Merge pull request #67 from Kojoley/patch-1

Cease dependence on ContainerHash

.travis.yml

@@ -1,4 +1,5 @@
 # Copyright 2016, 2017 Peter Dimov
+# 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)
 
@@ -24,12 +25,32 @@ matrix:
     - env: BOGUS_JOB=true
 
   include:
+# gcc, Linux
     - os: linux
-      compiler: g++
-      env: TOOLSET=gcc COMPILER=g++ CXXSTD=03,11
+      dist: trusty
+      compiler: gcc-4.4
+      env: TOOLSET=gcc COMPILER=g++-4.4 CXXSTD=98,0x
+      addons:
+        apt:
+          packages:
+            - g++-4.4
+          sources:
+            - ubuntu-toolchain-r-test
 
     - os: linux
-      compiler: g++-4.7
+      dist: trusty
+      compiler: gcc-4.6
+      env: TOOLSET=gcc COMPILER=g++-4.6 CXXSTD=03,0x
+      addons:
+        apt:
+          packages:
+            - g++-4.6
+          sources:
+            - ubuntu-toolchain-r-test
+
+    - os: linux
+      dist: trusty
+      compiler: gcc-4.7
       env: TOOLSET=gcc COMPILER=g++-4.7 CXXSTD=03,11
       addons:
         apt:
@@ -39,7 +60,8 @@ matrix:
             - ubuntu-toolchain-r-test
 
     - os: linux
-      compiler: g++-4.8
+      dist: xenial
+      compiler: gcc-4.8
       env: TOOLSET=gcc COMPILER=g++-4.8 CXXSTD=03,11
       addons:
         apt:
@@ -47,8 +69,10 @@ matrix:
             - g++-4.8
           sources:
             - ubuntu-toolchain-r-test
+
     - os: linux
-      compiler: g++-4.9
+      dist: xenial
+      compiler: gcc-4.9
       env: TOOLSET=gcc COMPILER=g++-4.9 CXXSTD=03,11
       addons:
         apt:
@@ -58,7 +82,8 @@ matrix:
             - ubuntu-toolchain-r-test
 
     - os: linux
-      compiler: g++-5
+      dist: xenial
+      compiler: gcc-5
       env: TOOLSET=gcc COMPILER=g++-5 CXXSTD=03,11,14,1z
       addons:
         apt:
@@ -68,7 +93,8 @@ matrix:
             - ubuntu-toolchain-r-test
 
     - os: linux
-      compiler: g++-6
+      dist: xenial
+      compiler: gcc-6
       env: TOOLSET=gcc COMPILER=g++-6 CXXSTD=03,11,14,1z
       addons:
         apt:
@@ -78,8 +104,8 @@ matrix:
             - ubuntu-toolchain-r-test
 
     - os: linux
-      dist: trusty
-      compiler: g++-7
+      dist: xenial
+      compiler: gcc-7
       env: TOOLSET=gcc COMPILER=g++-7 CXXSTD=03,11,14,17
       addons:
         apt:
@@ -89,9 +115,9 @@ matrix:
             - ubuntu-toolchain-r-test
 
     - os: linux
-      dist: trusty
-      compiler: g++-8
-      env: TOOLSET=gcc COMPILER=g++-8 CXXSTD=03,11,14,17
+      dist: xenial
+      compiler: gcc-8
+      env: TOOLSET=gcc COMPILER=g++-8 CXXSTD=03,11,14,17,2a
       addons:
         apt:
           packages:
@@ -100,22 +126,45 @@ matrix:
             - ubuntu-toolchain-r-test
 
     - os: linux
-      compiler: clang++
-      env: TOOLSET=clang COMPILER=clang++ CXXSTD=03,11
+      dist: bionic
+      compiler: gcc-9
+      env: TOOLSET=gcc COMPILER=g++-9 CXXSTD=03,11,14,17,2a
+      addons:
+        apt:
+          packages:
+            - g++-9
+          sources:
+            - sourceline: "ppa:ubuntu-toolchain-r/test"
 
     - os: linux
-      compiler: clang++-3.5
+      dist: bionic
+      compiler: gcc-10
+      env: TOOLSET=gcc COMPILER=g++-10 CXXSTD=03,11,14,17,20
+      addons:
+        apt:
+          packages:
+            - g++-10
+          sources:
+            - sourceline: "ppa:ubuntu-toolchain-r/test"
+
+# clang, Linux
+    - os: linux
+      dist: trusty
+      compiler: clang-3.5
       env: TOOLSET=clang COMPILER=clang++-3.5 CXXSTD=03,11
       addons:
         apt:
           packages:
             - clang-3.5
+            - libstdc++-4.9-dev
           sources:
             - ubuntu-toolchain-r-test
-            - llvm-toolchain-precise-3.5
+            - sourceline: "deb http://apt.llvm.org/trusty/ llvm-toolchain-trusty-3.5 main"
+              key_url: "https://apt.llvm.org/llvm-snapshot.gpg.key"
 
     - os: linux
-      compiler: clang++-3.6
+      dist: trusty
+      compiler: clang-3.6
       env: TOOLSET=clang COMPILER=clang++-3.6 CXXSTD=03,11,14,1z
       addons:
         apt:
@@ -124,10 +173,12 @@ matrix:
             - libstdc++-5-dev
           sources:
             - ubuntu-toolchain-r-test
-            - llvm-toolchain-precise-3.6
+            - sourceline: "deb http://apt.llvm.org/trusty/ llvm-toolchain-trusty-3.6 main"
+              key_url: "https://apt.llvm.org/llvm-snapshot.gpg.key"
 
     - os: linux
-      compiler: clang++-3.7
+      dist: trusty
+      compiler: clang-3.7
       env: TOOLSET=clang COMPILER=clang++-3.7 CXXSTD=03,11,14,1z
       addons:
         apt:
@@ -136,83 +187,163 @@ matrix:
             - libstdc++-5-dev
           sources:
             - ubuntu-toolchain-r-test
-            - llvm-toolchain-precise-3.7
+            - sourceline: "deb http://apt.llvm.org/trusty/ llvm-toolchain-trusty-3.7 main"
+              key_url: "https://apt.llvm.org/llvm-snapshot.gpg.key"
 
     - os: linux
-      compiler: clang++-3.8
+      dist: xenial
+      compiler: clang-3.8
       env: TOOLSET=clang COMPILER=clang++-3.8 CXXSTD=03,11,14,1z
       addons:
         apt:
           packages:
             - clang-3.8
-            - libstdc++-5-dev
+            - libstdc++-6-dev
           sources:
             - ubuntu-toolchain-r-test
-            - llvm-toolchain-precise-3.8
+            - sourceline: "deb http://apt.llvm.org/xenial/ llvm-toolchain-xenial-3.8 main"
+              key_url: "https://apt.llvm.org/llvm-snapshot.gpg.key"
 
     - os: linux
-      compiler: clang++-3.9
+      dist: xenial
+      compiler: clang-3.9
       env: TOOLSET=clang COMPILER=clang++-3.9 CXXSTD=03,11,14,1z
       addons:
         apt:
           packages:
             - clang-3.9
-            - libstdc++-5-dev
+            - libstdc++-6-dev
           sources:
             - ubuntu-toolchain-r-test
-            - llvm-toolchain-precise-3.9
+            - sourceline: "deb http://apt.llvm.org/xenial/ llvm-toolchain-xenial-3.9 main"
+              key_url: "https://apt.llvm.org/llvm-snapshot.gpg.key"
 
     - os: linux
-      compiler: clang++-4.0
+      dist: xenial
+      compiler: clang-4
       env: TOOLSET=clang COMPILER=clang++-4.0 CXXSTD=03,11,14,1z
       addons:
         apt:
           packages:
             - clang-4.0
-            - libstdc++-5-dev
+            - libstdc++-6-dev
           sources:
             - ubuntu-toolchain-r-test
-            - llvm-toolchain-trusty-4.0
+            - sourceline: "deb http://apt.llvm.org/xenial/ llvm-toolchain-xenial-4.0 main"
+              key_url: "https://apt.llvm.org/llvm-snapshot.gpg.key"
 
     - os: linux
-      compiler: clang++-5.0
+      dist: xenial
+      compiler: clang-5
       env: TOOLSET=clang COMPILER=clang++-5.0 CXXSTD=03,11,14,1z
       addons:
         apt:
           packages:
             - clang-5.0
-            - libstdc++-5-dev
+            - libstdc++-7-dev
           sources:
             - ubuntu-toolchain-r-test
-            - llvm-toolchain-trusty-5.0
+            - sourceline: "deb http://apt.llvm.org/xenial/ llvm-toolchain-xenial-5.0 main"
+              key_url: "https://apt.llvm.org/llvm-snapshot.gpg.key"
 
     - os: linux
-      compiler: clang++-6.0
-      env: TOOLSET=clang COMPILER=clang++-6.0 CXXSTD=03,11,14,17
+      dist: xenial
+      compiler: clang-6
+      env: TOOLSET=clang COMPILER=clang++-6.0 CXXSTD=03,11,14,17,2a
       addons:
         apt:
           packages:
             - clang-6.0
-            - libstdc++-5-dev
+            - libstdc++-8-dev
           sources:
             - ubuntu-toolchain-r-test
-            - llvm-toolchain-trusty-6.0
+            - sourceline: "deb http://apt.llvm.org/xenial/ llvm-toolchain-xenial-6.0 main"
+              key_url: "https://apt.llvm.org/llvm-snapshot.gpg.key"
 
