Construct the unqualified value_type with placement new

Fix convert-assign tests for C++98
Fix tests on C++03
2025-07-14 12:56:35 +02:00 · 2022-02-18 22:03:05 +02:00 · 2021-12-22 10:36:40 +01:00 · 2021-12-09 22:22:05 +01:00 · 2021-11-20 02:00:30 +01:00 · 2021-08-03 16:07:09 +02:00
52 changed files with 282 additions and 113 deletions
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@ -21,7 +21,8 @@ jobs:
            buildtype: "boost"
            packages: ""
            packages_to_remove: ""
-            os: "ubuntu-16.04"
+            os: "ubuntu-20.04"
+            container: "ubuntu:16.04"
            cxx: "g++"
            sources: ""
            llvm_os: ""
@ -33,7 +34,8 @@ jobs:
            buildtype: "boost"
            packages: "g++-4.7"
            packages_to_remove: ""
-            os: "ubuntu-16.04"
+            os: "ubuntu-20.04"
+            container: "ubuntu:16.04"
            cxx: "g++-4.7"
            sources: ""
            llvm_os: ""
@ -45,7 +47,8 @@ jobs:
            buildtype: "boost"
            packages: "g++-4.8"
            packages_to_remove: ""
-            os: "ubuntu-16.04"
+            os: "ubuntu-20.04"
+            container: "ubuntu:16.04"
            cxx: "g++-4.8"
            sources: ""
            llvm_os: ""
@ -57,7 +60,8 @@ jobs:
            buildtype: "boost"
            packages: "g++-4.9"
            packages_to_remove: ""
-            os: "ubuntu-16.04"
+            os: "ubuntu-20.04"
+            container: "ubuntu:16.04"
            cxx: "g++-4.9"
            sources: ""
            llvm_os: ""
@ -69,7 +73,8 @@ jobs:
            buildtype: "boost"
            packages: "g++-5"
            packages_to_remove: ""
-            os: "ubuntu-16.04"
+            os: "ubuntu-20.04"
+            container: "ubuntu:16.04"
            cxx: "g++-5"
            sources: ""
            llvm_os: ""
@ -81,7 +86,8 @@ jobs:
            buildtype: "boost"
            packages: "g++-6"
            packages_to_remove: ""
-            os: "ubuntu-16.04"
+            os: "ubuntu-20.04"
+            container: "ubuntu:16.04"
            cxx: "g++-6"
            sources: ""
            llvm_os: ""
@ -93,7 +99,8 @@ jobs:
            buildtype: "boost"
            packages: "g++-7"
            packages_to_remove: ""
-            os: "ubuntu-16.04"
+            os: "ubuntu-20.04"
+            container: "ubuntu:16.04"
            cxx: "g++-7"
            sources: ""
            llvm_os: ""
@ -105,7 +112,7 @@ jobs:
            buildtype: "boost"
            packages: ""
            packages_to_remove: ""
-            os: "ubuntu-16.04"
+            os: "ubuntu-18.04"
            cxx: "clang++"
            sources: ""
            llvm_os: ""
@ -117,7 +124,8 @@ jobs:
            buildtype: "boost"
            packages: "clang-3.5 libstdc++-4.9-dev"
            packages_to_remove: ""
-            os: "ubuntu-16.04"
+            os: "ubuntu-20.04"
+            container: "ubuntu:16.04"
            cxx: "clang++-3.5"
            sources: ""
            llvm_os: "precise"
@ -129,7 +137,8 @@ jobs:
            buildtype: "boost"
            packages: "clang-3.6"
            packages_to_remove: ""
-            os: "ubuntu-16.04"
+            os: "ubuntu-20.04"
+            container: "ubuntu:16.04"
            cxx: "clang++-3.6"
            sources: ""
            llvm_os: "precise"
@ -141,7 +150,8 @@ jobs:
            buildtype: "boost"
            packages: "clang-3.7"
            packages_to_remove: ""
-            os: "ubuntu-16.04"
+            os: "ubuntu-20.04"
+            container: "ubuntu:16.04"
            cxx: "clang++-3.7"
            sources: ""
            llvm_os: "precise"
@ -153,7 +163,8 @@ jobs:
            buildtype: "boost"
            packages: "clang-3.8 libstdc++-4.9-dev"
            packages_to_remove: ""
-            os: "ubuntu-16.04"
+            os: "ubuntu-20.04"
+            container: "ubuntu:16.04"
