
public detail::disjunction< : mpl::or_<
std::is_convertible< T, std::input_iterator_tag >, is_convertible<T,std::input_iterator_tag>
std::is_convertible< T, std::output_iterator_tag > , is_convertible<T,std::output_iterator_tag>
> >
{}; {
};
template< typename T > template <class T>
struct is_iterator_traversal : struct is_iterator_traversal
public std::is_convertible< T, incrementable_traversal_tag > : is_convertible<T,incrementable_traversal_tag>
{}; {};
// //
// A composite iterator_category tag convertible to Category (a pure // A composite iterator_category tag convertible to Category (a pure
// old-style category) and Traversal (a pure traversal tag). // old-style category) and Traversal (a pure traversal tag).
// Traversal must be a strict increase of the traversal power given by // Traversal must be a strict increase of the traversal power given by
// Category. // Category.
// //
template< typename Category, typename Traversal > template <class Category, class Traversal>
struct iterator_category_with_traversal : struct iterator_category_with_traversal
public Category, : Category, Traversal
public Traversal
{ {
# if !BOOST_WORKAROUND(BOOST_MSVC, <= 1300)
// Make sure this isn't used to build any categories where // Make sure this isn't used to build any categories where
// convertibility to Traversal is redundant. Should just use the // convertibility to Traversal is redundant. Should just use the
// Category element in that case. // Category element in that case.
static_assert( BOOST_MPL_ASSERT_NOT((
!std::is_convertible< iterator_category_to_traversal_t< Category >, Traversal >::value, is_convertible<
"Category transformed to corresponding traversal must be convertible to Traversal." typename iterator_category_to_traversal<Category>::type
); , Traversal
>));
static_assert(is_iterator_category< Category >::value, "Category must be an STL iterator category."); BOOST_MPL_ASSERT((is_iterator_category<Category>));
static_assert(!is_iterator_category< Traversal >::value, "Traversal must not be an STL iterator category."); BOOST_MPL_ASSERT_NOT((is_iterator_category<Traversal>));
static_assert(!is_iterator_traversal< Category >::value, "Category must not be a traversal tag."); BOOST_MPL_ASSERT_NOT((is_iterator_traversal<Category>));
static_assert(is_iterator_traversal< Traversal >::value, "Traversal must be a traversal tag."); # if !BOOST_WORKAROUND(BOOST_MSVC, BOOST_TESTED_AT(1310))
BOOST_MPL_ASSERT((is_iterator_traversal<Traversal>));
# endif
# endif
}; };
// Computes an iterator_category tag whose traversal is Traversal and // Computes an iterator_category tag whose traversal is Traversal and
// which is appropriate for an iterator // which is appropriate for an iterator
template< typename Traversal, typename ValueParam, typename Reference > template <class Traversal, class ValueParam, class Reference>
struct facade_iterator_category_impl struct facade_iterator_category_impl
{ {
static_assert(!is_iterator_category< Traversal >::value, "Traversal must not be an STL iterator category."); # if !BOOST_WORKAROUND(BOOST_MSVC, <= 1300)
BOOST_MPL_ASSERT_NOT((is_iterator_category<Traversal>));
using category = iterator_facade_default_category_t< Traversal, ValueParam, Reference >; # endif
using type = typename std::conditional< typedef typename iterator_facade_default_category<
std::is_same< Traversal,ValueParam,Reference
Traversal, >::type category;
typename iterator_category_to_traversal< category >::type
>::value, typedef typename mpl::if_<
category, is_same<
iterator_category_with_traversal< category, Traversal > Traversal
>::type; , typename iterator_category_to_traversal<category>::type
>
, category
, iterator_category_with_traversal<category,Traversal>
>::type type;
}; };
template< typename Traversal, typename ValueParam, typename Reference >
using facade_iterator_category_impl_t = typename facade_iterator_category_impl< Traversal, ValueParam, Reference >::type;
// //
// Compute an iterator_category for iterator_facade // Compute an iterator_category for iterator_facade
// //
template< typename CategoryOrTraversal, typename ValueParam, typename Reference > template <class CategoryOrTraversal, class ValueParam, class Reference>
struct facade_iterator_category struct facade_iterator_category
: mpl::eval_if<
is_iterator_category<CategoryOrTraversal>
, mpl::identity<CategoryOrTraversal> // old-style categories are fine as-is
, facade_iterator_category_impl<CategoryOrTraversal,ValueParam,Reference>
>
{ {
using type = mp11::mp_eval_if<
is_iterator_category< CategoryOrTraversal >,
CategoryOrTraversal, // old-style categories are fine as-is
facade_iterator_category_impl_t, CategoryOrTraversal, ValueParam, Reference
>;
}; };
}}} // namespace boost::iterators::detail }} // namespace boost::detail
#include <boost/iterator/detail/config_undef.hpp> # include <boost/iterator/detail/config_undef.hpp>
#endif // FACADE_ITERATOR_CATEGORY_DWA20031118_HPP #endif // FACADE_ITERATOR_CATEGORY_DWA20031118_HPP