     - os: linux
-      compiler: clang++-7
-      env: TOOLSET=clang COMPILER=clang++-7 CXXSTD=03,11,14,17
+      dist: xenial
+      compiler: clang-7
+      env: TOOLSET=clang COMPILER=clang++-7 CXXSTD=03,11,14,17,2a
       addons:
         apt:
           packages:
             - clang-7
-            - libstdc++-5-dev
+            - libstdc++-8-dev
           sources:
             - ubuntu-toolchain-r-test
-            - llvm-toolchain-trusty-7
+            - sourceline: "deb http://apt.llvm.org/xenial/ llvm-toolchain-xenial-7 main"
+              key_url: "https://apt.llvm.org/llvm-snapshot.gpg.key"
+
+    - os: linux
+      dist: xenial
+      compiler: clang-8
+      env: TOOLSET=clang COMPILER=clang++-8 CXXSTD=03,11,14,17,2a
+      addons:
+        apt:
+          packages:
+            - clang-8
+            - libstdc++-8-dev
+          sources:
+            - ubuntu-toolchain-r-test
+            - sourceline: "deb http://apt.llvm.org/xenial/ llvm-toolchain-xenial-8 main"
+              key_url: "https://apt.llvm.org/llvm-snapshot.gpg.key"
+
+    - os: linux
+      dist: xenial
+      compiler: clang-9
+      env: TOOLSET=clang COMPILER=clang++-9 CXXSTD=03,11,14,17,2a
+      addons:
+        apt:
+          packages:
+            - clang-9
+            - libstdc++-9-dev
+          sources:
+            - sourceline: "ppa:ubuntu-toolchain-r/test"
+            - sourceline: "deb http://apt.llvm.org/xenial/ llvm-toolchain-xenial-9 main"
+              key_url: "https://apt.llvm.org/llvm-snapshot.gpg.key"
+
+    - os: linux
+      dist: xenial
+      compiler: clang-10
+      env: TOOLSET=clang COMPILER=clang++-10 CXXSTD=03,11,14,17,20
+      addons:
+        apt:
+          packages:
+            - clang-10
+            - libstdc++-9-dev
+          sources:
+            - sourceline: "ppa:ubuntu-toolchain-r/test"
+            - sourceline: "deb http://apt.llvm.org/xenial/ llvm-toolchain-xenial-10 main"
+              key_url: "https://apt.llvm.org/llvm-snapshot.gpg.key"
+
+    - os: linux
+      dist: xenial
+      compiler: clang-libc++
+      env: TOOLSET=clang COMPILER=clang++-10 CXXSTD=03,11,14,17,20 CXXFLAGS="-stdlib=libc++" LINKFLAGS="-stdlib=libc++"
+      addons:
+        apt:
+          packages:
+            - clang-10
+            - libc++-10-dev
+            - libc++abi-10-dev
+          sources:
+            - sourceline: "ppa:ubuntu-toolchain-r/test"
+            - sourceline: "deb http://apt.llvm.org/xenial/ llvm-toolchain-xenial-10 main"
+              key_url: "https://apt.llvm.org/llvm-snapshot.gpg.key"
+
+# clang, OS X
+# OS X builds are slow on Travis CI
+#    - os: osx
+#      env: TOOLSET=clang COMPILER=clang++ CXXSTD=03,11,14,1z
+#      osx_image: xcode9.4
+#
+#    - os: osx
+#      env: TOOLSET=clang COMPILER=clang++ CXXSTD=03,11,14,1z
+#      osx_image: xcode10.3
 
     - os: osx
-      compiler: clang++
-      env: TOOLSET=clang COMPILER=clang++ CXXSTD=03,11,14,1z
+      env: TOOLSET=clang COMPILER=clang++ CXXSTD=03,11,14,17
+      osx_image: xcode11.2
 
 install:
   - GIT_FETCH_JOBS=8
@@ -227,6 +358,7 @@ install:
   - git submodule init libs/assert
   - git submodule init libs/config
   - git submodule init libs/core
+  - git submodule init libs/io
   - git submodule init libs/preprocessor
   - git submodule init libs/static_assert
   - git submodule init libs/throw_exception
@@ -243,7 +375,7 @@ script:
   - |-
     echo "using $TOOLSET : : $COMPILER ;" > ~/user-config.jam
   - BUILD_JOBS=`(nproc || sysctl -n hw.ncpu) 2> /dev/null`
-  - ./b2 -j $BUILD_JOBS libs/utility/test toolset=$TOOLSET cxxstd=$CXXSTD
+  - ./b2 -j $BUILD_JOBS libs/utility/test toolset=$TOOLSET cxxstd=$CXXSTD ${CXXFLAGS:+cxxflags="$CXXFLAGS"} ${LINKFLAGS:+linkflags="$LINKFLAGS"}
 
 notifications:
   email:

CMakeLists.txt

@@ -3,12 +3,9 @@
 # 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
 
-# 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...3.20)
 
-cmake_minimum_required(VERSION 3.5)
-
-project(BoostUtility LANGUAGES CXX)
+project(boost_utility VERSION "${BOOST_SUPERPROJECT_VERSION}" LANGUAGES CXX)
 
 add_library(boost_utility INTERFACE)
 add_library(Boost::utility ALIAS boost_utility)
@@ -18,8 +15,8 @@ target_include_directories(boost_utility INTERFACE include)
 target_link_libraries(boost_utility
     INTERFACE
         Boost::config
-        Boost::container_hash
         Boost::core
+        Boost::io
         Boost::preprocessor
         Boost::static_assert
         Boost::throw_exception

appveyor.yml

@@ -1,4 +1,5 @@
-# Copyright 2016, 2017 Peter Dimov
+# Copyright 2016-2019 Peter Dimov
+# 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)
 
@@ -14,13 +15,44 @@ branches:
 
 environment:
   matrix:
-    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2013
-      TOOLSET: msvc-9.0,msvc-10.0,msvc-11.0,msvc-12.0
-    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
-      TOOLSET: msvc-14.0
-    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
-      TOOLSET: msvc-14.1
+    - TOOLSET: msvc-9.0,msvc-10.0,msvc-11.0
+      ADDRMD: 32
+      APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
+    - TOOLSET: msvc-12.0,msvc-14.0
+      ADDRMD: 32,64
+      APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
+    - TOOLSET: msvc-14.1
       CXXSTD: 14,17
+      ADDRMD: 32,64
+      APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
+    - TOOLSET: msvc-14.2
+      ADDRMD: 32,64
+      CXXSTD: 14,17
+      APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2019
+    - TOOLSET: clang-win
+      ADDRMD: 32,64
+      CXXSTD: 14,17
+      APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
+    - TOOLSET: gcc
+      CXXSTD: 03,11,14,1z
+      ADDPATH: C:\cygwin\bin;
+      APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
+    - TOOLSET: gcc
+      CXXSTD: 03,11,14,1z
+      ADDPATH: C:\cygwin64\bin;
+      APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
+    - TOOLSET: gcc
+      CXXSTD: 03,11,14,1z
+      ADDPATH: C:\mingw\bin;
+      APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
+    - TOOLSET: gcc
+      CXXSTD: 03,11,14,1z
+      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: 03,11,14,1z
+      ADDPATH: C:\mingw-w64\x86_64-7.3.0-posix-seh-rt_v5-rev0\mingw64\bin;
+      APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
 
 install:
   - set GIT_FETCH_JOBS=8
@@ -35,6 +67,7 @@ install:
   - git submodule init libs/assert
   - git submodule init libs/config
   - git submodule init libs/core
+  - git submodule init libs/io
   - git submodule init libs/preprocessor
   - git submodule init libs/static_assert
   - git submodule init libs/throw_exception
@@ -43,7 +76,7 @@ install:
   - git submodule init libs/integer
   - git submodule init libs/detail
   - git submodule update --jobs %GIT_FETCH_JOBS%
-  - xcopy /s /e /q %APPVEYOR_BUILD_FOLDER% libs\utility
+  - xcopy /s /e /q %APPVEYOR_BUILD_FOLDER% libs\utility\
   - cmd /c bootstrap
   - b2 -d0 headers
 
@@ -52,4 +85,5 @@ build: off
 test_script:
   - PATH=%ADDPATH%%PATH%
   - if not "%CXXSTD%" == "" set CXXSTD=cxxstd=%CXXSTD%
-  - b2 -j %NUMBER_OF_PROCESSORS% libs/utility/test toolset=%TOOLSET% %CXXSTD%
+  - if not "%ADDRMD%" == "" set ADDRMD=address-model=%ADDRMD%
+  - b2 -j %NUMBER_OF_PROCESSORS% libs/utility/test toolset=%TOOLSET% %CXXSTD% %ADDRMD% variant=debug,release

doc/declval.qbk

@@ -1,6 +1,6 @@
 [/
  / Copyright (c) 2008 Howard Hinnant
- / Copyright (c) 2009-20012 Vicente J. Botet Escriba
+ / Copyright (c) 2009-2012 Vicente J. Botet Escriba
  /
  / 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)

doc/string_ref.qbk

@@ -156,6 +156,11 @@ String-like operations:
 [section History]
 [/===============]
 
+[heading boost 1.71]
+* Glen Fernandes updated the implementation of the stream insertion operator to
+write directly to the `basic_streambuf` and refactored that functionality into
+a common utility.
+
 [heading boost 1.53]
 * Introduced
     

include/boost/detail/call_traits.hpp

@@ -100,7 +100,7 @@ struct call_traits<T&>
    typedef T& param_type;  // hh removed const
 };
 
-#if BOOST_WORKAROUND( __BORLANDC__,  < 0x5A0 )
+#if BOOST_WORKAROUND( BOOST_BORLANDC,  < 0x5A0 )
 // these are illegal specialisations; cv-qualifies applied to
 // references have no effect according to [8.3.2p1],
 // C++ Builder requires them though as it treats cv-qualified

include/boost/operators.hpp

@@ -109,6 +109,15 @@
 #   pragma warning( disable : 4284 ) // complaint about return type of
 #endif                               // operator-> not begin a UDT
 
+// Define BOOST_OPERATORS_CONSTEXPR to be like BOOST_CONSTEXPR but empty under MSVC < v19.22
+#if BOOST_WORKAROUND(BOOST_MSVC, < 1922)
+#define BOOST_OPERATORS_CONSTEXPR
+#elif defined __sun
+#define BOOST_OPERATORS_CONSTEXPR
+#else
+#define BOOST_OPERATORS_CONSTEXPR BOOST_CONSTEXPR
+#endif
+
 // In this section we supply the xxxx1 and xxxx2 forms of the operator
 // templates, which are explicitly targeted at the 1-type-argument and
 // 2-type-argument operator forms, respectively.
@@ -132,34 +141,34 @@ template <typename T> class empty_base {};
 template <class T, class U, class B = operators_detail::empty_base<T> >
 struct less_than_comparable2 : B
 {
-     friend bool operator<=(const T& x, const U& y) { return !static_cast<bool>(x > y); }
-     friend bool operator>=(const T& x, const U& y) { return !static_cast<bool>(x < y); }
-     friend bool operator>(const U& x, const T& y)  { return y < x; }
-     friend bool operator<(const U& x, const T& y)  { return y > x; }
-     friend bool operator<=(const U& x, const T& y) { return !static_cast<bool>(y < x); }
-     friend bool operator>=(const U& x, const T& y) { return !static_cast<bool>(y > x); }
+     friend BOOST_OPERATORS_CONSTEXPR bool operator<=(const T& x, const U& y) { return !static_cast<bool>(x > y); }
+     friend BOOST_OPERATORS_CONSTEXPR bool operator>=(const T& x, const U& y) { return !static_cast<bool>(x < y); }
+     friend BOOST_OPERATORS_CONSTEXPR bool operator>(const U& x, const T& y)  { return y < x; }
+     friend BOOST_OPERATORS_CONSTEXPR bool operator<(const U& x, const T& y)  { return y > x; }
+     friend BOOST_OPERATORS_CONSTEXPR bool operator<=(const U& x, const T& y) { return !static_cast<bool>(y < x); }
+     friend BOOST_OPERATORS_CONSTEXPR bool operator>=(const U& x, const T& y) { return !static_cast<bool>(y > x); }
 };
 
 template <class T, class B = operators_detail::empty_base<T> >
 struct less_than_comparable1 : B
 {
-     friend bool operator>(const T& x, const T& y)  { return y < x; }
-     friend bool operator<=(const T& x, const T& y) { return !static_cast<bool>(y < x); }
-     friend bool operator>=(const T& x, const T& y) { return !static_cast<bool>(x < y); }
+     friend BOOST_OPERATORS_CONSTEXPR bool operator>(const T& x, const T& y)  { return y < x; }
+     friend BOOST_OPERATORS_CONSTEXPR bool operator<=(const T& x, const T& y) { return !static_cast<bool>(y < x); }
+     friend BOOST_OPERATORS_CONSTEXPR bool operator>=(const T& x, const T& y) { return !static_cast<bool>(x < y); }
 };
 
 template <class T, class U, class B = operators_detail::empty_base<T> >
 struct equality_comparable2 : B
 {
-     friend bool operator==(const U& y, const T& x) { return x == y; }
-     friend bool operator!=(const U& y, const T& x) { return !static_cast<bool>(x == y); }
-     friend bool operator!=(const T& y, const U& x) { return !static_cast<bool>(y == x); }
+     friend BOOST_OPERATORS_CONSTEXPR bool operator==(const U& y, const T& x) { return x == y; }
+     friend BOOST_OPERATORS_CONSTEXPR bool operator!=(const U& y, const T& x) { return !static_cast<bool>(x == y); }
+     friend BOOST_OPERATORS_CONSTEXPR bool operator!=(const T& y, const U& x) { return !static_cast<bool>(y == x); }
 };
 
 template <class T, class B = operators_detail::empty_base<T> >
 struct equality_comparable1 : B
 {
-     friend bool operator!=(const T& x, const T& y) { return !static_cast<bool>(x == y); }
+     friend BOOST_OPERATORS_CONSTEXPR bool operator!=(const T& x, const T& y) { return !static_cast<bool>(x == y); }
 };
 