            cxx: "clang++-3.8"
            sources: ""
            llvm_os: "precise"
@ -165,7 +176,8 @@ jobs:
            buildtype: "boost"
            packages: "clang-3.9 libstdc++-4.9-dev"
            packages_to_remove: ""
-            os: "ubuntu-16.04"
+            os: "ubuntu-20.04"
+            container: "ubuntu:16.04"
            cxx: "clang++-3.9"
            sources: ""
            llvm_os: "precise"
@ -177,7 +189,7 @@ jobs:
            buildtype: "boost"
            packages: "clang-4.0"
            packages_to_remove: ""
-            os: "ubuntu-16.04"
+            os: "ubuntu-20.04"
            container: "ubuntu:14.04"
            cxx: "clang++-4.0"
            sources: ""
@ -190,7 +202,7 @@ jobs:
            buildtype: "boost"
            packages: "clang-5.0"
            packages_to_remove: ""
-            os: "ubuntu-16.04"
+            os: "ubuntu-20.04"
            container: "ubuntu:14.04"
            cxx: "clang++-5.0"
            sources: ""
@ -210,10 +222,12 @@ jobs:
      - name: If running in container, upgrade packages
        if: matrix.container != ''
        run: |
-            sudo apt-get -o Acquire::Retries=3 update && DEBIAN_FRONTEND=noninteractive apt-get -y install tzdata && apt-get -o Acquire::Retries=3 install -y sudo software-properties-common wget curl apt-transport-https make apt-file sudo unzip libssl-dev build-essential autotools-dev autoconf automake g++ libc++-helpers python python-pip ruby cpio gcc-multilib g++-multilib pkgconf python3 python3-pip ccache libpython-dev
+            apt-get -o Acquire::Retries=3 update && DEBIAN_FRONTEND=noninteractive apt-get -y install tzdata && apt-get -o Acquire::Retries=3 install -y sudo software-properties-common wget curl apt-transport-https make apt-file sudo unzip libssl-dev build-essential autotools-dev autoconf automake g++ libc++-helpers python ruby cpio gcc-multilib g++-multilib pkgconf python3 ccache libpython-dev
            sudo apt-add-repository ppa:git-core/ppa
            sudo apt-get -o Acquire::Retries=3 update && apt-get -o Acquire::Retries=3 -y install git
-            sudo python -m pip install --upgrade pip==20.3.4
+            python_version=$(python3 -c 'import sys; print("{0.major}.{0.minor}".format(sys.version_info))')
+            sudo wget https://bootstrap.pypa.io/pip/$python_version/get-pip.py
+            sudo python3 get-pip.py
            sudo /usr/local/bin/pip install cmake

      - uses: actions/checkout@v2
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@ -1,12 +1,9 @@
 # Copyright 2019 Mike Dev
 # 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
-#
-# NOTE: CMake support for Boost.Optional is currently experimental at best
-#       and the interface is likely to change in the future

-cmake_minimum_required( VERSION 3.5 )
-project( BoostOptional )
+cmake_minimum_required( VERSION 3.5...3.20 )
+project( boost_optional VERSION "${BOOST_SUPERPROJECT_VERSION}" LANGUAGES CXX )

 add_library( boost_optional INTERFACE )
 add_library( Boost::optional ALIAS boost_optional )
--- a/doc/00_optional.qbk
+++ b/doc/00_optional.qbk
@ -2,7 +2,7 @@
    [quickbook 1.4]
    [authors [Cacciola Carballal, Fernando Luis]]
    [copyright 2003-2007 Fernando Luis Cacciola Carballal]
-    [copyright 2014-2020 Andrzej Krzemie&#324;ski]
+    [copyright 2014-2021 Andrzej Krzemie&#324;ski]
    [category miscellaneous]
    [id optional]
    [dirname optional]
--- a/doc/91_relnotes.qbk
+++ b/doc/91_relnotes.qbk
@ -1,7 +1,7 @@
 [/
    Boost.Optional

-    Copyright (c) 2015 - 2018 Andrzej Krzemienski
+    Copyright (c) 2015 - 2021 Andrzej Krzemienski

    Distributed under the Boost Software License, Version 1.0.
    (See accompanying file LICENSE_1_0.txt or copy at
@ -11,6 +11,14 @@

 [section:relnotes Release Notes]

+[heading Boost Release 1.79]
+
+* Fixed [@https://github.com/boostorg/optional/issues/98 issue #98].