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@ -1,41 +0,0 @@
/*
* Distributed under the Boost Software License, Version 1.0.
* (See accompanying file LICENSE_1_0.txt or copy at
* https://www.boost.org/LICENSE_1_0.txt)
*
* Copyright (c) 2025 Andrey Semashev
*/
#ifndef BOOST_ITERATOR_DETAIL_IF_DEFAULT_HPP_INCLUDED_
#define BOOST_ITERATOR_DETAIL_IF_DEFAULT_HPP_INCLUDED_
#include <boost/core/use_default.hpp>
namespace boost {
namespace iterators {
namespace detail {
// If T is use_default, return Default, otherwise - Nondefault.
// By default, Nondefault is T, which means
// the metafunction can be called with just two parameters
// and in that case will return either T or Default.
template< typename T, typename Default, typename Nondefault = T >
struct if_default
{
using type = Nondefault;
};
template< typename Default, typename Nondefault >
struct if_default< use_default, Default, Nondefault >
{
using type = Default;
};
template< typename T, typename Default, typename Nondefault = T >
using if_default_t = typename if_default< T, Default, Nondefault >::type;
} // namespace detail
} // namespace iterators
} // namespace boost
#endif // BOOST_ITERATOR_DETAIL_IF_DEFAULT_HPP_INCLUDED_

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@ -0,0 +1,116 @@
// Copyright David Abrahams 2003. Use, modification and distribution is
// subject to the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
#ifndef MINIMUM_CATEGORY_DWA20031119_HPP
# define MINIMUM_CATEGORY_DWA20031119_HPP
# include <boost/type_traits/is_convertible.hpp>
# include <boost/type_traits/is_same.hpp>
# include <boost/mpl/aux_/lambda_support.hpp>
namespace boost { namespace detail {
//
// Returns the minimum category type or error_type
// if T1 and T2 are unrelated.
//
// For compilers not supporting is_convertible this only
// works with the new boost return and traversal category
// types. The exact boost _types_ are required. No derived types
// will work.
//
//
template <bool GreaterEqual, bool LessEqual>
struct minimum_category_impl
# if BOOST_WORKAROUND(BOOST_MSVC, < 1300)
{
template <class T1, class T2> struct apply
{
typedef T2 type;
};
typedef void type;
}
# endif
;
template <class T1, class T2>
struct error_not_related_by_convertibility;
template <>
struct minimum_category_impl<true,false>
{
template <class T1, class T2> struct apply
{
typedef T2 type;
};
};
template <>
struct minimum_category_impl<false,true>
{
template <class T1, class T2> struct apply
{
typedef T1 type;
};
};
template <>
struct minimum_category_impl<true,true>
{
template <class T1, class T2> struct apply
{
BOOST_STATIC_ASSERT((is_same<T1,T2>::value));
typedef T1 type;
};
};
template <>
struct minimum_category_impl<false,false>
{
template <class T1, class T2> struct apply
: error_not_related_by_convertibility<T1,T2>
{
};
};
template <class T1 = mpl::_1, class T2 = mpl::_2>
struct minimum_category
{
typedef minimum_category_impl<
# if BOOST_WORKAROUND(BOOST_MSVC, < 1300) // ETI workaround
is_same<T2,int>::value ||
# endif
::boost::is_convertible<T1,T2>::value
, ::boost::is_convertible<T2,T1>::value
# if BOOST_WORKAROUND(BOOST_MSVC, < 1300) // ETI workaround
|| is_same<T1,int>::value
# endif
> outer;
typedef typename outer::template apply<T1,T2> inner;
typedef typename inner::type type;
BOOST_MPL_AUX_LAMBDA_SUPPORT(2,minimum_category,(T1,T2))
};
template <>
struct minimum_category<mpl::_1,mpl::_2>
{
template <class T1, class T2>
struct apply : minimum_category<T1,T2>
{};
BOOST_MPL_AUX_LAMBDA_SUPPORT_SPEC(2,minimum_category,(mpl::_1,mpl::_2))
};
# if BOOST_WORKAROUND(BOOST_MSVC, < 1300) // ETI workaround
template <>
struct minimum_category<int,int>
{
typedef int type;
};
# endif
}} // namespace boost::detail
#endif // MINIMUM_CATEGORY_DWA20031119_HPP

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