 // A macro which produces "name_2left" from "name".
@@ -362,7 +371,7 @@ BOOST_BINARY_OPERATOR( right_shiftable, >> )
 template <class T, class U, class B = operators_detail::empty_base<T> >
 struct equivalent2 : B
 {
-  friend bool operator==(const T& x, const U& y)
+  friend BOOST_OPERATORS_CONSTEXPR bool operator==(const T& x, const U& y)
   {
     return !static_cast<bool>(x < y) && !static_cast<bool>(x > y);
   }
@@ -371,7 +380,7 @@ struct equivalent2 : B
 template <class T, class B = operators_detail::empty_base<T> >
 struct equivalent1 : B
 {
-  friend bool operator==(const T&x, const T&y)
+  friend BOOST_OPERATORS_CONSTEXPR bool operator==(const T&x, const T&y)
   {
     return !static_cast<bool>(x < y) && !static_cast<bool>(y < x);
   }
@@ -380,28 +389,28 @@ struct equivalent1 : B
 template <class T, class U, class B = operators_detail::empty_base<T> >
 struct partially_ordered2 : B
 {
-  friend bool operator<=(const T& x, const U& y)
+  friend BOOST_OPERATORS_CONSTEXPR bool operator<=(const T& x, const U& y)
     { return static_cast<bool>(x < y) || static_cast<bool>(x == y); }
-  friend bool operator>=(const T& x, const U& y)
+  friend BOOST_OPERATORS_CONSTEXPR bool operator>=(const T& x, const U& y)
     { return static_cast<bool>(x > y) || static_cast<bool>(x == y); }
-  friend bool operator>(const U& x, const T& y)
+  friend BOOST_OPERATORS_CONSTEXPR bool operator>(const U& x, const T& y)
     { return y < x; }
-  friend bool operator<(const U& x, const T& y)
+  friend BOOST_OPERATORS_CONSTEXPR bool operator<(const U& x, const T& y)
     { return y > x; }
-  friend bool operator<=(const U& x, const T& y)
+  friend BOOST_OPERATORS_CONSTEXPR bool operator<=(const U& x, const T& y)
     { return static_cast<bool>(y > x) || static_cast<bool>(y == x); }
-  friend bool operator>=(const U& x, const T& y)
+  friend BOOST_OPERATORS_CONSTEXPR bool operator>=(const U& x, const T& y)
     { return static_cast<bool>(y < x) || static_cast<bool>(y == x); }
 };
 
 template <class T, class B = operators_detail::empty_base<T> >
 struct partially_ordered1 : B
 {
-  friend bool operator>(const T& x, const T& y)
+  friend BOOST_OPERATORS_CONSTEXPR bool operator>(const T& x, const T& y)
     { return y < x; }
-  friend bool operator<=(const T& x, const T& y)
+  friend BOOST_OPERATORS_CONSTEXPR bool operator<=(const T& x, const T& y)
     { return static_cast<bool>(x < y) || static_cast<bool>(x == y); }
-  friend bool operator>=(const T& x, const T& y)
+  friend BOOST_OPERATORS_CONSTEXPR bool operator>=(const T& x, const T& y)
     { return static_cast<bool>(y < x) || static_cast<bool>(x == y); }
 };
 

include/boost/utility/detail/result_of_iterate.hpp

@@ -22,7 +22,7 @@
 # define BOOST_RESULT_OF_ARGS BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(),T)
 #endif
 
-#if !BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x551))
+#if !BOOST_WORKAROUND(BOOST_BORLANDC, BOOST_TESTED_AT(0x551))
 template<typename F BOOST_PP_ENUM_TRAILING_PARAMS(BOOST_PP_ITERATION(),typename T)>
 struct tr1_result_of<F(BOOST_RESULT_OF_ARGS)>
     : conditional<
@@ -151,7 +151,7 @@ struct cpp0x_result_of_impl<F(BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(),T)),
 
 #else // defined(BOOST_RESULT_OF_USE_DECLTYPE) || defined(BOOST_RESULT_OF_USE_TR1_WITH_DECLTYPE_FALLBACK)
 
-#if !BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x551))
+#if !BOOST_WORKAROUND(BOOST_BORLANDC, BOOST_TESTED_AT(0x551))
 template<typename F BOOST_PP_ENUM_TRAILING_PARAMS(BOOST_PP_ITERATION(),typename T)>
 struct result_of<F(BOOST_RESULT_OF_ARGS)>
     : tr1_result_of<F(BOOST_RESULT_OF_ARGS)> { };
@@ -177,7 +177,7 @@ struct tr1_result_of_impl<R (&)(BOOST_PP_ENUM_PARAMS(BOOST_PP_ITERATION(),T)), F
   typedef R type;
 };
 
-#if !BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x551))
+#if !BOOST_WORKAROUND(BOOST_BORLANDC, BOOST_TESTED_AT(0x551))
 template<typename R, typename FArgs BOOST_PP_ENUM_TRAILING_PARAMS(BOOST_PP_ITERATION(),typename T)>
 struct tr1_result_of_impl<R (T0::*)
                      (BOOST_PP_ENUM_SHIFTED_PARAMS(BOOST_PP_ITERATION(),T)),

include/boost/utility/detail/result_of_variadic.hpp

@@ -0,0 +1,190 @@
+// Boost result_of library
+
+//  Copyright Douglas Gregor 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)
+
+//  Copyright Daniel Walker, Eric Niebler, Michel Morin 2008-2012.
+//  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)
+
+// For more information, see http://www.boost.org/libs/utility
+
+#ifndef BOOST_RESULT_OF_HPP
+# error Boost result_of - do not include this file!
+#endif
+
+template<typename F, typename... Args>
+struct tr1_result_of<F(Args...)>
+    : conditional<
+        is_pointer<F>::value || is_member_function_pointer<F>::value
+        , boost::detail::tr1_result_of_impl<
+            typename remove_cv<F>::type,
+            typename remove_cv<F>::type(Args...),
+            (boost::detail::result_of_has_result_type<F>::value)>
+        , boost::detail::tr1_result_of_impl<
+            F,
+            F(Args...),
+            (boost::detail::result_of_has_result_type<F>::value)> >::type { };
+
+#ifdef BOOST_RESULT_OF_USE_DECLTYPE
+template<typename F, typename... Args>
+struct result_of<F(Args...)>
+    : detail::cpp0x_result_of<F(Args...)> { };
+#endif // BOOST_RESULT_OF_USE_DECLTYPE
+
+#ifdef BOOST_RESULT_OF_USE_TR1_WITH_DECLTYPE_FALLBACK
+template<typename F, typename... Args>
+struct result_of<F(Args...)>
+    : conditional<detail::result_of_has_result_type<F>::value || detail::result_of_has_result<F>::value,
+               tr1_result_of<F(Args...)>,
+               detail::cpp0x_result_of<F(Args...)> >::type { };
+#endif // BOOST_RESULT_OF_USE_TR1_WITH_DECLTYPE_FALLBACK
+
+#if defined(BOOST_RESULT_OF_USE_DECLTYPE) || defined(BOOST_RESULT_OF_USE_TR1_WITH_DECLTYPE_FALLBACK)
+
+namespace detail {
+
+template<typename F, typename... Args>
+struct cpp0x_result_of<F(Args...)>
+    : conditional<
+          is_member_function_pointer<F>::value
+        , detail::tr1_result_of_impl<
+            typename remove_cv<F>::type,
+            typename remove_cv<F>::type(Args...), false
+          >
+        , detail::cpp0x_result_of_impl<
+              F(Args...)
+          >
+      >::type
+{};
+
+#ifdef BOOST_NO_SFINAE_EXPR
+
+template<typename F>
+struct result_of_callable_fun_2;
+
+template<typename R, typename... Args>
+struct result_of_callable_fun_2<R(Args...)> {
+    R operator()(Args...) const;
+    typedef result_of_private_type const &(*pfn_t)(...);
+    operator pfn_t() const volatile;
+};
+
+template<typename F>
+struct result_of_callable_fun
+  : result_of_callable_fun_2<F>
+{};
+
+template<typename F>
+struct result_of_callable_fun<F *>
+  : result_of_callable_fun_2<F>
+{};
+
+template<typename F>
+struct result_of_select_call_wrapper_type
+  : conditional<
+        is_class<typename remove_reference<F>::type>::value,
+        result_of_wrap_callable_class<F>,
+        type_identity<result_of_callable_fun<typename remove_cv<typename remove_reference<F>::type>::type> >
+    >::type
+{};
+
+template<typename F, typename... Args>
+struct result_of_is_callable {
+    typedef typename result_of_select_call_wrapper_type<F>::type wrapper_t;
+    static const bool value = (
+        sizeof(result_of_no_type) == sizeof(detail::result_of_is_private_type(
+            (boost::declval<wrapper_t>()(boost::declval<Args>()...), result_of_weird_type())
+        ))
+    );
+    typedef integral_constant<bool, value> type;
+};
+
+template<typename F, typename... Args>
+struct cpp0x_result_of_impl<F(Args...), true>
+    : lazy_enable_if<
+          result_of_is_callable<F, Args...>
+        , cpp0x_result_of_impl<F(Args...), false>
+      >
+{};
+
+template<typename F, typename... Args>
+struct cpp0x_result_of_impl<F(Args...), false>
+{
+  typedef decltype(
+    boost::declval<F>()(
+      boost::declval<Args>()...
+    )
+  ) type;
+};
+
+#else // BOOST_NO_SFINAE_EXPR
+
+template<typename F, typename... Args>
+struct cpp0x_result_of_impl<F(Args...),
+                            typename result_of_always_void<decltype(
+                                boost::declval<F>()(
+                                    boost::declval<Args>()...
+                                )
+                            )>::type> {
+  typedef decltype(
+    boost::declval<F>()(
+      boost::declval<Args>()...
+    )
+  ) type;
+};
+
+#endif // BOOST_NO_SFINAE_EXPR
+
+} // namespace detail
+
+#else // defined(BOOST_RESULT_OF_USE_DECLTYPE) || defined(BOOST_RESULT_OF_USE_TR1_WITH_DECLTYPE_FALLBACK)
+
+template<typename F, typename... Args>
+struct result_of<F(Args...)>
+    : tr1_result_of<F(Args...)> { };
+
+#endif // defined(BOOST_RESULT_OF_USE_DECLTYPE)
+
+namespace detail {
+
+template<typename R, typename FArgs, typename... Args>
+struct tr1_result_of_impl<R (*)(Args...), FArgs, false>
+{
+  typedef R type;
+};
+
+template<typename R, typename FArgs, typename... Args>
+struct tr1_result_of_impl<R (&)(Args...), FArgs, false>
+{
+  typedef R type;
+};
+
+template<typename R, typename FArgs, typename C, typename... Args>
+struct tr1_result_of_impl<R (C::*)(Args...), FArgs, false>
+{
+  typedef R type;
+};
+
+template<typename R, typename FArgs, typename C, typename... Args>
+struct tr1_result_of_impl<R (C::*)(Args...) const, FArgs, false>
+{
+  typedef R type;
+};
+
+template<typename R, typename FArgs, typename C, typename... Args>
+struct tr1_result_of_impl<R (C::*)(Args...) volatile, FArgs, false>
+{
+  typedef R type;
+};
+
+template<typename R, typename FArgs, typename C, typename... Args>
+struct tr1_result_of_impl<R (C::*)(Args...) const volatile, FArgs, false>
+{
+  typedef R type;
+};
+
+}