+
+[heading Boost Release 1.77]
+
+* Fixed [@https://github.com/boostorg/optional/issues/92 issue #92].
+
 [heading Boost Release 1.76]

 * Fixed MSVC warning C4702.
--- a/doc/html/boost_optional/acknowledgements.html
+++ b/doc/html/boost_optional/acknowledgements.html
@ -116,7 +116,7 @@
 </div>
 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
 <td align="left"></td>
-<td align="right"><div class="copyright-footer">Copyright © 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright © 2014-2020 Andrzej Krzemieński<p>
+<td align="right"><div class="copyright-footer">Copyright © 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright © 2014-2021 Andrzej Krzemieński<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
      </p>
--- a/doc/html/boost_optional/dependencies_and_portability.html
+++ b/doc/html/boost_optional/dependencies_and_portability.html
@ -77,7 +77,7 @@
 </div>
 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
 <td align="left"></td>
-<td align="right"><div class="copyright-footer">Copyright © 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright © 2014-2020 Andrzej Krzemieński<p>
+<td align="right"><div class="copyright-footer">Copyright © 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright © 2014-2021 Andrzej Krzemieński<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
      </p>
--- a/doc/html/boost_optional/dependencies_and_portability/emplace_operations_in_older_compilers.html
+++ b/doc/html/boost_optional/dependencies_and_portability/emplace_operations_in_older_compilers.html
@ -76,7 +76,7 @@
 </div>
 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
 <td align="left"></td>
-<td align="right"><div class="copyright-footer">Copyright © 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright © 2014-2020 Andrzej Krzemieński<p>
+<td align="right"><div class="copyright-footer">Copyright © 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright © 2014-2021 Andrzej Krzemieński<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
      </p>
--- a/doc/html/boost_optional/dependencies_and_portability/optional_reference_binding.html
+++ b/doc/html/boost_optional/dependencies_and_portability/optional_reference_binding.html
@ -93,7 +93,7 @@
 </div>
 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
 <td align="left"></td>
-<td align="right"><div class="copyright-footer">Copyright © 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright © 2014-2020 Andrzej Krzemieński<p>
+<td align="right"><div class="copyright-footer">Copyright © 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright © 2014-2021 Andrzej Krzemieński<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
      </p>
--- a/doc/html/boost_optional/quick_start.html
+++ b/doc/html/boost_optional/quick_start.html
@ -155,7 +155,7 @@
 </div>
 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
 <td align="left"></td>
-<td align="right"><div class="copyright-footer">Copyright © 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright © 2014-2020 Andrzej Krzemieński<p>
+<td align="right"><div class="copyright-footer">Copyright © 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright © 2014-2021 Andrzej Krzemieński<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
      </p>
--- a/doc/html/boost_optional/quick_start/bypassing_unnecessary_default_construction.html
+++ b/doc/html/boost_optional/quick_start/bypassing_unnecessary_default_construction.html
@ -61,7 +61,7 @@
 </div>
 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
 <td align="left"></td>
-<td align="right"><div class="copyright-footer">Copyright © 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright © 2014-2020 Andrzej Krzemieński<p>
+<td align="right"><div class="copyright-footer">Copyright © 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright © 2014-2021 Andrzej Krzemieński<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
      </p>
--- a/doc/html/boost_optional/quick_start/optional_automatic_variables.html
+++ b/doc/html/boost_optional/quick_start/optional_automatic_variables.html
@ -61,7 +61,7 @@
 </div>
 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
 <td align="left"></td>
-<td align="right"><div class="copyright-footer">Copyright © 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright © 2014-2020 Andrzej Krzemieński<p>
+<td align="right"><div class="copyright-footer">Copyright © 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright © 2014-2021 Andrzej Krzemieński<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
      </p>
--- a/doc/html/boost_optional/quick_start/optional_data_members.html
+++ b/doc/html/boost_optional/quick_start/optional_data_members.html
@ -80,7 +80,7 @@
 </div>
 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
 <td align="left"></td>
-<td align="right"><div class="copyright-footer">Copyright © 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright © 2014-2020 Andrzej Krzemieński<p>
+<td align="right"><div class="copyright-footer">Copyright © 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright © 2014-2021 Andrzej Krzemieński<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
