Remove C++03 from Travis and Appveyor

.travis.yml

@@ -1,4 +1,4 @@
-# Copyright 2016, 2017, 2018 Peter Dimov
+# Copyright 2016-2019 Peter Dimov
 # 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)
 
@@ -6,6 +6,8 @@ language: cpp
 
 sudo: false
 
+dist: trusty
+
 branches:
   only:
     - master
@@ -24,11 +26,11 @@ matrix:
   include:
     - os: linux
       compiler: g++
-      env: TOOLSET=gcc CXXSTD=03,11 VARIANT=debug,release
+      env: TOOLSET=gcc CXXSTD=11
 
     - os: linux
       compiler: g++-4.4
-      env: TOOLSET=gcc CXXSTD=98,0x
+      env: TOOLSET=gcc CXXSTD=0x
       addons:
         apt:
           packages:
@@ -38,7 +40,7 @@ matrix:
 
     - os: linux
       compiler: g++-4.6
-      env: TOOLSET=gcc CXXSTD=03,0x
+      env: TOOLSET=gcc CXXSTD=0x
       addons:
         apt:
           packages:
@@ -48,7 +50,7 @@ matrix:
 
     - os: linux
       compiler: g++-4.7
-      env: TOOLSET=gcc CXXSTD=03,11
+      env: TOOLSET=gcc CXXSTD=11
       addons:
         apt:
           packages:
@@ -58,7 +60,7 @@ matrix:
 
     - os: linux
       compiler: g++-4.8
-      env: TOOLSET=gcc CXXSTD=03,11
+      env: TOOLSET=gcc CXXSTD=11
       addons:
         apt:
           packages:
@@ -67,7 +69,7 @@ matrix:
             - ubuntu-toolchain-r-test
     - os: linux
       compiler: g++-4.9
-      env: TOOLSET=gcc CXXSTD=03,11
+      env: TOOLSET=gcc CXXSTD=11
       addons:
         apt:
           packages:
@@ -77,7 +79,7 @@ matrix:
 
     - os: linux
       compiler: g++-5
-      env: TOOLSET=gcc CXXSTD=03,11,14,1z
+      env: TOOLSET=gcc CXXSTD=11,14,1z
       addons:
         apt:
           packages:
@@ -87,7 +89,7 @@ matrix:
 
     - os: linux
       compiler: g++-6
-      env: TOOLSET=gcc CXXSTD=03,11,14,1z
+      env: TOOLSET=gcc CXXSTD=11,14,1z
       addons:
         apt:
           packages:
@@ -97,7 +99,7 @@ matrix:
 
     - os: linux
       compiler: g++-7
-      env: TOOLSET=gcc CXXSTD=03,11,14,17 VARIANT=release
+      env: TOOLSET=gcc CXXSTD=11,14,17
       addons:
         apt:
           packages:
@@ -107,7 +109,7 @@ matrix:
 
     - os: linux
       compiler: g++-8
-      env: TOOLSET=gcc CXXSTD=03,11,14,17,2a
+      env: TOOLSET=gcc CXXSTD=11,14,17,2a
       addons:
         apt:
           packages:
@@ -115,9 +117,19 @@ matrix:
           sources:
             - ubuntu-toolchain-r-test
 
+    - os: linux
+      compiler: g++-9
+      env: TOOLSET=gcc CXXSTD=11,14,17,2a
+      addons:
+        apt:
+          packages:
+            - g++-9
+          sources:
+            - ubuntu-toolchain-r-test
+
     - os: linux
       compiler: g++-7
-      env: UBSAN=1 TOOLSET=gcc CXXSTD=03,11,14,17 UBSAN_OPTIONS=print_stacktrace=1 LINKFLAGS=-fuse-ld=gold
+      env: UBSAN=1 TOOLSET=gcc CXXSTD=11,14,17 UBSAN_OPTIONS=print_stacktrace=1 LINKFLAGS=-fuse-ld=gold
       addons:
         apt:
           packages:
@@ -127,11 +139,11 @@ matrix:
 
     - os: linux
       compiler: clang++
-      env: TOOLSET=clang CXXSTD=03,11 VARIANT=debug,release
+      env: TOOLSET=clang CXXSTD=11
 
     - os: linux
       compiler: /usr/bin/clang++
-      env: TOOLSET=clang CXXSTD=03,11
+      env: TOOLSET=clang CXXSTD=11
       addons:
         apt:
           packages:
@@ -139,7 +151,7 @@ matrix:
 
     - os: linux
       compiler: /usr/bin/clang++
-      env: TOOLSET=clang CXXSTD=03,11
+      env: TOOLSET=clang CXXSTD=11
       addons:
         apt:
           packages:
@@ -147,7 +159,7 @@ matrix:
 
     - os: linux
       compiler: clang++-3.5
-      env: TOOLSET=clang CXXSTD=03,11,14,1z
+      env: TOOLSET=clang CXXSTD=11,14,1z
       addons:
         apt:
           packages:
@@ -159,7 +171,7 @@ matrix:
 
     - os: linux
       compiler: clang++-3.6
-      env: TOOLSET=clang CXXSTD=03,11,14,1z
+      env: TOOLSET=clang CXXSTD=11,14,1z
       addons:
         apt:
           packages:
@@ -170,7 +182,7 @@ matrix:
 
     - os: linux
       compiler: clang++-3.7
-      env: TOOLSET=clang CXXSTD=03,11,14,1z
+      env: TOOLSET=clang CXXSTD=11,14,1z
       addons:
         apt:
           packages:
@@ -181,7 +193,7 @@ matrix:
 
     - os: linux
       compiler: clang++-3.8
-      env: TOOLSET=clang CXXSTD=03,11,14,1z
+      env: TOOLSET=clang CXXSTD=11,14,1z
       addons:
         apt:
           packages:
@@ -193,7 +205,7 @@ matrix:
 
     - os: linux
       compiler: clang++-3.9
-      env: TOOLSET=clang CXXSTD=03,11,14,1z
+      env: TOOLSET=clang CXXSTD=11,14,1z
       addons:
         apt:
           packages:
@@ -205,7 +217,7 @@ matrix:
 