include/boost/utility/result_of.hpp

@@ -10,13 +10,6 @@
 #define BOOST_RESULT_OF_HPP
 
 #include <boost/config.hpp>
-#include <boost/preprocessor/cat.hpp>
-#include <boost/preprocessor/iteration/iterate.hpp>
-#include <boost/preprocessor/repetition/enum_params.hpp>
-#include <boost/preprocessor/repetition/enum_trailing_params.hpp>
-#include <boost/preprocessor/repetition/enum_binary_params.hpp>
-#include <boost/preprocessor/repetition/enum_shifted_params.hpp>
-#include <boost/preprocessor/facilities/intercept.hpp>
 #include <boost/detail/workaround.hpp>
 #include <boost/type_traits/is_class.hpp>
 #include <boost/type_traits/is_pointer.hpp>
@@ -29,6 +22,20 @@
 #include <boost/type_traits/integral_constant.hpp>
 #include <boost/core/enable_if.hpp>
 
+#ifdef BOOST_NO_CXX11_VARIADIC_TEMPLATES
+#  undef BOOST_RESULT_OF_NO_VARIADIC_TEMPLATES
+#  define BOOST_RESULT_OF_NO_VARIADIC_TEMPLATES
+#endif
+#ifdef BOOST_RESULT_OF_NO_VARIADIC_TEMPLATES
+#  include <boost/preprocessor/cat.hpp>
+#  include <boost/preprocessor/iteration/iterate.hpp>
+#  include <boost/preprocessor/repetition/enum_params.hpp>
+#  include <boost/preprocessor/repetition/enum_trailing_params.hpp>
+#  include <boost/preprocessor/repetition/enum_binary_params.hpp>
+#  include <boost/preprocessor/repetition/enum_shifted_params.hpp>
+#  include <boost/preprocessor/facilities/intercept.hpp>
+#endif
+
 #ifndef BOOST_RESULT_OF_NUM_ARGS
 #  define BOOST_RESULT_OF_NUM_ARGS 16
 #endif
@@ -217,8 +224,12 @@ struct tr1_result_of_impl<F, FArgs, false>
 
 } // end namespace detail
 
-#define BOOST_PP_ITERATION_PARAMS_1 (3,(0,BOOST_RESULT_OF_NUM_ARGS,<boost/utility/detail/result_of_iterate.hpp>))
-#include BOOST_PP_ITERATE()
+#ifndef BOOST_RESULT_OF_NO_VARIADIC_TEMPLATES
+#  include <boost/utility/detail/result_of_variadic.hpp>
+#else
+#  define BOOST_PP_ITERATION_PARAMS_1 (3,(0,BOOST_RESULT_OF_NUM_ARGS,<boost/utility/detail/result_of_iterate.hpp>))
+#  include BOOST_PP_ITERATE()
+#endif
 
 #if 0
 // inform dependency trackers, as they can't see through macro includes

include/boost/utility/string_ref.hpp

@@ -1,5 +1,6 @@
 /*
    Copyright (c) Marshall Clow 2012-2015.
+   Copyright (c) Glen Joseph Fernandes 2019 (glenjofe@gmail.com)
 
    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)
@@ -17,6 +18,7 @@
 
 #include <boost/config.hpp>
 #include <boost/detail/workaround.hpp>
+#include <boost/io/ostream_put.hpp>
 #include <boost/utility/string_ref_fwd.hpp>
 #include <boost/throw_exception.hpp>
 
@@ -421,52 +423,11 @@ namespace boost {
         return basic_string_ref<charT, traits>(x) >= y;
         }
 
-    namespace detail {
-
-        template<class charT, class traits>
-        inline void sr_insert_fill_chars(std::basic_ostream<charT, traits>& os, std::size_t n) {
-            enum { chunk_size = 8 };
-            charT fill_chars[chunk_size];
-            std::fill_n(fill_chars, static_cast< std::size_t >(chunk_size), os.fill());
-            for (; n >= chunk_size && os.good(); n -= chunk_size)
-                os.write(fill_chars, static_cast< std::size_t >(chunk_size));
-            if (n > 0 && os.good())
-                os.write(fill_chars, n);
-            }
-
-        template<class charT, class traits>
-        void sr_insert_aligned(std::basic_ostream<charT, traits>& os, const basic_string_ref<charT,traits>& str) {
-            const std::size_t size = str.size();
-            const std::size_t alignment_size = static_cast< std::size_t >(os.width()) - size;
-            const bool align_left = (os.flags() & std::basic_ostream<charT, traits>::adjustfield) == std::basic_ostream<charT, traits>::left;
-            if (!align_left) {
-                detail::sr_insert_fill_chars(os, alignment_size);
-                if (os.good())
-                    os.write(str.data(), size);
-                }
-            else {
-                os.write(str.data(), size);
-                if (os.good())
-                    detail::sr_insert_fill_chars(os, alignment_size);
-                }
-            }
-
-        } // namespace detail
-
     // Inserter
     template<class charT, class traits>
     inline std::basic_ostream<charT, traits>&
     operator<<(std::basic_ostream<charT, traits>& os, const basic_string_ref<charT,traits>& str) {
-        if (os.good()) {
-            const std::size_t size = str.size();
-            const std::size_t w = static_cast< std::size_t >(os.width());
-            if (w <= size)
-                os.write(str.data(), size);
-            else
-                detail::sr_insert_aligned(os, str);
-            os.width(0);
-            }
-        return os;
+        return boost::io::ostream_put(os, str.data(), str.size());
         }
 
 #if 0

include/boost/utility/string_view.hpp

@@ -1,6 +1,7 @@
 /*
    Copyright (c) Marshall Clow 2012-2015.
    Copyright (c) Beman Dawes 2015
+   Copyright (c) Glen Joseph Fernandes 2019 (glenjofe@gmail.com)
 
    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)
@@ -19,9 +20,9 @@
 
 #include <boost/config.hpp>
 #include <boost/detail/workaround.hpp>
+#include <boost/io/ostream_put.hpp>
 #include <boost/utility/string_view_fwd.hpp>
 #include <boost/throw_exception.hpp>
-#include <boost/container_hash/hash_fwd.hpp>
 
 #include <cstddef>
 #include <stdexcept>
@@ -184,7 +185,7 @@ namespace boost {
             if (pos > size())
                 BOOST_THROW_EXCEPTION(std::out_of_range("string_view::copy" ));
             size_type rlen = (std::min)(n, len_ - pos);
-    		traits_type::copy(s, data() + pos, rlen);
+            traits_type::copy(s, data() + pos, rlen);
             return rlen;
             }
 
@@ -571,53 +572,12 @@ namespace boost {
         return basic_string_view<charT, traits>(x) >= y;
         }
 
-    namespace detail {
-
-        template<class charT, class traits>
-        inline void sv_insert_fill_chars(std::basic_ostream<charT, traits>& os, std::size_t n) {
-            enum { chunk_size = 8 };
-            charT fill_chars[chunk_size];
-            std::fill_n(fill_chars, static_cast< std::size_t >(chunk_size), os.fill());
-            for (; n >= chunk_size && os.good(); n -= chunk_size)
-                os.write(fill_chars, static_cast< std::size_t >(chunk_size));
-            if (n > 0 && os.good())
-                os.write(fill_chars, n);
-            }
-
-        template<class charT, class traits>
-        void sv_insert_aligned(std::basic_ostream<charT, traits>& os, const basic_string_view<charT,traits>& str) {
-            const std::size_t size = str.size();
-            const std::size_t alignment_size = static_cast< std::size_t >(os.width()) - size;
-            const bool align_left = (os.flags() & std::basic_ostream<charT, traits>::adjustfield) == std::basic_ostream<charT, traits>::left;
-            if (!align_left) {
-                detail::sv_insert_fill_chars(os, alignment_size);
-                if (os.good())
-                    os.write(str.data(), size);
-                }
-            else {
-                os.write(str.data(), size);
-                if (os.good())
-                    detail::sv_insert_fill_chars(os, alignment_size);
-                }
-            }
-
-        } // namespace detail
-
     // Inserter
     template<class charT, class traits>
     inline std::basic_ostream<charT, traits>&
     operator<<(std::basic_ostream<charT, traits>& os,
       const basic_string_view<charT,traits>& str) {
-        if (os.good()) {
-            const std::size_t size = str.size();
-            const std::size_t w = static_cast< std::size_t >(os.width());
-            if (w <= size)
-                os.write(str.data(), size);
-            else
-                detail::sv_insert_aligned(os, str);
-            os.width(0);
-            }
-        return os;
+        return boost::io::ostream_put(os, str.data(), str.size());
         }
 
 #if 0
@@ -691,6 +651,9 @@ namespace boost {
         }
 #endif
 
+    // Forward declaration of Boost.ContainerHash function
+    template <class It> std::size_t hash_range(It, It);
+
     template <class charT, class traits>
     std::size_t hash_value(basic_string_view<charT, traits> s) {
         return boost::hash_range(s.begin(), s.end());

include/boost/utility/value_init.hpp

@@ -1,4 +1,5 @@
 // (C) Copyright 2002-2008, Fernando Luis Cacciola Carballal.
+// Copyright 2020 Peter Dimov
 //
 // Distributed under the Boost Software License, Version 1.0. (See
 // accompanying file LICENSE_1_0.txt or copy at
@@ -21,15 +22,10 @@
 // issues, by clearing the bytes of T, before constructing the T object it
 // contains. More details on these issues are at libs/utility/value_init.htm
 