      </p>
--- a/doc/html/boost_optional/quick_start/storage_in_containers.html
+++ b/doc/html/boost_optional/quick_start/storage_in_containers.html
@ -50,7 +50,7 @@
 </div>
 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
 <td align="left"></td>
-<td align="right"><div class="copyright-footer">Copyright © 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright © 2014-2020 Andrzej Krzemieński<p>
+<td align="right"><div class="copyright-footer">Copyright © 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright © 2014-2021 Andrzej Krzemieński<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
      </p>
--- a/doc/html/boost_optional/reference/header__boost_optional_bad_optional_access_hpp_.html
+++ b/doc/html/boost_optional/reference/header__boost_optional_bad_optional_access_hpp_.html
@ -49,7 +49,7 @@
 </div>
 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
 <td align="left"></td>
-<td align="right"><div class="copyright-footer">Copyright © 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright © 2014-2020 Andrzej Krzemieński<p>
+<td align="right"><div class="copyright-footer">Copyright © 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright © 2014-2021 Andrzej Krzemieński<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
      </p>
--- a/doc/html/boost_optional/reference/header__boost_optional_bad_optional_access_hpp_/detailed_semantics.html
+++ b/doc/html/boost_optional/reference/header__boost_optional_bad_optional_access_hpp_/detailed_semantics.html
@ -46,7 +46,7 @@
 </div>
 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
 <td align="left"></td>
-<td align="right"><div class="copyright-footer">Copyright © 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright © 2014-2020 Andrzej Krzemieński<p>
+<td align="right"><div class="copyright-footer">Copyright © 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright © 2014-2021 Andrzej Krzemieński<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
      </p>
--- a/doc/html/boost_optional/reference/header__boost_optional_hpp_.html
+++ b/doc/html/boost_optional/reference/header__boost_optional_hpp_.html
@ -33,7 +33,7 @@
 </div>
 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
 <td align="left"></td>
-<td align="right"><div class="copyright-footer">Copyright © 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright © 2014-2020 Andrzej Krzemieński<p>
+<td align="right"><div class="copyright-footer">Copyright © 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright © 2014-2021 Andrzej Krzemieński<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
      </p>
--- a/doc/html/boost_optional/reference/header__boost_optional_optional_fwd_hpp_.html
+++ b/doc/html/boost_optional/reference/header__boost_optional_optional_fwd_hpp_.html
@ -52,7 +52,7 @@
 </div>
 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
 <td align="left"></td>
-<td align="right"><div class="copyright-footer">Copyright © 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright © 2014-2020 Andrzej Krzemieński<p>
+<td align="right"><div class="copyright-footer">Copyright © 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright © 2014-2021 Andrzej Krzemieński<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
      </p>
--- a/doc/html/boost_optional/reference/header__boost_optional_optional_hpp_/detailed_semantics___free_functions.html
+++ b/doc/html/boost_optional/reference/header__boost_optional_optional_hpp_/detailed_semantics___free_functions.html
@ -507,7 +507,7 @@
 </div>
 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
 <td align="left"></td>
-<td align="right"><div class="copyright-footer">Copyright © 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright © 2014-2020 Andrzej Krzemieński<p>
+<td align="right"><div class="copyright-footer">Copyright © 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright © 2014-2021 Andrzej Krzemieński<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
      </p>
--- a/doc/html/boost_optional/reference/header__boost_optional_optional_hpp_/detailed_semantics___optional_references.html
+++ b/doc/html/boost_optional/reference/header__boost_optional_optional_hpp_/detailed_semantics___optional_references.html
@ -538,7 +538,7 @@
 </div>
 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
 <td align="left"></td>
-<td align="right"><div class="copyright-footer">Copyright © 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright © 2014-2020 Andrzej Krzemieński<p>
+<td align="right"><div class="copyright-footer">Copyright © 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright © 2014-2021 Andrzej Krzemieński<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
      </p>
--- a/doc/html/boost_optional/reference/header__boost_optional_optional_hpp_/detailed_semantics___optional_values.html
+++ b/doc/html/boost_optional/reference/header__boost_optional_optional_hpp_/detailed_semantics___optional_values.html
@ -1774,7 +1774,7 @@
 </div>
 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