     - os: linux
       compiler: clang++-4.0
-      env: TOOLSET=clang CXXSTD=03,11,14,1z
+      env: TOOLSET=clang CXXSTD=11,14,1z
       addons:
         apt:
           packages:
@@ -216,7 +228,7 @@ matrix:
 
     - os: linux
       compiler: clang++-5.0
-      env: TOOLSET=clang CXXSTD=03,11,14,1z VARIANT=release
+      env: TOOLSET=clang CXXSTD=11,14,1z
       addons:
         apt:
           packages:
@@ -227,7 +239,7 @@ matrix:
 
     - os: linux
       compiler: clang++-6.0
-      env: TOOLSET=clang CXXSTD=03,11,14,17,2a
+      env: TOOLSET=clang CXXSTD=11,14,17,2a
       addons:
         apt:
           packages:
@@ -238,7 +250,7 @@ matrix:
 
     - os: linux
       compiler: clang++-7
-      env: TOOLSET=clang CXXSTD=03,11,14,17,2a
+      env: TOOLSET=clang CXXSTD=11,14,17,2a
       addons:
         apt:
           packages:
@@ -248,19 +260,30 @@ matrix:
             - llvm-toolchain-trusty-7
 
     - os: linux
-      compiler: clang++-5.0
-      env: UBSAN=1 TOOLSET=clang CXXSTD=03,11,14,1z UBSAN_OPTIONS=print_stacktrace=1
+      compiler: clang++-8
+      env: TOOLSET=clang CXXSTD=11,14,17,2a
       addons:
         apt:
           packages:
-            - clang-5.0
+            - clang-8
           sources:
             - ubuntu-toolchain-r-test
-            - llvm-toolchain-trusty-5.0
+            - llvm-toolchain-trusty-8
+
+    - os: linux
+      compiler: clang++-8
+      env: UBSAN=1 TOOLSET=clang CXXSTD=11,14,17,2a UBSAN_OPTIONS=print_stacktrace=1
+      addons:
+        apt:
+          packages:
+            - clang-8
+          sources:
+            - ubuntu-toolchain-r-test
+            - llvm-toolchain-trusty-8
 
     - os: linux
       compiler: clang++-libc++
-      env: TOOLSET=clang CXXSTD=03,11,14,1z VARIANT=release
+      env: TOOLSET=clang CXXSTD=11,14,1z
       addons:
         apt:
           packages:
@@ -268,7 +291,7 @@ matrix:
 
     - os: linux
       compiler: clang++-libc++
-      env: UBSAN=1 TOOLSET=clang CXXSTD=03,11,14,1z UBSAN_OPTIONS=print_stacktrace=1
+      env: UBSAN=1 TOOLSET=clang CXXSTD=11,14,1z UBSAN_OPTIONS=print_stacktrace=1
       addons:
         apt:
           packages:
@@ -276,15 +299,13 @@ matrix:
 
     - os: osx
       compiler: clang++
-      env: TOOLSET=clang CXXSTD=03,11,14,1z
+      env: TOOLSET=clang CXXSTD=11,14,1z
 
 install:
   - BOOST_BRANCH=develop && [ "$TRAVIS_BRANCH" == "master" ] && BOOST_BRANCH=master || true
   - cd ..
   - git clone -b $BOOST_BRANCH https://github.com/boostorg/boost.git boost-root
   - cd boost-root
-  - git submodule update --init tools/build
-  - git submodule update --init libs/config
   - git submodule update --init tools/boostdep
   - cp -r $TRAVIS_BUILD_DIR/* libs/function
   - python tools/boostdep/depinst/depinst.py function
@@ -294,7 +315,7 @@ install:
 script:
   - |-
     echo "using $TOOLSET : : $TRAVIS_COMPILER ;" > ~/user-config.jam
-  - ./b2 -j3 libs/function/test toolset=$TOOLSET cxxstd=$CXXSTD ${VARIANT:+variant=$VARIANT} ${UBSAN:+cxxflags=-fsanitize=undefined cxxflags=-fno-sanitize-recover=undefined linkflags=-fsanitize=undefined debug-symbols=on} ${LINKFLAGS:+linkflags=$LINKFLAGS}
+  - ./b2 -j3 libs/function/test toolset=$TOOLSET cxxstd=$CXXSTD variant=debug,release ${UBSAN:+cxxflags=-fsanitize=undefined cxxflags=-fno-sanitize-recover=undefined linkflags=-fsanitize=undefined debug-symbols=on} ${LINKFLAGS:+linkflags=$LINKFLAGS}
 
 notifications:
   email:

CMakeLists.txt

@@ -0,0 +1,28 @@
+# Copyright 2019 Peter Dimov
+# 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
+
+# Partial (add_subdirectory only) and experimental CMake support
+# Subject to change; please do not rely on the contents of this file yet
+
+cmake_minimum_required(VERSION 3.5)
+project(BoostFunction LANGUAGES CXX)
+
+add_library(boost_function INTERFACE)
+add_library(Boost::function ALIAS boost_function)
+
+target_include_directories(boost_function INTERFACE include)
+
+target_link_libraries(boost_function
+    INTERFACE
+        Boost::assert
+        Boost::bind
+        Boost::config
+        Boost::core
+        Boost::integer
+        Boost::preprocessor
+        Boost::throw_exception
+        Boost::type_index
+        Boost::type_traits
+        Boost::typeof
+)

Jamfile

@@ -1,11 +0,0 @@
-#  Boost.Function Library Jamfile
-#
-#  Copyright (c) 2018 James E. King III
-#
-#  Use, modification, and distribution are 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)
-
-# please order by name to ease maintenance
-build-project example ;
-build-project test ;

LICENSE

@@ -1,23 +0,0 @@
-Boost Software License - Version 1.0 - August 17th, 2003
-
-Permission is hereby granted, free of charge, to any person or organization
-obtaining a copy of the software and accompanying documentation covered by
-this license (the "Software") to use, reproduce, display, distribute,
-execute, and transmit the Software, and to prepare derivative works of the
-Software, and to permit third-parties to whom the Software is furnished to
-do so, all subject to the following:
-
-The copyright notices in the Software and this entire statement, including
-the above license grant, this restriction and the following disclaimer,
-must be included in all copies of the Software, in whole or in part, and
-all derivative works of the Software, unless such copies or derivative
-works are solely in the form of machine-executable object code generated by
-a source language processor.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
-SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
-FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
-ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
-DEALINGS IN THE SOFTWARE.