-#include <boost/aligned_storage.hpp>
 #include <boost/config.hpp> // For BOOST_NO_COMPLETE_VALUE_INITIALIZATION.
-#include <boost/detail/workaround.hpp>
-#include <boost/static_assert.hpp>
-#include <boost/type_traits/cv_traits.hpp>
-#include <boost/type_traits/alignment_of.hpp>
 #include <boost/swap.hpp>
 #include <cstring>
-#include <new>
+#include <cstddef>
 
 #ifdef BOOST_MSVC
 #pragma warning(push)
@@ -60,92 +56,58 @@
 
 namespace boost {
 
+namespace detail {
+
+  struct zero_init
+  {
+    zero_init()
+    {
+    }
+
+    zero_init( void * p, std::size_t n )
+    {
+      std::memset( p, 0, n );
+    }
+  };
+
+} // namespace detail
+
 template<class T>
 class initialized
+#if BOOST_DETAIL_VALUE_INIT_WORKAROUND
+  : detail::zero_init
+#endif
 {
-  private :
-    struct wrapper
-    {
-#if !BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x592))
-      typename
-#endif 
-      remove_const<T>::type data;
+  private:
 
-      BOOST_GPU_ENABLED
-      wrapper()
-      :
-      data()
-      {
-      }
-
-      BOOST_GPU_ENABLED
-      wrapper(T const & arg)
-      :
-      data(arg)
-      {
-      }
-    };
-
-    mutable
-#if !BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x592))
-      typename
-#endif 
-      aligned_storage<sizeof(wrapper), alignment_of<wrapper>::value>::type x;
-
-    BOOST_GPU_ENABLED
-    wrapper * wrapper_address() const
-    {
-      return static_cast<wrapper *>( static_cast<void*>(&x));
-    }
+    T data_;
 
   public :
 
     BOOST_GPU_ENABLED
-    initialized()
-    {
+    initialized():
 #if BOOST_DETAIL_VALUE_INIT_WORKAROUND
-      std::memset(&x, 0, sizeof(x));
+      zero_init( &const_cast< char& >( reinterpret_cast<char const volatile&>( data_ ) ), sizeof( data_ ) ),
 #endif
-      new (wrapper_address()) wrapper();
+      data_()
+    {
     }
 
     BOOST_GPU_ENABLED
-    initialized(initialized const & arg)
+    explicit initialized(T const & arg): data_( arg )
     {
-      new (wrapper_address()) wrapper( static_cast<wrapper const &>(*(arg.wrapper_address())));
-    }
-
-    BOOST_GPU_ENABLED
-    explicit initialized(T const & arg)
-    {
-      new (wrapper_address()) wrapper(arg);
-    }
-
-    BOOST_GPU_ENABLED
-    initialized & operator=(initialized const & arg)
-    {
-      // Assignment is only allowed when T is non-const.
-      BOOST_STATIC_ASSERT( ! is_const<T>::value );
-      *wrapper_address() = static_cast<wrapper const &>(*(arg.wrapper_address()));
-      return *this;
-    }
-
-    BOOST_GPU_ENABLED
-    ~initialized()
-    {
-      wrapper_address()->wrapper::~wrapper();
     }
 
     BOOST_GPU_ENABLED
     T const & data() const
     {
-      return wrapper_address()->data;
+      return data_;
     }
 
     BOOST_GPU_ENABLED
     T& data()
     {
-      return wrapper_address()->data;
+      return data_;
     }
 
     BOOST_GPU_ENABLED
@@ -157,13 +119,13 @@ class initialized
     BOOST_GPU_ENABLED
     operator T const &() const
     {
-      return wrapper_address()->data;
+      return data_;
     }
 
     BOOST_GPU_ENABLED
     operator T&()
     {
-      return wrapper_address()->data;
+      return data_;
     }
 
 } ;

index.html

@@ -12,29 +12,31 @@
 		<p>The Boost Utility Library isn't really a single library at all. It is just a 
 			collection for components too small to be called libraries in their own right.</p>
 		<p>But that doesn't mean there isn't useful stuff here. Take a look:</p>
-		<blockquote>
-			<p>
-				<a href="../core/doc/html/core/addressof.html">addressof</a> (moved to the Boost.Core library)<br>
-				<a href="doc/html/base_from_member.html">base_from_member</a><br>
-				<a href="utility.htm#BOOST_BINARY">BOOST_BINARY</a><br>
-				<a href="call_traits.htm">call_traits</a><br>
-				<a href="../core/doc/html/core/checked_delete.html">checked_delete</a> (moved to the Boost.Core library)<br>
-				<a href="doc/html/compressed_pair.html">compressed_pair</a><br>
-				<a href="../type_traits/doc/html/boost_typetraits/reference/declval.html">declval</a> (moved to the Boost.TypeTraits library)<br>
-				<a href="../core/doc/html/core/enable_if.html">enable_if</a> (moved to the Boost.Core library)<br>
-				<a href="in_place_factories.html">in_place_factory</a><br>
-				<a href="iterator_adaptors.htm">iterator_adaptors</a><br>
-				<a href="../iterator/doc/generator_iterator.htm">generator iterator adaptors</a> (moved to the Boost.Iterator library)<br>
-				<a href="../iterator/doc/html/iterator/algorithms/next_prior.html">next/prior</a> (moved to the Boost.Iterator library)<br>
-				<a href="../core/doc/html/core/noncopyable.html">noncopyable</a> (moved to the Boost.Core library)<br>
-				<a href="operators.htm">operators</a><br>
-				<a href="utility.htm#result_of">result_of</a><br>
-				<a href="throw_exception.html">throw_exception</a><br>
-				<a href="utility.htm">utility</a><br>
-            <a href="doc/html/string_ref.html">string_ref</a><br>
-            <a href="value_init.htm">value_init</a><br>
-         </p>
-		</blockquote>
+        <ul>
+        <li><a href="doc/html/base_from_member.html">base_from_member</a></li>
+        <li><a href="utility.htm#BOOST_BINARY">BOOST_BINARY</a></li>
+        <li><a href="call_traits.htm">call_traits</a></li>
+        <li><a href="doc/html/compressed_pair.html">compressed_pair</a></li>
+        <li><a href="in_place_factories.html">in_place_factory</a></li>
+        <li><a href="iterator_adaptors.htm">iterator_adaptors</a></li>
+        <li><a href="operators.htm">operators</a></li>
+        <li><a href="utility.htm#result_of">result_of</a></li>
+        <li><a href="throw_exception.html">throw_exception</a></li>
+        <li><a href="utility.htm">utility</a></li>
+        <li><a href="doc/html/string_ref.html">string_ref</a></li>
+        <li><a href="value_init.htm">value_init</a></li>
+        </ul>
+        <p>Over time useful stuff here has moved to more appropriate Boost libraries:</p>
+        <ul>
+        <li><a href="../core/doc/html/core/addressof.html">addressof</a> (moved to Boost.Core)</li>
+        <li><a href="../core/doc/html/core/checked_delete.html">checked_delete</a> (moved to Boost.Core)</li>
+        <li><a href="../type_traits/doc/html/boost_typetraits/reference/declval.html">declval</a> (moved to Boost.TypeTraits)</li>
+        <li><a href="../core/doc/html/core/enable_if.html">enable_if</a> (moved to Boost.Core)</li>
+        <li><a href="../iterator/doc/generator_iterator.htm">generator iterator adaptors</a> (moved to Boost.Iterator)</li>
+        <li><a href="../iterator/doc/html/iterator/algorithms/next_prior.html">next/prior</a> (moved to Boost.Iterator)</li>
+        <li><a href="../core/doc/html/core/noncopyable.html">noncopyable</a> (moved to Boost.Core)</li>
+        <li><a href="../io/doc/html/io.html">ostream_string</a> (moved to Boost.IO)</li>
+        </ul>
 		<hr>
 		<p>&copy; Copyright Beman Dawes, 2001</p>
         <p>Distributed under the Boost Software License, Version 1.0. (See 

meta/libraries.json

@@ -13,7 +13,8 @@
             "Memory",
             "Miscellaneous",
             "Patterns"
-        ]
+        ],
+        "cxxstd": "03"
     },
     {
         "key": "utility/call_traits",
@@ -25,7 +26,8 @@
         "documentation": "call_traits.htm",
         "category": [
             "Generic"
-        ]
+        ],
+        "cxxstd": "03"
     },
     {
         "key": "utility/compressed_pair",
@@ -38,7 +40,8 @@
         "category": [
             "Data",
             "Patterns"
-        ]
+        ],
+        "cxxstd": "03"
     },
     {
         "key": "utility/identity_type",
@@ -53,7 +56,8 @@
         ],
         "maintainers": [
             "Lorenzo Caminiti <lorcaminiti -at- gmail.com>"
-        ]
+        ],
+        "cxxstd": "03"
     },
     {
         "key": "utility/in_place_factories",
@@ -65,7 +69,8 @@
         "documentation": "in_place_factories.html",
         "category": [
             "Generic"
-        ]
+        ],
+        "cxxstd": "03"
     },
     {
         "key": "utility/operators",
@@ -83,7 +88,8 @@
         ],
         "maintainers": [
             "Daniel Frey <d.frey -at- gmx.de>"
-        ]
+        ],
+        "cxxstd": "03"
     },
     {
         "key": "utility/result_of",
@@ -96,7 +102,22 @@
         "authors": "",
         "maintainers": [
             "Daniel Walker <daniel.j.walker -at- gmail.com>"
-        ]
+        ],
+        "cxxstd": "03"
+    },
+    {
+        "key": "utility/string_ref",
+        "name": "string_ref",
+        "description": "String view templates.",
+        "documentation": "doc/html/string_ref.html",
+        "category": [
+            "Containers"
+        ],
+        "authors": "Marshall Clow",
+        "maintainers": [
+            "Marshall Clow <marshall -at- idio.com>"
+        ],
+        "cxxstd": "03"
     },
     {
         "key": "utility/value_initialized",
@@ -108,6 +129,7 @@
         "documentation": "value_init.htm",
         "category": [
             "Miscellaneous"
-        ]
+        ],
+        "cxxstd": "03"
     }
 ]

operators.htm

@@ -119,8 +119,8 @@
     also want <code>x &gt; y, x &gt;= y,</code> and <code>x &lt;= y</code>.
     Moreover, unless your class has really surprising behavior, some of these
     related operators can be defined in terms of others (e.g. <code>x &gt;= y
-    &lt;=&gt; !(x &lt; y)</code>). Replicating this boilerplate for multiple
-    classes is both tedious and error-prone. The <cite><a href=
+    is equivalent to !(x &lt; y)</code>). Replicating this boilerplate for
+    multiple classes is both tedious and error-prone. The <cite><a href=
     "../../boost/operators.hpp">boost/operators.hpp</a></cite> templates help
     by generating operators for you at namespace scope based on other
     operators you've defined in your class.</p>
@@ -454,7 +454,7 @@ const point&lt;float&gt; pi_over_4_normalized = pi_over_4 / length(pi_over_4);
       </caption>
 