 <td align="left"></td>
-<td align="right"><div class="copyright-footer">Copyright © 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright © 2014-2020 Andrzej Krzemieński<p>
+<td align="right"><div class="copyright-footer">Copyright © 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright © 2014-2021 Andrzej Krzemieński<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
      </p>
--- a/doc/html/boost_optional/reference/header__boost_optional_optional_hpp_/header_optional_in_place_init.html
+++ b/doc/html/boost_optional/reference/header__boost_optional_optional_hpp_/header_optional_in_place_init.html
@ -47,7 +47,7 @@
 </div>
 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
 <td align="left"></td>
-<td align="right"><div class="copyright-footer">Copyright © 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright © 2014-2020 Andrzej Krzemieński<p>
+<td align="right"><div class="copyright-footer">Copyright © 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright © 2014-2021 Andrzej Krzemieński<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
      </p>
--- a/doc/html/boost_optional/reference/header__boost_optional_optional_hpp_/header_optional_optional_refs.html
+++ b/doc/html/boost_optional/reference/header__boost_optional_optional_hpp_/header_optional_optional_refs.html
@ -104,7 +104,7 @@
 </div>
 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
 <td align="left"></td>
-<td align="right"><div class="copyright-footer">Copyright © 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright © 2014-2020 Andrzej Krzemieński<p>
+<td align="right"><div class="copyright-footer">Copyright © 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright © 2014-2021 Andrzej Krzemieński<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
      </p>
--- a/doc/html/boost_optional/reference/header__boost_optional_optional_hpp_/header_optional_optional_values.html
+++ b/doc/html/boost_optional/reference/header__boost_optional_optional_hpp_/header_optional_optional_values.html
@ -139,7 +139,7 @@
 </div>
 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
 <td align="left"></td>
-<td align="right"><div class="copyright-footer">Copyright © 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright © 2014-2020 Andrzej Krzemieński<p>
+<td align="right"><div class="copyright-footer">Copyright © 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright © 2014-2021 Andrzej Krzemieński<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
      </p>
--- a/doc/html/boost_optional/reference/io_header.html
+++ b/doc/html/boost_optional/reference/io_header.html
@ -58,7 +58,7 @@
 </div>
 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
 <td align="left"></td>
-<td align="right"><div class="copyright-footer">Copyright © 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright © 2014-2020 Andrzej Krzemieński<p>
+<td align="right"><div class="copyright-footer">Copyright © 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright © 2014-2021 Andrzej Krzemieński<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
      </p>
--- a/doc/html/boost_optional/reference/io_header/io_semantics.html
+++ b/doc/html/boost_optional/reference/io_header/io_semantics.html
@ -98,7 +98,7 @@
 </div>
 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
 <td align="left"></td>
-<td align="right"><div class="copyright-footer">Copyright © 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright © 2014-2020 Andrzej Krzemieński<p>
+<td align="right"><div class="copyright-footer">Copyright © 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright © 2014-2021 Andrzej Krzemieński<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
      </p>
--- a/doc/html/boost_optional/relnotes.html
+++ b/doc/html/boost_optional/relnotes.html
@ -28,6 +28,24 @@
 </h2></div></div></div>
 <h4>
 <a name="boost_optional.relnotes.h0"></a>
+      <span class="phrase"><a name="boost_optional.relnotes.boost_release_1_79"></a></span><a class="link" href="relnotes.html#boost_optional.relnotes.boost_release_1_79">Boost
+      Release 1.79</a>
+    </h4>
+<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">
+          Fixed <a href="https://github.com/boostorg/optional/issues/98" target="_top">issue
+          #98</a>.
+        </li></ul></div>
+<h4>
+<a name="boost_optional.relnotes.h1"></a>
+      <span class="phrase"><a name="boost_optional.relnotes.boost_release_1_77"></a></span><a class="link" href="relnotes.html#boost_optional.relnotes.boost_release_1_77">Boost
+      Release 1.77</a>
+    </h4>
+<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">
+          Fixed <a href="https://github.com/boostorg/optional/issues/92" target="_top">issue
+          #92</a>.
+        </li></ul></div>
+<h4>
+<a name="boost_optional.relnotes.h2"></a>
      <span class="phrase"><a name="boost_optional.relnotes.boost_release_1_76"></a></span><a class="link" href="relnotes.html#boost_optional.relnotes.boost_release_1_76">Boost
      Release 1.76</a>
    </h4>
@ -35,7 +53,7 @@
          Fixed MSVC warning C4702.