README.md

@@ -1,34 +1,18 @@
-Function, part of collection of the [Boost C++ Libraries](http://github.com/boostorg), contains a family of class templates that are function object wrappers.
+# Boost.Function, a polymorphic function wrapper
 
-### License
+[Boost.Function](http://boost.org/libs/function), part of the
+[Boost C++ Libraries](http://boost.org), is the original implementation of the
+polymorphic function wrapper `boost::function`, which was eventually accepted
+into the C++11 standard as [`std::function`](https://en.cppreference.com/w/cpp/utility/functional/function).
 
-Distributed under the [Boost Software License, Version 1.0](http://www.boost.org/LICENSE_1_0.txt).
+## Currently supported compilers
 
-### Properties
+* g++ 4.4 or later
+* clang++ 3.3 or later
+* Visual Studio 2005-2017
 
-* C++03
-* Header-Only
+Tested on [Travis](https://travis-ci.org/boostorg/function/) and [Appveyor](https://ci.appveyor.com/project/pdimov/function/).
 
-### Build Status
-
-Branch          | Travis | Appveyor | Coverity Scan | codecov.io | Deps | Docs | Tests |
-:-------------: | ------ | -------- | ------------- | ---------- | ---- | ---- | ----- |
-[`master`](https://github.com/boostorg/function/tree/master) | [![Build Status](https://travis-ci.org/boostorg/function.svg?branch=master)](https://travis-ci.org/boostorg/function) | [![Build status](https://ci.appveyor.com/api/projects/status/7tgx4ac44fikr87d/branch/master?svg=true)](https://ci.appveyor.com/project/jeking3/function-d036y/branch/master) | [![Coverity Scan Build Status](https://scan.coverity.com/projects/15843/badge.svg)](https://scan.coverity.com/projects/boostorg-function) | [![codecov](https://codecov.io/gh/boostorg/function/branch/master/graph/badge.svg)](https://codecov.io/gh/boostorg/function/branch/master)| [![Deps](https://img.shields.io/badge/deps-master-brightgreen.svg)](https://pdimov.github.io/boostdep-report/master/function.html) | [![Documentation](https://img.shields.io/badge/docs-master-brightgreen.svg)](http://www.boost.org/doc/libs/master/doc/html/function.html) | [![Enter the Matrix](https://img.shields.io/badge/matrix-master-brightgreen.svg)](http://www.boost.org/development/tests/master/developer/function.html)
-[`develop`](https://github.com/boostorg/function/tree/develop) | [![Build Status](https://travis-ci.org/boostorg/function.svg?branch=develop)](https://travis-ci.org/boostorg/function) | [![Build status](https://ci.appveyor.com/api/projects/status/7tgx4ac44fikr87d/branch/develop?svg=true)](https://ci.appveyor.com/project/jeking3/function-d036y/branch/develop) | [![Coverity Scan Build Status](https://scan.coverity.com/projects/15843/badge.svg)](https://scan.coverity.com/projects/boostorg-function) | [![codecov](https://codecov.io/gh/boostorg/function/branch/develop/graph/badge.svg)](https://codecov.io/gh/boostorg/function/branch/develop) | [![Deps](https://img.shields.io/badge/deps-develop-brightgreen.svg)](https://pdimov.github.io/boostdep-report/develop/function.html) | [![Documentation](https://img.shields.io/badge/docs-develop-brightgreen.svg)](http://www.boost.org/doc/libs/develop/doc/html/function.html) | [![Enter the Matrix](https://img.shields.io/badge/matrix-develop-brightgreen.svg)](http://www.boost.org/development/tests/develop/developer/function.html)
-
-### Directories
-
-| Name        | Purpose                        |
-| ----------- | ------------------------------ |
-| `doc`       | documentation                  |
-| `example`   | examples                       |
-| `include`   | headers                        |
-| `test`      | unit tests                     |
-
-### More information
-
-* [Ask questions](http://stackoverflow.com/questions/ask?tags=c%2B%2B,boost,boost-function)
-* [Report bugs](https://github.com/boostorg/function/issues): 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 against **develop** branch. Note that by submitting patches you agree to license your modifications under the [Boost Software License, Version 1.0](http://www.boost.org/LICENSE_1_0.txt).
-* Discussions about the library are held on the [Boost developers mailing list](http://www.boost.org/community/groups.html#main). Be sure to read the [discussion policy](http://www.boost.org/community/policy.html) before posting and add the `[function]` tag at the beginning of the subject line.
+## License
 
+Distributed under the [Boost Software License, Version 1.0](http://boost.org/LICENSE_1_0.txt).

appveyor.yml

@@ -1,126 +1,61 @@
-# Copyright 2016, 2017 Peter Dimov
-# Copyright (C) 2017, 2018 James E. King III
+# Copyright 2016-2019 Peter Dimov
 # 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)
 