       <tr>
-        <td colspan="3">
+        <td colspan="4">
           <table align="center" border="1">
             <caption>
               <em>Key</em>
@@ -482,6 +482,8 @@ const point&lt;float&gt; pi_over_4_normalized = pi_over_4 / length(pi_over_4);
         <th>Supplied Operations</th>
 
         <th>Requirements</th>
+
+        <th>Propagates <code>constexpr</code>?</th>
       </tr>
 
       <tr>
@@ -496,6 +498,9 @@ const point&lt;float&gt; pi_over_4_normalized = pi_over_4 / length(pi_over_4);
         <td><code>t &lt; t1</code>.<br>
          Return convertible to <code>bool</code>. See the <a href=
         "#ordering">Ordering Note</a>.</td>
+
+        <td>Since <code>C++11</code><br>
+        <span style="font-size:small;">(except <a href="https://developercommunity.visualstudio.com/content/problem/414193/rejects-valid-constexpr-marked-friend-function-def.html">MSVC &lt; v19.22</a>)</span></td>
       </tr>
 
       <tr>
@@ -513,6 +518,9 @@ const point&lt;float&gt; pi_over_4_normalized = pi_over_4 / length(pi_over_4);
         <td><code>t &lt; u</code>. <code>t &gt; u</code>.<br>
          Returns convertible to <code>bool</code>. See the <a href=
         "#ordering">Ordering Note</a>.</td>
+
+        <td>Since <code>C++11</code><br>
+        <span style="font-size:small;">(except <a href="https://developercommunity.visualstudio.com/content/problem/414193/rejects-valid-constexpr-marked-friend-function-def.html">MSVC &lt; v19.22</a>)</span></td>
       </tr>
 
       <tr>
@@ -524,6 +532,9 @@ const point&lt;float&gt; pi_over_4_normalized = pi_over_4 / length(pi_over_4);
 
         <td><code>t == t1</code>.<br>
          Return convertible to <code>bool</code>.</td>
+
+        <td>Since <code>C++11</code><br>
+        <span style="font-size:small;">(except <a href="https://developercommunity.visualstudio.com/content/problem/414193/rejects-valid-constexpr-marked-friend-function-def.html">MSVC &lt; v19.22</a>)</span></td>
       </tr>
 
       <tr>
@@ -537,6 +548,9 @@ const point&lt;float&gt; pi_over_4_normalized = pi_over_4 / length(pi_over_4);
 
         <td><code>t == u</code>.<br>
          Return convertible to <code>bool</code>.</td>
+
+         <td>Since <code>C++11</code><br>
+        <span style="font-size:small;">(except <a href="https://developercommunity.visualstudio.com/content/problem/414193/rejects-valid-constexpr-marked-friend-function-def.html">MSVC &lt; v19.22</a>)</span></td>
       </tr>
 
       <tr>
@@ -548,6 +562,8 @@ const point&lt;float&gt; pi_over_4_normalized = pi_over_4 / length(pi_over_4);
         <td><code>T temp(t); temp += t1</code>.<br>
          Return convertible to <code>T</code>. See the <a href=
         "#symmetry">Symmetry Note</a>.</td>
+
+        <td>No</td>
       </tr>
 
       <tr>
@@ -560,6 +576,8 @@ const point&lt;float&gt; pi_over_4_normalized = pi_over_4 / length(pi_over_4);
         <td><code>T temp(t); temp += u</code>.<br>
          Return convertible to <code>T</code>. See the <a href=
         "#symmetry">Symmetry Note</a>.</td>
+
+        <td>No</td>
       </tr>
 
       <tr>
@@ -572,6 +590,8 @@ const point&lt;float&gt; pi_over_4_normalized = pi_over_4 / length(pi_over_4);
         <td><code>T temp(t); temp -= t1</code>.<br>
          Return convertible to <code>T</code>. See the <a href=
         "#symmetry">Symmetry Note</a>.</td>
+
+        <td>No</td>
       </tr>
 
       <tr>
@@ -584,6 +604,8 @@ const point&lt;float&gt; pi_over_4_normalized = pi_over_4 / length(pi_over_4);
         <td><code>T temp(t); temp -= u</code>.<br>
          Return convertible to <code>T</code>. See the <a href=
         "#symmetry">Symmetry Note</a>.</td>
+
+        <td>No</td>
       </tr>
 
       <tr>
@@ -594,6 +616,8 @@ const point&lt;float&gt; pi_over_4_normalized = pi_over_4 / length(pi_over_4);
 
         <td><code>T temp(u); temp -= t</code>.<br>
          Return convertible to <code>T</code>.</td>
+
+         <td>No</td>
       </tr>
 
       <tr>
@@ -606,6 +630,8 @@ const point&lt;float&gt; pi_over_4_normalized = pi_over_4 / length(pi_over_4);
         <td><code>T temp(t); temp *= t1</code>.<br>
          Return convertible to <code>T</code>. See the <a href=
         "#symmetry">Symmetry Note</a>.</td>
+
+        <td>No</td>
       </tr>
 
       <tr>
@@ -619,6 +645,8 @@ const point&lt;float&gt; pi_over_4_normalized = pi_over_4 / length(pi_over_4);
         <td><code>T temp(t); temp *= u</code>.<br>
          Return convertible to <code>T</code>. See the <a href=
         "#symmetry">Symmetry Note</a>.</td>
+
+        <td>No</td>
       </tr>
 
       <tr>
@@ -630,6 +658,8 @@ const point&lt;float&gt; pi_over_4_normalized = pi_over_4 / length(pi_over_4);
         <td><code>T temp(t); temp /= t1</code>.<br>
          Return convertible to <code>T</code>. See the <a href=
         "#symmetry">Symmetry Note</a>.</td>
+
+        <td>No</td>
       </tr>
 
       <tr>
@@ -641,6 +671,8 @@ const point&lt;float&gt; pi_over_4_normalized = pi_over_4 / length(pi_over_4);
         <td><code>T temp(t); temp /= u</code>.<br>
          Return convertible to <code>T</code>. See the <a href=
         "#symmetry">Symmetry Note</a>.</td>
+
+        <td>No</td>
       </tr>
 
       <tr>
@@ -651,6 +683,8 @@ const point&lt;float&gt; pi_over_4_normalized = pi_over_4 / length(pi_over_4);
 
         <td><code>T temp(u); temp /= t</code>.<br>
          Return convertible to <code>T</code>.</td>
+
+         <td>No</td>
       </tr>
 
       <tr>
@@ -662,6 +696,8 @@ const point&lt;float&gt; pi_over_4_normalized = pi_over_4 / length(pi_over_4);
         <td><code>T temp(t); temp %= t1</code>.<br>
          Return convertible to <code>T</code>. See the <a href=
         "#symmetry">Symmetry Note</a>.</td>
+
+        <td>No</td>
       </tr>
 
       <tr>
@@ -673,6 +709,8 @@ const point&lt;float&gt; pi_over_4_normalized = pi_over_4 / length(pi_over_4);
         <td><code>T temp(t); temp %= u</code>.<br>
          Return convertible to <code>T</code>. See the <a href=
         "#symmetry">Symmetry Note</a>.</td>
+
+        <td>No</td>
       </tr>
 
       <tr>
@@ -683,6 +721,8 @@ const point&lt;float&gt; pi_over_4_normalized = pi_over_4 / length(pi_over_4);
 
         <td><code>T temp(u); temp %= t</code>.<br>
          Return convertible to <code>T</code>.</td>
+
+         <td>No</td>
       </tr>
 
       <tr>
@@ -694,6 +734,8 @@ const point&lt;float&gt; pi_over_4_normalized = pi_over_4 / length(pi_over_4);
         <td><code>T temp(t); temp |= t1</code>.<br>
          Return convertible to <code>T</code>. See the <a href=
         "#symmetry">Symmetry Note</a>.</td>
+
+        <td>No</td>
       </tr>
 
       <tr>
@@ -706,6 +748,8 @@ const point&lt;float&gt; pi_over_4_normalized = pi_over_4 / length(pi_over_4);
         <td><code>T temp(t); temp |= u</code>.<br>
          Return convertible to <code>T</code>. See the <a href=
         "#symmetry">Symmetry Note</a>.</td>
+
+        <td>No</td>
       </tr>
 
       <tr>
@@ -717,6 +761,8 @@ const point&lt;float&gt; pi_over_4_normalized = pi_over_4 / length(pi_over_4);
         <td><code>T temp(t); temp &amp;= t1</code>.<br>
          Return convertible to <code>T</code>. See the <a href=
         "#symmetry">Symmetry Note</a>.</td>
+
+        <td>No</td>
       </tr>
 
       <tr>
@@ -729,6 +775,8 @@ const point&lt;float&gt; pi_over_4_normalized = pi_over_4 / length(pi_over_4);
         <td><code>T temp(t); temp &amp;= u</code>.<br>
          Return convertible to <code>T</code>. See the <a href=
         "#symmetry">Symmetry Note</a>.</td>
+
+        <td>No</td>
       </tr>
 
       <tr>
@@ -740,6 +788,8 @@ const point&lt;float&gt; pi_over_4_normalized = pi_over_4 / length(pi_over_4);
         <td><code>T temp(t); temp ^= t1</code>.<br>
          Return convertible to <code>T</code>. See the <a href=
         "#symmetry">Symmetry Note</a>.</td>
+
+        <td>No</td>
       </tr>
 
       <tr>
@@ -752,6 +802,8 @@ const point&lt;float&gt; pi_over_4_normalized = pi_over_4 / length(pi_over_4);
         <td><code>T temp(t); temp ^= u</code>.<br>
          Return convertible to <code>T</code>. See the <a href=
         "#symmetry">Symmetry Note</a>.</td>
+
+        <td>No</td>
       </tr>
 
       <tr>
@@ -762,6 +814,8 @@ const point&lt;float&gt; pi_over_4_normalized = pi_over_4 / length(pi_over_4);
 
         <td><code>T temp(t); ++t</code><br>
          Return convertible to <code>T</code>.</td>
+
+         <td>No</td>
       </tr>
 
       <tr>
@@ -772,6 +826,8 @@ const point&lt;float&gt; pi_over_4_normalized = pi_over_4 / length(pi_over_4);
 
         <td><code>T temp(t); --t;</code><br>
          Return convertible to <code>T</code>.</td>
+
+         <td>No</td>
       </tr>
 
       <tr>
@@ -784,6 +840,8 @@ const point&lt;float&gt; pi_over_4_normalized = pi_over_4 / length(pi_over_4);
         <td><code>T temp(t); temp &lt;&lt;= t1</code>.<br>
          Return convertible to <code>T</code>. See the <a href=
         "#symmetry">Symmetry Note</a>.</td>
+
+        <td>No</td>
       </tr>
 