        </li></ul></div>
 <h4>
-<a name="boost_optional.relnotes.h1"></a>
+<a name="boost_optional.relnotes.h3"></a>
      <span class="phrase"><a name="boost_optional.relnotes.boost_release_1_75"></a></span><a class="link" href="relnotes.html#boost_optional.relnotes.boost_release_1_75">Boost
      Release 1.75</a>
    </h4>
@ -49,7 +67,7 @@
        </li>
 </ul></div>
 <h4>
-<a name="boost_optional.relnotes.h2"></a>
+<a name="boost_optional.relnotes.h4"></a>
      <span class="phrase"><a name="boost_optional.relnotes.boost_release_1_73"></a></span><a class="link" href="relnotes.html#boost_optional.relnotes.boost_release_1_73">Boost
      Release 1.73</a>
    </h4>
@ -72,7 +90,7 @@
        </li>
 </ul></div>
 <h4>
-<a name="boost_optional.relnotes.h3"></a>
+<a name="boost_optional.relnotes.h5"></a>
      <span class="phrase"><a name="boost_optional.relnotes.boost_release_1_69"></a></span><a class="link" href="relnotes.html#boost_optional.relnotes.boost_release_1_69">Boost
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    </h4>
@ -90,7 +108,7 @@
        </li>
 </ul></div>
 <h4>
-<a name="boost_optional.relnotes.h4"></a>
+<a name="boost_optional.relnotes.h6"></a>
      <span class="phrase"><a name="boost_optional.relnotes.boost_release_1_68"></a></span><a class="link" href="relnotes.html#boost_optional.relnotes.boost_release_1_68">Boost
      Release 1.68</a>
    </h4>
@ -107,7 +125,7 @@
        </li>
 </ul></div>
 <h4>
-<a name="boost_optional.relnotes.h5"></a>
+<a name="boost_optional.relnotes.h7"></a>
      <span class="phrase"><a name="boost_optional.relnotes.boost_release_1_67"></a></span><a class="link" href="relnotes.html#boost_optional.relnotes.boost_release_1_67">Boost
      Release 1.67</a>
    </h4>
@ -121,7 +139,7 @@
        </li>
 </ul></div>
 <h4>
-<a name="boost_optional.relnotes.h6"></a>
+<a name="boost_optional.relnotes.h8"></a>
      <span class="phrase"><a name="boost_optional.relnotes.boost_release_1_66"></a></span><a class="link" href="relnotes.html#boost_optional.relnotes.boost_release_1_66">Boost
      Release 1.66</a>
    </h4>
@ -139,7 +157,7 @@
        </li>
 </ul></div>
 <h4>
-<a name="boost_optional.relnotes.h7"></a>
+<a name="boost_optional.relnotes.h9"></a>
      <span class="phrase"><a name="boost_optional.relnotes.boost_release_1_63"></a></span><a class="link" href="relnotes.html#boost_optional.relnotes.boost_release_1_63">Boost
      Release 1.63</a>
    </h4>
@ -163,7 +181,7 @@
        </li>
 </ul></div>
 <h4>
-<a name="boost_optional.relnotes.h8"></a>
+<a name="boost_optional.relnotes.h10"></a>
      <span class="phrase"><a name="boost_optional.relnotes.boost_release_1_62"></a></span><a class="link" href="relnotes.html#boost_optional.relnotes.boost_release_1_62">Boost
      Release 1.62</a>
    </h4>
@ -171,7 +189,7 @@
          Fixed <a href="https://svn.boost.org/trac/boost/ticket/12179" target="_top">Trac #12179</a>.
        </li></ul></div>
 <h4>
-<a name="boost_optional.relnotes.h9"></a>
+<a name="boost_optional.relnotes.h11"></a>
      <span class="phrase"><a name="boost_optional.relnotes.boost_release_1_61"></a></span><a class="link" href="relnotes.html#boost_optional.relnotes.boost_release_1_61">Boost
      Release 1.61</a>
    </h4>
@ -214,7 +232,7 @@
        </li>
 </ul></div>
 <h4>
-<a name="boost_optional.relnotes.h10"></a>
+<a name="boost_optional.relnotes.h12"></a>
      <span class="phrase"><a name="boost_optional.relnotes.boost_release_1_60"></a></span><a class="link" href="relnotes.html#boost_optional.relnotes.boost_release_1_60">Boost
      Release 1.60</a>
    </h4>
@ -225,7 +243,7 @@
          #11203</a>.