-#
-# Generic Appveyor build script for boostorg repositories
-# See: https://github.com/jeking3/boost-ci/
-#
-# Instructions for customizing this script for your library:
-#
-# 1. Customize the compilers and language levels you want.
-# 2. If you have move than include/, src/, test/, example/, examples/,
-#    benchmark/ or tools/ directories, set the environment variable DEPINST.
-#    For example if your build uses code in "bench/" and "fog/" directories:
-#      - DEPINST: --include bench --include fog
-# 3. Enable pull request builds in your boostorg/<library> account.
-#
-# That's it - the script will do everything else for you.
-#
-
 version: 1.0.{build}-{branch}
 
 shallow_clone: true
 
 branches:
   only:
-    - develop
     - master
-
-matrix:
-  # Adding MAYFAIL to any matrix job allows it to fail but the build stays green:
-  allow_failures:
-    - MAYFAIL: true
+    - develop
+    - /feature\/.*/
 
 environment:
-  global:
-    # see: http://www.boost.org/build/doc/html/bbv2/overview/invocation.html#bbv2.overview.invocation.properties
-    # to use the default for a given environment, comment it out; recommend you build debug and release however:
-    # on Windows it is important to exercise all the possibilities, especially shared vs static, however most
-    # libraries that care about this exercise it in their Jamfiles...
-    # B2_ADDRESS_MODEL: address-model=64,32
-    # B2_LINK: link=shared,static
-    # B2_THREADING: threading=multi,single
-    B2_VARIANT: variant=release,debug
-
   matrix:
-    - FLAVOR: Visual Studio 2017 C++2a Strict
-      APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
+    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
+      TOOLSET: msvc-9.0,msvc-10.0,msvc-11.0
+    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
+      TOOLSET: msvc-12.0,msvc-14.0
+      ADDRMD: 32,64
+    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
       TOOLSET: msvc-14.1
-      B2_ADDRESS_MODEL: address-model=64
-      CXXFLAGS: cxxflags=-permissive-
-      CXXSTD: latest # 2a
-
-    - FLAVOR: Visual Studio 2017 C++17
-      APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
-      TOOLSET: msvc-14.1
-      B2_ADDRESS_MODEL: address-model=64
-      CXXSTD: 17
-
-    - FLAVOR: Visual Studio 2017 C++14 (Default)
-      APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
-      TOOLSET: msvc-14.1
-      B2_ADDRESS_MODEL: address-model=64,32
-
-    - FLAVOR: Visual Studio 2015 C++14 (Default)
-      APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
-      TOOLSET: msvc-14.0
-      B2_ADDRESS_MODEL: address-model=64,32
-
-    - FLAVOR: Visual Studio 2010, 2012, 2013
-      APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2013
-      TOOLSET: msvc-10.0,msvc-11.0,msvc-12.0
-
-    - FLAVOR: cygwin (32-bit)
-      APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
+      CXXSTD: 14,17
+      ADDRMD: 32,64
+    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
       ADDPATH: C:\cygwin\bin;
-      B2_ADDRESS_MODEL: address-model=32
-      CXXSTD: 03,11
-      # https://github.com/boostorg/test/issues/144
-      DEFINES: define=_POSIX_C_SOURCE=200112L
-      THREADING: threadapi=pthread
       TOOLSET: gcc
-
-    - FLAVOR: cygwin (64-bit)
-      APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
+      CXXSTD: 11,14,1z
+    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
       ADDPATH: C:\cygwin64\bin;
-      B2_ADDRESS_MODEL: address-model=64
-      CXXSTD: 11,17
-      # https://github.com/boostorg/test/issues/144
-      DEFINES: define=_POSIX_C_SOURCE=200112L define=__USE_ISOC99
-      THREADING: threadapi=pthread
       TOOLSET: gcc
-
-    - FLAVOR: mingw32
-      APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
-      ARCH: i686
-      B2_ADDRESS_MODEL: address-model=32
-      CXXSTD: 03,11
-      SCRIPT: ci\appveyor\mingw.bat
-
-    - FLAVOR: mingw64
-      APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
-      ARCH: x86_64
-      B2_ADDRESS_MODEL: address-model=64
-      CXXSTD: 11,17
-      DEFINES: define=__USE_ISOC99
-      SCRIPT: ci\appveyor\mingw.bat
+      CXXSTD: 11,14,1z
+    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
+      ADDPATH: C:\mingw\bin;
+      TOOLSET: gcc
+      CXXSTD: 11,14,1z
+    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
+      ADDPATH: C:\mingw-w64\x86_64-6.3.0-posix-seh-rt_v5-rev1\mingw64\bin;
+      TOOLSET: gcc
+      CXXSTD: 11,14,1z
 
 install:
-  - set SELF=%APPVEYOR_PROJECT_NAME:-=_%
-  - git clone https://github.com/jeking3/boost-ci.git C:\boost-ci
-  - xcopy /s /e /q /i C:\boost-ci\ci .\ci
-  - ci\appveyor\install.bat
+  - 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 update --init tools/boostdep
+  - xcopy /s /e /q %APPVEYOR_BUILD_FOLDER% libs\function\
+  - python tools/boostdep/depinst/depinst.py function
+  - cmd /c bootstrap
+  - b2 -d0 headers
 
 build: off
 
 test_script:
-  - set SELF=%APPVEYOR_PROJECT_NAME:-=_%
   - PATH=%ADDPATH%%PATH%
-  # The definition of TOOLCXX omits CXXSTD= if it was not defined above
-  - IF NOT DEFINED CXXSTD (SET TOOLCXX=toolset=%TOOLSET%) ELSE (SET TOOLCXX=toolset=%TOOLSET% cxxstd=%CXXSTD%)
-  # Echo the complete build command to the build log
-  - IF NOT DEFINED SCRIPT                         (ECHO b2 libs/%SELF:\=/% %TOOLCXX% %CXXFLAGS% %DEFINES% %THREADING% %B2_ADDRESS_MODEL% %B2_LINK% %B2_THREADING% %B2_VARIANT% -j3)
-  # Now go build...
-  - IF DEFINED SCRIPT (call libs\%SELF%\%SCRIPT%) ELSE (b2 libs/%SELF:\=/% %TOOLCXX% %CXXFLAGS% %DEFINES% %THREADING% %B2_ADDRESS_MODEL% %B2_LINK% %B2_THREADING% %B2_VARIANT% -j3)
+  - if not "%CXXSTD%" == "" set CXXSTD=cxxstd=%CXXSTD%
+  - if not "%ADDRMD%" == "" set ADDRMD=address-model=%ADDRMD%
+  - b2 -j3 libs/function/test toolset=%TOOLSET% %CXXSTD% %ADDRMD% variant=debug,release

example/Jamfile

@@ -0,0 +1,14 @@
+# Boost.Function Library example Jamfile
+#
+# Copyright (c) 2008 James E. King III
+#
+# 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
+
+import ../../config/checks/config : requires ;
+import testing ;
+
+run bind1st.cpp : : : [ requires cxx98_binders ] ;
+run int_div.cpp ;
+run sum_avg.cpp ;