       <tr>
@@ -796,6 +854,8 @@ const point&lt;float&gt; pi_over_4_normalized = pi_over_4 / length(pi_over_4);
         <td><code>T temp(t); temp &lt;&lt;= u</code>.<br>
          Return convertible to <code>T</code>. See the <a href=
         "#symmetry">Symmetry Note</a>.</td>
+
+        <td>No</td>
       </tr>
 
       <tr>
@@ -808,6 +868,8 @@ const point&lt;float&gt; pi_over_4_normalized = pi_over_4 / length(pi_over_4);
         <td><code>T temp(t); temp &gt;&gt;= t1</code>.<br>
          Return convertible to <code>T</code>. See the <a href=
         "#symmetry">Symmetry Note</a>.</td>
+
+        <td>No</td>
       </tr>
 
       <tr>
@@ -820,6 +882,8 @@ const point&lt;float&gt; pi_over_4_normalized = pi_over_4 / length(pi_over_4);
         <td><code>T temp(t); temp &gt;&gt;= u</code>.<br>
          Return convertible to <code>T</code>. See the <a href=
         "#symmetry">Symmetry Note</a>.</td>
+
+        <td>No</td>
       </tr>
 
       <tr>
@@ -831,6 +895,9 @@ const point&lt;float&gt; pi_over_4_normalized = pi_over_4 / length(pi_over_4);
         <td><code>t &lt; t1</code>.<br>
          Return convertible to <code>bool</code>. See the <a href=
         "#ordering">Ordering Note</a>.</td>
+
+        <td>Since <code>C++11</code><br>
+        <span style="font-size:small;">(except <a href="https://developercommunity.visualstudio.com/content/problem/414193/rejects-valid-constexpr-marked-friend-function-def.html">MSVC &lt; v19.22</a>)</span></td>
       </tr>
 
       <tr>
@@ -842,6 +909,9 @@ const point&lt;float&gt; pi_over_4_normalized = pi_over_4 / length(pi_over_4);
         <td><code>t &lt; u</code>. <code>t &gt; u</code>.<br>
          Returns convertible to <code>bool</code>. See the <a href=
         "#ordering">Ordering Note</a>.</td>
+
+        <td>Since <code>C++11</code><br>
+        <span style="font-size:small;">(except <a href="https://developercommunity.visualstudio.com/content/problem/414193/rejects-valid-constexpr-marked-friend-function-def.html">MSVC &lt; v19.22</a>)</span></td>
       </tr>
 
       <tr>
@@ -856,6 +926,9 @@ const point&lt;float&gt; pi_over_4_normalized = pi_over_4 / length(pi_over_4);
         <td><code>t &lt; t1</code>. <code>t == t1</code>.<br>
          Returns convertible to <code>bool</code>. See the <a href=
         "#ordering">Ordering Note</a>.</td>
+
+        <td>Since <code>C++11</code><br>
+        <span style="font-size:small;">(except <a href="https://developercommunity.visualstudio.com/content/problem/414193/rejects-valid-constexpr-marked-friend-function-def.html">MSVC &lt; v19.22</a>)</span></td>
       </tr>
 
       <tr>
@@ -874,6 +947,9 @@ const point&lt;float&gt; pi_over_4_normalized = pi_over_4 / length(pi_over_4);
         u</code>.<br>
          Returns convertible to <code>bool</code>. See the <a href=
         "#ordering">Ordering Note</a>.</td>
+
+        <td>Since <code>C++11</code><br>
+        <span style="font-size:small;">(except <a href="https://developercommunity.visualstudio.com/content/problem/414193/rejects-valid-constexpr-marked-friend-function-def.html">MSVC &lt; v19.22</a>)</span></td>
       </tr>
     </table>
 

test/Jamfile.v2

@@ -21,6 +21,7 @@ run compressed_pair_final_test.cpp ;
 run iterators_test.cpp ;
 
 run operators_test.cpp ;
+compile operators_constexpr_test.cpp ;
 
 compile result_of_test.cpp ;
 
@@ -35,6 +36,8 @@ run string_view_test2.cpp ;
 run string_view_test_io.cpp ;
 
 run value_init_test.cpp ;
+run value_init_test2.cpp ;
+run value_init_test3.cpp ;
 run value_init_workaround_test.cpp ;
 run initialized_test.cpp ;
 compile-fail value_init_test_fail1.cpp ;

test/call_traits_test.cpp

@@ -376,7 +376,7 @@ void call_traits_test<T, true>::assert_construct(typename boost::call_traits<T>:
    reference r = t;
    const_reference cr = t;
    reference r2 = r;
-   #ifndef __BORLANDC__
+   #ifndef BOOST_BORLANDC
    // C++ Builder buglet:
    const_reference cr2 = r;
    #endif
@@ -393,7 +393,7 @@ void call_traits_test<T, true>::assert_construct(typename boost::call_traits<T>:
    unused_variable(v3);
    unused_variable(v4);
    unused_variable(v5);
-#ifndef __BORLANDC__
+#ifndef BOOST_BORLANDC
    unused_variable(r2);
    unused_variable(cr2);
 #endif

test/operators_constexpr_test.cpp

@@ -0,0 +1,59 @@
+/*
+Copyright 2020 Glen Joseph Fernandes
+(glenjofe@gmail.com)
+
+Distributed under the Boost Software License, Version 1.0.
+(http://www.boost.org/LICENSE_1_0.txt)
+*/
+
+#include <boost/config.hpp>
+#if !defined(BOOST_NO_CXX11_CONSTEXPR) && \
+    (!defined(BOOST_MSVC) || (BOOST_MSVC >= 1922))
+#include <boost/operators.hpp>
+#include <boost/static_assert.hpp>
+
+namespace {
+
+class Value
+    : boost::operators<Value> {
+public:
+    BOOST_OPERATORS_CONSTEXPR explicit Value(int v)
+        : v_(v) { }
+
+    BOOST_OPERATORS_CONSTEXPR bool
+    operator<(const Value& x) const {
+        return v_ < x.v_;
+    }
+
+    BOOST_OPERATORS_CONSTEXPR bool
+    operator==(const Value& x) const {
+        return v_ == x.v_;
+    }
+
+private:
+    int v_;
+};
+
+} // namespace
+
+BOOST_STATIC_ASSERT(!static_cast<bool>(Value(1) == Value(2)));
+BOOST_STATIC_ASSERT(Value(1) != Value(2));
+BOOST_STATIC_ASSERT(Value(1) < Value(2));
+BOOST_STATIC_ASSERT(Value(1) <= Value(2));
+BOOST_STATIC_ASSERT(!static_cast<bool>(Value(1) > Value(2)));
+BOOST_STATIC_ASSERT(!static_cast<bool>(Value(1) >= Value(2)));
+
+BOOST_STATIC_ASSERT(!static_cast<bool>(Value(2) == Value(1)));
+BOOST_STATIC_ASSERT(Value(2) != Value(1));
+BOOST_STATIC_ASSERT(!static_cast<bool>(Value(2) < Value(1)));
+BOOST_STATIC_ASSERT(!static_cast<bool>(Value(2) <= Value(1)));
+BOOST_STATIC_ASSERT(Value(2) >  Value(1));
+BOOST_STATIC_ASSERT(Value(2) >= Value(1));
+
+BOOST_STATIC_ASSERT(Value(1) == Value(1));
+BOOST_STATIC_ASSERT(!static_cast<bool>(Value(1) != Value(1)));
+BOOST_STATIC_ASSERT(!static_cast<bool>(Value(1) < Value(1)));
+BOOST_STATIC_ASSERT(Value(1) <= Value(1));
+BOOST_STATIC_ASSERT(!static_cast<bool>(Value(1) > Value(1)));
+BOOST_STATIC_ASSERT(Value(1) >= Value(1));
+#endif

test/operators_test.cpp

@@ -50,9 +50,9 @@ namespace
         void operator!() const;
 
     public:
-        convertible_to_bool( const bool value ) : _value( value ) {}
+         convertible_to_bool( const bool value ) : _value( value ) {}
 
-        operator unspecified_bool_type() const
+         operator unspecified_bool_type() const
           { return _value ? &convertible_to_bool::_value : 0; }
     };
 
@@ -64,12 +64,12 @@ namespace
         , boost::shiftable<Wrapped1<T> >
     {
     public:
-        explicit Wrapped1( T v = T() ) : _value(v) {}
-        T value() const { return _value; }
+         explicit Wrapped1( T v = T() ) : _value(v) {}
+         T value() const { return _value; }
 
-        convertible_to_bool operator<(const Wrapped1& x) const
+         convertible_to_bool operator<(const Wrapped1& x) const
           { return _value < x._value; }
-        convertible_to_bool operator==(const Wrapped1& x) const
+         convertible_to_bool operator==(const Wrapped1& x) const
           { return _value == x._value; }
         
         Wrapped1& operator+=(const Wrapped1& x)
@@ -92,8 +92,8 @@ namespace
           { _value <<= x._value; return *this; }
         Wrapped1& operator>>=(const Wrapped1& x)
           { _value >>= x._value; return *this; }
-        Wrapped1& operator++()               { ++_value; return *this; }
-        Wrapped1& operator--()               { --_value; return *this; }
+        Wrapped1& operator++() { ++_value; return *this; }
+        Wrapped1& operator--() { --_value; return *this; }
         
     private:
         T _value;

test/string_view_constexpr_test1.cpp

@@ -12,6 +12,7 @@
 #include <cstddef>    // for NULL, std::size_t, std::ptrdiff_t
 #include <cstring>    // for std::strchr and std::strcmp
 #include <cstdlib>    // for std::malloc and std::free
+#include <cstdio>     // for EOF
 
 #include <boost/config.hpp>
 #include <boost/utility/string_view.hpp>
@@ -19,11 +20,11 @@
 #if __cplusplus >= 201402L
 struct constexpr_char_traits
 {
-    typedef char		    char_type;
-    typedef int   			int_type;
-    typedef std::streamoff	off_type;
-    typedef std::streampos	pos_type;
-    typedef std::mbstate_t	state_type;
+    typedef char            char_type;
+    typedef int             int_type;
+    typedef std::streamoff  off_type;
+    typedef std::streampos  pos_type;
+    typedef std::mbstate_t  state_type;
 
     static void assign(char_type& c1, const char_type& c2) noexcept { c1 = c2; }
     static constexpr bool eq(char_type c1, char_type c2) noexcept   { return c1 == c2; }
@@ -43,11 +44,11 @@ struct constexpr_char_traits
     static constexpr int_type  eof() noexcept                                 { return EOF; }
 };
 
-//	yields:
-//		0 if for each i in [0,n), X::eq(s1[i],s2[i]) is true; 
-//		else, a negative value if, for some j in [0,n), X::lt(s1[j],s2[j]) is true and
-//			for each i in [0,j) X::eq(s2[i],s2[i]) is true;
-//		else a positive value.
+//  yields:
+//      0 if for each i in [0,n), X::eq(s1[i],s2[i]) is true;
+//      else, a negative value if, for some j in [0,n), X::lt(s1[j],s2[j]) is true and
+//          for each i in [0,j) X::eq(s2[i],s2[i]) is true;
+//      else a positive value.
 constexpr int constexpr_char_traits::compare(const char_type* s1, const char_type* s2, size_t n) noexcept
 {
     for (; n != 0; --n, ++s1, ++s2)
@@ -77,38 +78,38 @@ int main()
     constexpr string_view sv2{"abc", 3}; // ptr, len
     constexpr string_view sv3{"def"}; 	 // ptr
 