        </li></ul></div>
 <h4>
-<a name="boost_optional.relnotes.h11"></a>
+<a name="boost_optional.relnotes.h13"></a>
      <span class="phrase"><a name="boost_optional.relnotes.boost_release_1_59"></a></span><a class="link" href="relnotes.html#boost_optional.relnotes.boost_release_1_59">Boost
      Release 1.59</a>
    </h4>
@ -239,7 +257,7 @@
        </li>
 </ul></div>
 <h4>
-<a name="boost_optional.relnotes.h12"></a>
+<a name="boost_optional.relnotes.h14"></a>
      <span class="phrase"><a name="boost_optional.relnotes.boost_release_1_58"></a></span><a class="link" href="relnotes.html#boost_optional.relnotes.boost_release_1_58">Boost
      Release 1.58</a>
    </h4>
@ -275,7 +293,7 @@
        </li>
 </ul></div>
 <h4>
-<a name="boost_optional.relnotes.h13"></a>
+<a name="boost_optional.relnotes.h15"></a>
      <span class="phrase"><a name="boost_optional.relnotes.boost_release_1_57"></a></span><a class="link" href="relnotes.html#boost_optional.relnotes.boost_release_1_57">Boost
      Release 1.57</a>
    </h4>
@ -285,7 +303,7 @@
          to fix C++03 compile error on <code class="computeroutput"><span class="identifier">logic_error</span><span class="special">(</span><span class="string">"..."</span><span class="special">)</span></code>"</em></span>.
        </li></ul></div>
 <h4>
-<a name="boost_optional.relnotes.h14"></a>
+<a name="boost_optional.relnotes.h16"></a>
      <span class="phrase"><a name="boost_optional.relnotes.boost_release_1_56"></a></span><a class="link" href="relnotes.html#boost_optional.relnotes.boost_release_1_56">Boost
      Release 1.56</a>
    </h4>
@ -342,7 +360,7 @@
 </div>
 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
 <td align="left"></td>
-<td align="right"><div class="copyright-footer">Copyright © 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright © 2014-2020 Andrzej Krzemieński<p>
+<td align="right"><div class="copyright-footer">Copyright © 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright © 2014-2021 Andrzej Krzemieński<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
      </p>
--- a/doc/html/boost_optional/tutorial/design_overview.html
+++ b/doc/html/boost_optional/tutorial/design_overview.html
@ -170,7 +170,7 @@
 </div>
 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
 <td align="left"></td>
-<td align="right"><div class="copyright-footer">Copyright © 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright © 2014-2020 Andrzej Krzemieński<p>
+<td align="right"><div class="copyright-footer">Copyright © 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright © 2014-2021 Andrzej Krzemieński<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
      </p>
--- a/doc/html/boost_optional/tutorial/design_overview/the_interface.html
+++ b/doc/html/boost_optional/tutorial/design_overview/the_interface.html
@ -173,7 +173,7 @@
 </div>
 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
 <td align="left"></td>
-<td align="right"><div class="copyright-footer">Copyright © 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright © 2014-2020 Andrzej Krzemieński<p>
+<td align="right"><div class="copyright-footer">Copyright © 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright © 2014-2021 Andrzej Krzemieński<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
      </p>
--- a/doc/html/boost_optional/tutorial/design_overview/the_semantics.html
+++ b/doc/html/boost_optional/tutorial/design_overview/the_semantics.html
@ -107,7 +107,7 @@
 </div>
 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
 <td align="left"></td>
-<td align="right"><div class="copyright-footer">Copyright © 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright © 2014-2020 Andrzej Krzemieński<p>
+<td align="right"><div class="copyright-footer">Copyright © 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright © 2014-2021 Andrzej Krzemieński<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
      </p>
--- a/doc/html/boost_optional/tutorial/exception_safety_guarantees.html
+++ b/doc/html/boost_optional/tutorial/exception_safety_guarantees.html
@ -161,7 +161,7 @@
 </div>
 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
 <td align="left"></td>
-<td align="right"><div class="copyright-footer">Copyright © 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright © 2014-2020 Andrzej Krzemieński<p>
+<td align="right"><div class="copyright-footer">Copyright © 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright © 2014-2021 Andrzej Krzemieński<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
      </p>
--- a/doc/html/boost_optional/tutorial/gotchas.html
+++ b/doc/html/boost_optional/tutorial/gotchas.html
@ -98,7 +98,7 @@
 </div>
 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
 <td align="left"></td>
-<td align="right"><div class="copyright-footer">Copyright © 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright © 2014-2020 Andrzej Krzemieński<p>
+<td align="right"><div class="copyright-footer">Copyright © 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright © 2014-2021 Andrzej Krzemieński<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
      </p>
--- a/doc/html/boost_optional/tutorial/gotchas/false_positive_with__wmaybe_uninitialized.html