example/Jamfile.v2

@@ -1,21 +0,0 @@
-#  Boost.Function Library example Jamfile
-#
-#  Copyright (c) 2008 James E. King III
-#
-#  Distributed under the Boost Software License, Version 1.0. (See accompany-
-#  ing file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
-
-import ../../config/checks/config : requires ;
-import os ;
-import testing ;
-
-project
-    :   requirements
-    ;
-
-test-suite "function-examples"
-   :    [ run bind1st.cpp : : : [ requires cxx98_binders ] ]
-        [ run int_div.cpp ]
-        [ run sum_avg.cpp ]
-   ;
-

include/boost/function.hpp

@@ -10,6 +10,364 @@
 // William Kempf, Jesse Jones and Karl Nelson were all very helpful in the
 // design of this library.
 
+#include <boost/function/detail/config.hpp>
+
+#if !BOOST_FUNCTION_ENABLE_CXX03
+
+#ifndef BOOST_FUNCTION_HPP_INCLUDED
+#define BOOST_FUNCTION_HPP_INCLUDED
+
+#include <boost/ref.hpp>
+#include <boost/function_equal.hpp>
+#include <functional>
+#include <type_traits>
+
+namespace boost
+{
+
+#define BOOST_FUNCTION_TARGET_FIX(x)
+
+using std::bad_function_call;
+
+template<class S> class function: public std::function<S>
+{
+public:
+
+    function() = default;
+
+    function(function const&) = default;
+    function(function&&) = default;
+
+    using std::function<S>::function;
+
+    template<class T> function( boost::reference_wrapper<T> rt ): std::function<S>( std::ref( rt.get() ) )
+    {
+    }
+
+    function& operator=( function const& r ) = default;
+    function& operator=( function&& r ) = default;
+
+    template<class S2> function& operator=( function<S2> const& r )
+    {
+        std::function<S>::operator=( static_cast< std::function<S2> const& >( r ) );
+        return *this;
+    }
+
+    template<class S2> function& operator=( function<S2>&& r )
+    {
+        std::function<S>::operator=( static_cast< std::function<S2>&& >( r ) );
+        return *this;
+    }
+
+    template<class F, class E = typename std::enable_if< !std::is_integral<F>::value && !std::is_same<F, function>::value >::type > function& operator=( F f )
+    {
+        std::function<S>::operator=( std::move( f ) );
+        return *this;
+    }
+
+    function& operator=( std::nullptr_t f )
+    {
+        std::function<S>::operator=( f );
+        return *this;
+    }
+
+    template<class T> function& operator=( boost::reference_wrapper<T> rt )
+    {
+        std::function<S>::operator=( std::ref( rt.get() ) );
+        return *this;
+    }
+
+    bool empty() const noexcept
+    {
+        return ! *this;
+    }
+
+    void clear()
+    {
+        *this = nullptr;
+    }
+
+    template<class F, class A> void assign( F f, A )
+    {
+        this->operator=( std::move( f ) );
+    }
+
+    template<class F> F * target() noexcept
+    {
+        if( F * p = std::function<S>::template target<F>() )
+        {
+            return p;
+        }
+
+        if( std::reference_wrapper<F> * p = std::function<S>::template target< std::reference_wrapper<F> >() )
+        {
+            return std::addressof( p->get() );
+        }
+
+        return nullptr;
+    }
+
+    template<class F> F const * target() const noexcept
+    {
+        if( F const * p = std::function<S>::template target<F>() )
+        {
+            return p;
+        }
+
+        if( std::reference_wrapper<F> const * p = std::function<S>::template target< std::reference_wrapper<F> >() )
+        {
+            return std::addressof( p->get() );
+        }
+
+        return nullptr;
+    }
+
+    template<class F> bool contains( F const& f ) const noexcept
+    {
+        if( F const * fp = this->template target<F>() )
+        {
+            return function_equal( *fp, f );
+        }
+        else
+        {
+            return false;
+        }
+    }
+};
+
+template<class S, class F, class E = typename std::enable_if< !std::is_integral<F>::value && !std::is_same<F, std::nullptr_t>::value>::type> inline bool operator==( function<S> const & g, F f )
+{
+    return g.contains( f );
+}
+
+template<class S, class F, class E = typename std::enable_if< !std::is_integral<F>::value && !std::is_same<F, std::nullptr_t>::value>::type> inline bool operator!=( function<S> const & g, F f )
+{
+    return !g.contains( f );
+}
+
+template<class S, class F> inline bool operator==( function<S> const & g, boost::reference_wrapper<F> rf )
+{
+    return g.template target<F>() == std::addressof( rf.get() );
+}
+
+template<class S, class F> inline bool operator!=( function<S> const & g, boost::reference_wrapper<F> rf )
+{
+    return g.template target<F>() != std::addressof( rf.get() );
+}
+
+template<class S, class F, class E = typename std::enable_if< !std::is_integral<F>::value && !std::is_same<F, std::nullptr_t>::value>::type> inline bool operator==( F f, function<S> const & g )
+{
+    return g.contains( f );
+}
+
+template<class S, class F, class E = typename std::enable_if< !std::is_integral<F>::value && !std::is_same<F, std::nullptr_t>::value>::type> inline bool operator!=( F f, function<S> const & g )
+{
+    return !g.contains( f );
+}
+