-	constexpr const char *s1 = "";
-	constexpr const char *s2 = "abc";
-	
-	static_assert( (sv1 == sv1), "" );
-	
-	static_assert(!(sv1 == sv2), "" );    
-	static_assert( (sv1 != sv2), "" );    
-	static_assert( (sv1 <  sv2), "" );    
-	static_assert( (sv1 <= sv2), "" );    
-	static_assert(!(sv1 >  sv2), "" );    
-	static_assert(!(sv1 >= sv2), "" );    
+    constexpr const char *s1 = "";
+    constexpr const char *s2 = "abc";
 
-	static_assert(!(s1 == sv2), "" );    
-	static_assert( (s1 != sv2), "" );    
-	static_assert( (s1 <  sv2), "" );    
-	static_assert( (s1 <= sv2), "" );    
-	static_assert(!(s1 >  sv2), "" );    
-	static_assert(!(s1 >= sv2), "" );    
+    static_assert( (sv1 == sv1), "" );
 
-	static_assert(!(sv1 == s2), "" );    
-	static_assert( (sv1 != s2), "" );    
-	static_assert( (sv1 <  s2), "" );    
-	static_assert( (sv1 <= s2), "" );    
-	static_assert(!(sv1 >  s2), "" );    
-	static_assert(!(sv1 >= s2), "" );    
+    static_assert(!(sv1 == sv2), "" );
+    static_assert( (sv1 != sv2), "" );
+    static_assert( (sv1 <  sv2), "" );
+    static_assert( (sv1 <= sv2), "" );
+    static_assert(!(sv1 >  sv2), "" );
+    static_assert(!(sv1 >= sv2), "" );
 
-	static_assert( sv1.compare(sv2)  < 0, "" );    
-	static_assert( sv1.compare(sv1) == 0, "" );    
-	static_assert( sv3.compare(sv1)  > 0, "" );    
+    static_assert(!(s1 == sv2), "" );
+    static_assert( (s1 != sv2), "" );
+    static_assert( (s1 <  sv2), "" );
+    static_assert( (s1 <= sv2), "" );
+    static_assert(!(s1 >  sv2), "" );
+    static_assert(!(s1 >= sv2), "" );
 
-	static_assert( sv1.compare(s2)  < 0, "" );    
-	static_assert( sv1.compare(s1) == 0, "" );    
-	static_assert( sv3.compare(s1)  > 0, "" );    
+    static_assert(!(sv1 == s2), "" );
+    static_assert( (sv1 != s2), "" );
+    static_assert( (sv1 <  s2), "" );
+    static_assert( (sv1 <= s2), "" );
+    static_assert(!(sv1 >  s2), "" );
+    static_assert(!(sv1 >= s2), "" );
+
+    static_assert( sv1.compare(sv2)  < 0, "" );
+    static_assert( sv1.compare(sv1) == 0, "" );
+    static_assert( sv3.compare(sv1)  > 0, "" );
+
+    static_assert( sv1.compare(s2)  < 0, "" );
+    static_assert( sv1.compare(s1) == 0, "" );
+    static_assert( sv3.compare(s1)  > 0, "" );
 }
 #endif

test/value_init_test.cpp

@@ -17,11 +17,12 @@
 
 #include "boost/utility/value_init.hpp"
 
-#ifdef __BORLANDC__
+#ifdef BOOST_BORLANDC
 #pragma hdrstop
 #endif
 
 #include <boost/core/lightweight_test.hpp>
+#include <boost/config/workaround.hpp>
 
 //
 // Sample POD type
@@ -217,8 +218,8 @@ void check_initialized_value ( T const& y )
   BOOST_TEST ( y == initializedValue ) ;
 }
 
-#ifdef  __BORLANDC__
-#if __BORLANDC__ == 0x582
+#ifdef  BOOST_BORLANDC
+#if BOOST_BORLANDC == 0x582
 void check_initialized_value( NonPOD const& )
 {
   // The initialized_value check is skipped for Borland 5.82

test/value_init_test2.cpp

@@ -0,0 +1,169 @@
+// Copyright 2010, Niels Dekker.
+//
+// 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)
+//
+// Test program for the boost::value_initialized<T> workaround.
+//
+// 17 June 2010 (Created) Niels Dekker
+
+#include <boost/utility/value_init.hpp>
+#include <boost/core/lightweight_test.hpp>
+#include <boost/config/workaround.hpp>
+#include <iostream>
+
+namespace
+{
+  struct empty_struct
+  {
+  };
+
+  // A POD aggregate struct derived from an empty struct.
+  // Similar to struct Foo1 from Microsoft Visual C++ bug report 484295,
+  // "VC++ does not value-initialize members of derived classes without 
+  // user-declared constructor", reported in 2009 by Sylvester Hesp:
+  // https://connect.microsoft.com/VisualStudio/feedback/details/484295
+  struct derived_struct: empty_struct
+  {
+    int data;
+  };
+
+  bool is_value_initialized(const derived_struct& arg)
+  {
+    return arg.data == 0;
+  }
+
+
+  class virtual_destructor_holder
+  {
+  public:
+    int i;
+    virtual ~virtual_destructor_holder()
+    {
+    }
+  };
+
+  bool is_value_initialized(const virtual_destructor_holder& arg)
+  {
+    return arg.i == 0;
+  }
+
+  // Equivalent to the Stats class from GCC Bug 33916,
+  // "Default constructor fails to initialize array members", reported in 2007 by
+  // Michael Elizabeth Chastain: http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33916
+  // and fixed for GCC 4.2.4.
+  class private_int_array_pair
+  {
+    friend bool is_value_initialized(const private_int_array_pair& arg);
+  private:
+    int first[12];
+    int second[12];
+  };
+
+  bool is_value_initialized(const private_int_array_pair& arg)
+  {
+    for ( unsigned i = 0; i < 12; ++i)
+    {
+      if ( (arg.first[i] != 0) || (arg.second[i] != 0) )
+      {
+        return false;
+      }
+    }
+    return true;
+  }
+
+  struct int_pair_struct
+  {
+    int first;
+    int second;
+  };
+
+  typedef int int_pair_struct::*ptr_to_member_type;
+
+  struct ptr_to_member_struct
+  {
+    ptr_to_member_type data;
+  };
+
+  bool is_value_initialized(const ptr_to_member_struct& arg)
+  {
+    return arg.data == 0;
+  }
+
+  template <typename T>
+  bool is_value_initialized(const T(& arg)[2])
+  {
+    return
+      is_value_initialized(arg[0]) &&
+      is_value_initialized(arg[1]);
+  }
+
+  template <typename T>
+  bool is_value_initialized(const boost::value_initialized<T>& arg)
+  {
+    return is_value_initialized(arg.data());
+  }
+
+  // Returns zero when the specified object is value-initializated, and one otherwise.
+  // Prints a message to standard output if the value-initialization has failed.
+  template <class T>
+  unsigned failed_to_value_initialized(const T& object, const char *const object_name)
+  {
+    if ( is_value_initialized(object) )
+    {
+      return 0u;
+    }
+    else
+    {
+      std::cout << "Note: Failed to value-initialize " << object_name << '.' << std::endl;
+      return 1u;
+    }
+  }
+
+// A macro that passed both the name and the value of the specified object to
+// the function above here.
+#define FAILED_TO_VALUE_INITIALIZE(value) failed_to_value_initialized(value, #value)
+
+  // Equivalent to the dirty_stack() function from GCC Bug 33916,
+  // "Default constructor fails to initialize array members", reported in 2007 by
+  // Michael Elizabeth Chastain: http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33916
+  void dirty_stack()
+  {
+    unsigned char array_on_stack[4096];
+    for (unsigned i = 0; i < sizeof(array_on_stack); ++i)
+    {
+      array_on_stack[i] = 0x11;
+    }
+  }
+
+}
+
+
+int main()
+{
+#ifdef BOOST_DETAIL_VALUE_INIT_WORKAROUND_SUGGESTED
+
+  std::cout << "BOOST_DETAIL_VALUE_INIT_WORKAROUND_SUGGESTED is defined.\n\n";
+
+#endif
+
+  dirty_stack();
+
+  BOOST_TEST( is_value_initialized( boost::value_initialized<derived_struct>() ) );
+  BOOST_TEST( is_value_initialized( boost::value_initialized<virtual_destructor_holder[2]>() ) );
+  BOOST_TEST( is_value_initialized( boost::value_initialized<private_int_array_pair>() ) );
+
+#if !BOOST_WORKAROUND( BOOST_MSVC, BOOST_TESTED_AT(1925) )
+
+  // Null pointers to data members are represented as -1 in MSVC, but
+  // value initialization sets them to all zero. The workaround employed
+  // by value_initialized<> is to memset the storage to all zero, which
+  // doesn't help.
+
+  BOOST_TEST( is_value_initialized( boost::value_initialized<ptr_to_member_struct>() ) );
+
+#endif
+
+  return boost::report_errors();
+}

test/value_init_test3.cpp

@@ -0,0 +1,40 @@
+// Copyright 2020 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt)
+
+#include <boost/utility/value_init.hpp>
+#include <boost/core/lightweight_test.hpp>
+#include <boost/config.hpp>
+#include <boost/config/pragma_message.hpp>
+
+#if __cplusplus >= 201103L || ( defined(BOOST_MSVC) && BOOST_MSVC >= 1900 )
+
+struct X
+{
+    int a;
+    char b;
+};
+
+struct Y: boost::value_initialized<X>
+{
+    char c = 42;
+};
+
+int main()
+{
+    Y y;
+
+    BOOST_TEST_EQ( y.data().a, 0 );
+    BOOST_TEST_EQ( y.data().b, 0 );
+    BOOST_TEST_EQ( y.c, 42 );
+
+    return boost::report_errors();
+}
+
+#else
+
+BOOST_PRAGMA_MESSAGE( "Skipping test because compiler doesn't support in-class member initializers" )
+
+int main() {}
+
+#endif

test/value_init_test_fail1.cpp

@@ -13,7 +13,7 @@
 
 #include "boost/utility/value_init.hpp"
 
-#ifdef __BORLANDC__
+#ifdef BOOST_BORLANDC
 #pragma hdrstop
 #endif
 

test/value_init_test_fail2.cpp

@@ -13,7 +13,7 @@
 
 #include "boost/utility/value_init.hpp"
 
-#ifdef __BORLANDC__
+#ifdef BOOST_BORLANDC
 #pragma hdrstop
 #endif
 

test/value_init_test_fail3.cpp

@@ -13,7 +13,7 @@
 
 #include "boost/utility/value_init.hpp"
 
-#ifdef __BORLANDC__
+#ifdef BOOST_BORLANDC
 #pragma hdrstop
 #endif