+template<class S, class F> inline bool operator==( boost::reference_wrapper<F> rf, function<S> const & g )
+{
+    return g.template target<F>() == std::addressof( rf.get() );
+}
+
+template<class S, class F> inline bool operator!=( boost::reference_wrapper<F> rf, function<S> const & g )
+{
+    return g.template target<F>() != std::addressof( rf.get() );
+}
+
+namespace detail
+{
+
+template<class T1, class T2> struct is_similar
+{
+    BOOST_STATIC_CONSTANT( bool, value = false );
+};
+
+template<template<class...> class L, class... T1, class... T2> struct is_similar< L<T1...>, L<T2...> >
+{
+    BOOST_STATIC_CONSTANT( bool, value = true );
+};
+
+} // namespace detail
+
+#define BOOST_FUNCTION_N_COMMON \
+\
+    using base_type::base_type;\
+\
+    template<class F, class E = typename std::enable_if< !std::is_integral<F>::value && !detail::is_similar<F, this_type>::value >::type > this_type& operator=( F f )\
+    {\
+        base_type::operator=( std::move( f ) );\
+        return *this;\
+    }\
+\
+    this_type& operator=( std::nullptr_t f )\
+    {\
+        base_type::operator=( f );\
+        return *this;\
+    }\
+\
+    template<class S2> this_type& operator=( boost::function<S2> const& r )\
+    {\
+        base_type::operator=( r );\
+        return *this;\
+    }\
+\
+    template<class S2> this_type& operator=( boost::function<S2>&& r )\
+    {\
+        base_type::operator=( std::move( r ) );\
+        return *this;\
+    }
+
+template<typename R> class function0: public function<R()>
+{
+private:
+
+    typedef function0 this_type;
+    typedef function<R()> base_type;
+
+public:
+
+	BOOST_FUNCTION_N_COMMON
+};
+
+template<typename R, typename T1> class function1: public function<R(T1)>
+{
+private:
+
+    typedef function1 this_type;
+    typedef function<R(T1)> base_type;
+
+public:
+
+	BOOST_FUNCTION_N_COMMON
+};
+
+template<typename R, typename T1, typename T2> class function2: public function<R(T1, T2)>
+{
+private:
+
+    typedef function2 this_type;
+    typedef function<R(T1, T2)> base_type;
+
+public:
+
+	BOOST_FUNCTION_N_COMMON
+};
+
+template<typename R, typename T1, typename T2, typename T3> class function3: public function<R(T1, T2, T3)>
+{
+private:
+
+    typedef function3 this_type;
+    typedef function<R(T1, T2, T3)> base_type;
+
+public:
+
+	BOOST_FUNCTION_N_COMMON
+};
+
+template<typename R, typename T1, typename T2, typename T3, typename T4> class function4: public function<R(T1, T2, T3, T4)>
+{
+private:
+
+    typedef function4 this_type;
+    typedef function<R(T1, T2, T3, T4)> base_type;
+
+public:
+
+	BOOST_FUNCTION_N_COMMON
+};
+
+template<typename R, typename T1, typename T2, typename T3, typename T4, typename T5> class function5: public function<R(T1, T2, T3, T4, T5)>
+{
+private:
+
+    typedef function5 this_type;
+    typedef function<R(T1, T2, T3, T4, T5)> base_type;
+
+public:
+
+	BOOST_FUNCTION_N_COMMON
+};
+
+template<typename R, typename T1, typename T2, typename T3, typename T4, typename T5, typename T6> class function6: public function<R(T1, T2, T3, T4, T5, T6)>
+{
+private:
+
+    typedef function6 this_type;
+    typedef function<R(T1, T2, T3, T4, T5, T6)> base_type;
+
+public:
+
+	BOOST_FUNCTION_N_COMMON
+};
+
+template<typename R, typename T1, typename T2, typename T3, typename T4, typename T5, typename T6, typename T7> class function7: public function<R(T1, T2, T3, T4, T5, T6, T7)>
+{
+private:
+
+    typedef function7 this_type;
+    typedef function<R(T1, T2, T3, T4, T5, T6, T7)> base_type;
+
+public:
+
+	BOOST_FUNCTION_N_COMMON
+};
+
+template<typename R, typename T1, typename T2, typename T3, typename T4, typename T5, typename T6, typename T7, typename T8> class function8: public function<R(T1, T2, T3, T4, T5, T6, T7, T8)>
+{
+private:
+
+    typedef function8 this_type;
+    typedef function<R(T1, T2, T3, T4, T5, T6, T7, T8)> base_type;
+
+public:
+
+	BOOST_FUNCTION_N_COMMON
+};
+
+template<typename R, typename T1, typename T2, typename T3, typename T4, typename T5, typename T6, typename T7, typename T8, typename T9> class function9: public function<R(T1, T2, T3, T4, T5, T6, T7, T8, T9)>
+{
+private:
+
+    typedef function9 this_type;
+    typedef function<R(T1, T2, T3, T4, T5, T6, T7, T8, T9)> base_type;
+
+public:
+
+	BOOST_FUNCTION_N_COMMON
+};
+
+template<typename R, typename T1, typename T2, typename T3, typename T4, typename T5, typename T6, typename T7, typename T8, typename T9, typename T10> class function10: public function<R(T1, T2, T3, T4, T5, T6, T7, T8, T9, T10)>
+{
+private:
+
+    typedef function10 this_type;
+    typedef function<R(T1, T2, T3, T4, T5, T6, T7, T8, T9, T10)> base_type;
+
+public:
+
+	BOOST_FUNCTION_N_COMMON
+};
+
+template<typename R, typename... A> class function30: public function<R(A...)>
+{
+private:
+
+    typedef function30 this_type;
+    typedef function<R(A...)> base_type;
+
+public:
+
+	BOOST_FUNCTION_N_COMMON
+};
+
+} // namespace boost
+
+#endif // #ifndef BOOST_FUNCTION_HPP_INCLUDED
+
+#else
+
 #ifndef BOOST_FUNCTION_MAX_ARGS
 #  define BOOST_FUNCTION_MAX_ARGS 10
 #endif // BOOST_FUNCTION_MAX_ARGS
@@ -72,3 +430,5 @@
 #endif
 
 #endif // !defined(BOOST_FUNCTION_MAX_ARGS_DEFINED) || (BOOST_FUNCTION_MAX_ARGS_DEFINED != BOOST_FUNCTION_MAX_ARGS)
+
+#endif

include/boost/function/detail/config.hpp

@@ -0,0 +1,12 @@
+// Copyright 2019 Peter Dimov
+// 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 BOOST_FUNCTION_DETAIL_CONFIG_HPP_INCLUDED
+#define BOOST_FUNCTION_DETAIL_CONFIG_HPP_INCLUDED
+
+#if !defined(BOOST_FUNCTION_ENABLE_CXX03)
+# define BOOST_FUNCTION_ENABLE_CXX03 0
+#endif
+
+#endif // #ifndef BOOST_FUNCTION_DETAIL_CONFIG_HPP_INCLUDED

include/boost/function/detail/maybe_include.hpp

@@ -7,6 +7,10 @@
 
 // For more information, see http://www.boost.org
 
+#include <boost/function/detail/config.hpp>
+
+#if BOOST_FUNCTION_ENABLE_CXX03
+
 #if BOOST_FUNCTION_NUM_ARGS == 0
 #  undef BOOST_FUNCTION_MAX_ARGS_DEFINED
 #  define BOOST_FUNCTION_MAX_ARGS_DEFINED 0
@@ -367,3 +371,5 @@
 #else
 #  error Cannot handle Boost.Function objects that accept more than 50 arguments!
 #endif
+
+#endif

include/boost/function/function_base.hpp

@@ -396,16 +396,12 @@ namespace boost {
                functor_manager_operation_type op)
         {
           typedef typename get_function_tag<functor_type>::type tag_type;
-          switch (op) {
-          case get_functor_type_tag:
+          if (op == get_functor_type_tag) {
             out_buffer.members.type.type = &boost::typeindex::type_id<functor_type>().type_info();
             out_buffer.members.type.const_qualified = false;
             out_buffer.members.type.volatile_qualified = false;
-            return;
-
-          default:
+          } else {
             manager(in_buffer, out_buffer, op, tag_type());
-            return;
           }
         }
       };
@@ -510,16 +506,12 @@ namespace boost {
                functor_manager_operation_type op)
         {
           typedef typename get_function_tag<functor_type>::type tag_type;
-          switch (op) {
-          case get_functor_type_tag:
+          if (op == get_functor_type_tag) {
             out_buffer.members.type.type = &boost::typeindex::type_id<functor_type>().type_info();
             out_buffer.members.type.const_qualified = false;
             out_buffer.members.type.volatile_qualified = false;
-            return;
-
-          default:
+          } else {
             manager(in_buffer, out_buffer, op, tag_type());
-            return;
           }
         }
       };

include/boost/function/function_fwd.hpp

@@ -9,6 +9,7 @@
 #ifndef BOOST_FUNCTION_FWD_HPP
 #define BOOST_FUNCTION_FWD_HPP
 #include <boost/config.hpp>
+#include <boost/function/detail/config.hpp>
 
 #if defined(__sgi) && defined(_COMPILER_VERSION) && _COMPILER_VERSION <= 730 && !defined(BOOST_STRICT_CONFIG)
 // Work around a compiler bug.
@@ -24,9 +25,22 @@ namespace boost { namespace python { namespace objects {
 #  define BOOST_FUNCTION_NO_FUNCTION_TYPE_SYNTAX
 #endif
 
+#if !BOOST_FUNCTION_ENABLE_CXX03
+# include <functional>
+#endif
+
 namespace boost {
+
+#if BOOST_FUNCTION_ENABLE_CXX03
+
   class bad_function_call;
 
+#else
+
+  using std::bad_function_call;
+
+#endif
+
 #if !defined(BOOST_FUNCTION_NO_FUNCTION_TYPE_SYNTAX)
   // Preferred syntax
   template<typename Signature> class function;

meta/libraries.json

@@ -13,6 +13,6 @@
         "Programming"
     ],
     "maintainers": [
-        "Douglas Gregor <dgregor -at- cs.indiana.edu>"
+        "Peter Dimov <pdimov -at- pdimov.com>"
     ]
 }

test/Jamfile.v2

@@ -47,8 +47,8 @@ lib mixed_cxxstd : mixed_cxxstd.cpp : <link>shared:<define>MIXED_CXXSTD_DYN_LINK
 run test_mixed_cxxstd.cpp mixed_cxxstd : : : <link>shared : mixed_cxxstd_shared ;
 run test_mixed_cxxstd.cpp mixed_cxxstd : : : <link>static : mixed_cxxstd_static ;
 
-run test_mixed_cxxstd.cpp mixed_cxxstd/<cxxstd>98 : : : <link>shared : mixed_cxxstd_shared_98 ;
-run test_mixed_cxxstd.cpp mixed_cxxstd/<cxxstd>98 : : : <link>static : mixed_cxxstd_static_98 ;
+#run test_mixed_cxxstd.cpp mixed_cxxstd/<cxxstd>98 : : : <link>shared : mixed_cxxstd_shared_98 ;
+#run test_mixed_cxxstd.cpp mixed_cxxstd/<cxxstd>98 : : : <link>static : mixed_cxxstd_static_98 ;
 
 run test_mixed_cxxstd.cpp mixed_cxxstd/<cxxstd>0x : : : <link>shared : mixed_cxxstd_shared_0x ;
 run test_mixed_cxxstd.cpp mixed_cxxstd/<cxxstd>0x : : : <link>static : mixed_cxxstd_static_0x ;
@@ -57,3 +57,19 @@ local check14 = [ check-target-builds mixed_cxxstd/<cxxstd>14 : : <build>no ] ;
 
 run test_mixed_cxxstd.cpp mixed_cxxstd/<cxxstd>14 : : : <link>shared $(check14) : mixed_cxxstd_shared_14 ;
 run test_mixed_cxxstd.cpp mixed_cxxstd/<cxxstd>14 : : : <link>static $(check14) : mixed_cxxstd_static_14 ;
+
+lib return_function : return_function.cpp : <link>shared:<define>RETURN_FUNCTION_DYN_LINK=1 ;
+
+run test_return_function.cpp return_function : : : <link>shared : return_function_shared ;
+run test_return_function.cpp return_function : : : <link>static : return_function_static ;
+
+#run test_return_function.cpp return_function/<cxxstd>98 : : : <link>shared : return_function_shared_98 ;
+#run test_return_function.cpp return_function/<cxxstd>98 : : : <link>static : return_function_static_98 ;
+
+run test_return_function.cpp return_function/<cxxstd>0x : : : <link>shared : return_function_shared_0x ;
+run test_return_function.cpp return_function/<cxxstd>0x : : : <link>static : return_function_static_0x ;
+
+run test_return_function.cpp return_function/<cxxstd>14 : : : <link>shared $(check14) : return_function_shared_14 ;
+run test_return_function.cpp return_function/<cxxstd>14 : : : <link>static $(check14) : return_function_static_14 ;
+
+run quick.cpp ;

test/allocator_test.cpp

@@ -79,8 +79,10 @@ int main()
   function2<int, int, int> f;
   f.assign( plus_int<disable_small_object_optimization>(), counting_allocator<int>() );
   f.clear();
+#if BOOST_FUNCTION_ENABLE_CXX03
   BOOST_TEST_EQ( alloc_count, 1 );
   BOOST_TEST_EQ( dealloc_count, 1 );
+#endif
   alloc_count = 0;
   dealloc_count = 0;
   f.assign( plus_int<enable_small_object_optimization>(), counting_allocator<int>() );
@@ -106,8 +108,10 @@ int main()
   dealloc_count = 0;
   fv.assign( DoNothing<disable_small_object_optimization>(), counting_allocator<int>() );
   fv.clear();
+#if BOOST_FUNCTION_ENABLE_CXX03
   BOOST_TEST_EQ( alloc_count, 1 );
   BOOST_TEST_EQ( dealloc_count, 1 );
+#endif
   alloc_count = 0;
   dealloc_count = 0;
   fv.assign( DoNothing<enable_small_object_optimization>(), counting_allocator<int>() );

test/cmake_subdir_test/CMakeLists.txt

@@ -0,0 +1,49 @@
+# Copyright 2018, 2019 Peter Dimov
+# 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
+
+cmake_minimum_required(VERSION 3.5)
+
+project(cmake_subdir_test LANGUAGES CXX)
+
+add_subdirectory(../.. boostorg/function)
+
+# boost_add_subdir
+
+function(boost_add_subdir name)
+
+    add_subdirectory(../../../${name} boostorg/${name})
+
+endfunction()
+
+# primary dependencies
+
+boost_add_subdir(assert)
+boost_add_subdir(bind)
+boost_add_subdir(config)
+boost_add_subdir(core)
+boost_add_subdir(integer)
+boost_add_subdir(preprocessor)
+boost_add_subdir(throw_exception)
+boost_add_subdir(type_index)
+boost_add_subdir(type_traits)
+boost_add_subdir(typeof)
+
+# secondary dependencies
+
+boost_add_subdir(static_assert)
+boost_add_subdir(container_hash)
+boost_add_subdir(smart_ptr)
+boost_add_subdir(detail)
+boost_add_subdir(move)
+boost_add_subdir(predef)
+
+# --target check
+
+add_executable(quick ../quick.cpp)
+target_link_libraries(quick Boost::function Boost::core)
+
+enable_testing()
+add_test(quick quick)
+
+add_custom_target(check COMMAND ${CMAKE_CTEST_COMMAND} --output-on-failure -C $<CONFIG>)

test/contains_test.cpp

@@ -96,7 +96,7 @@ static void target_test()
   BOOST_CHECK(!f.target<int (*)()>());
   BOOST_CHECK(f.target<const Seventeen>());
   BOOST_CHECK(f.target<const Seventeen>() == &const_seventeen);
-  BOOST_CHECK(f.target<const volatile Seventeen>());
+  // BOOST_CHECK(f.target<const volatile Seventeen>());
   BOOST_CHECK(!f.target<Seventeen>());
   BOOST_CHECK(!f.target<volatile Seventeen>());
 }

test/function_test.cpp

@@ -9,6 +9,7 @@
 
 #include <boost/function.hpp>
 #include <boost/core/lightweight_test.hpp>
+#include <boost/config/workaround.hpp>
 #include <functional>
 #include <string>
 #include <utility>
@@ -653,14 +654,14 @@ static void test_empty_ref()
     f2();
     BOOST_ERROR("Exception didn't throw for reference to empty function.");
   }
-  catch(std::runtime_error const&) {}
+  catch(boost::bad_function_call const&) {}
 
   f1 = dummy;
 
   try {
     f2();
   }
-  catch(std::runtime_error const&) {
+  catch(boost::bad_function_call const&) {
     BOOST_ERROR("Error calling referenced function.");
   }
 }

test/quick.cpp

@@ -0,0 +1,21 @@
+// Copyright 2019 Peter Dimov
+
+// 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/function.hpp>
+#include <boost/core/lightweight_test.hpp>
+
+static int f( int x )
+{
+    return x + 1;
+}
+
+int main()
+{
+    boost::function<int(int)> fn( f );
+
+    BOOST_TEST_EQ( fn( 5 ), 6 );
+
+    return boost::report_errors();
+}

test/return_function.cpp

@@ -0,0 +1,27 @@
+
+// Copyright 2018 Peter Dimov.
+// Distributed under the Boost Software License, Version 1.0.
+
+#include <boost/function.hpp>
+#include <boost/config.hpp>
+
+#if defined(RETURN_FUNCTION_DYN_LINK)
+# define EXPORT BOOST_SYMBOL_EXPORT
+#else
+# define EXPORT
+#endif
+
+int f( int x, int y )
+{
+    return x + y;
+}
+
+EXPORT boost::function<int(int, int)> get_fn_1()
+{
+    return f;
+}
+
+EXPORT boost::function2<int, int, int> get_fn_2()
+{
+    return f;
+}

test/test_return_function.cpp

@@ -0,0 +1,21 @@
+
+// Copyright 2018 Peter Dimov.
+// Distributed under the Boost Software License, Version 1.0.
+
+#include <boost/function.hpp>
+#include <boost/core/lightweight_test.hpp>
+
+//
+
+boost::function<int(int, int)> get_fn_1();
+boost::function2<int, int, int> get_fn_2();
+
+//
+
+int main()
+{
+    BOOST_TEST_EQ( get_fn_1()( 1, 2 ), 3 );
+    BOOST_TEST_EQ( get_fn_2()( 1, 2 ), 3 );
+
+    return boost::report_errors();
+}