+++ b/doc/html/boost_optional/tutorial/gotchas/false_positive_with__wmaybe_uninitialized.html
@ -63,7 +63,7 @@
 </div>
 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
 <td align="left"></td>
-<td align="right"><div class="copyright-footer">Copyright © 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright © 2014-2020 Andrzej Krzemieński<p>
+<td align="right"><div class="copyright-footer">Copyright © 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright © 2014-2021 Andrzej Krzemieński<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
      </p>
--- a/doc/html/boost_optional/tutorial/gotchas/mixed_relational_comparisons.html
+++ b/doc/html/boost_optional/tutorial/gotchas/mixed_relational_comparisons.html
@ -45,7 +45,7 @@
 </div>
 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
 <td align="left"></td>
-<td align="right"><div class="copyright-footer">Copyright © 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright © 2014-2020 Andrzej Krzemieński<p>
+<td align="right"><div class="copyright-footer">Copyright © 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright © 2014-2021 Andrzej Krzemieński<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
      </p>
--- a/doc/html/boost_optional/tutorial/gotchas/moved_from__optional_.html
+++ b/doc/html/boost_optional/tutorial/gotchas/moved_from__optional_.html
@ -49,7 +49,7 @@
 </div>
 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
 <td align="left"></td>
-<td align="right"><div class="copyright-footer">Copyright © 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright © 2014-2020 Andrzej Krzemieński<p>
+<td align="right"><div class="copyright-footer">Copyright © 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright © 2014-2021 Andrzej Krzemieński<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
      </p>
--- a/doc/html/boost_optional/tutorial/in_place_factories.html
+++ b/doc/html/boost_optional/tutorial/in_place_factories.html
@ -183,7 +183,7 @@
 </div>
 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
 <td align="left"></td>
-<td align="right"><div class="copyright-footer">Copyright © 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright © 2014-2020 Andrzej Krzemieński<p>
+<td align="right"><div class="copyright-footer">Copyright © 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright © 2014-2021 Andrzej Krzemieński<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
      </p>
--- a/doc/html/boost_optional/tutorial/io_operators.html
+++ b/doc/html/boost_optional/tutorial/io_operators.html
@ -73,7 +73,7 @@
 </div>
 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
 <td align="left"></td>
-<td align="right"><div class="copyright-footer">Copyright © 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright © 2014-2020 Andrzej Krzemieński<p>
+<td align="right"><div class="copyright-footer">Copyright © 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright © 2014-2021 Andrzej Krzemieński<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
      </p>
--- a/doc/html/boost_optional/tutorial/optional_references.html
+++ b/doc/html/boost_optional/tutorial/optional_references.html
@ -103,7 +103,7 @@
 </div>
 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
 <td align="left"></td>
-<td align="right"><div class="copyright-footer">Copyright © 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright © 2014-2020 Andrzej Krzemieński<p>
+<td align="right"><div class="copyright-footer">Copyright © 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright © 2014-2021 Andrzej Krzemieński<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
      </p>
--- a/doc/html/boost_optional/tutorial/optional_references/rebinding_semantics_for_assignment_of_optional_references.html
+++ b/doc/html/boost_optional/tutorial/optional_references/rebinding_semantics_for_assignment_of_optional_references.html
@ -133,7 +133,7 @@
 </div>
 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
 <td align="left"></td>
-<td align="right"><div class="copyright-footer">Copyright © 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright © 2014-2020 Andrzej Krzemieński<p>
+<td align="right"><div class="copyright-footer">Copyright © 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright © 2014-2021 Andrzej Krzemieński<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
      </p>
--- a/doc/html/boost_optional/tutorial/performance_considerations.html
+++ b/doc/html/boost_optional/tutorial/performance_considerations.html
@ -251,7 +251,7 @@
 </div>
 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
 <td align="left"></td>
-<td align="right"><div class="copyright-footer">Copyright © 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright © 2014-2020 Andrzej Krzemieński<p>
+<td align="right"><div class="copyright-footer">Copyright © 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright © 2014-2021 Andrzej Krzemieński<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
      </p>
--- a/doc/html/boost_optional/tutorial/relational_operators.html
+++ b/doc/html/boost_optional/tutorial/relational_operators.html
@ -99,7 +99,7 @@
 </div>
 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
 <td align="left"></td>
-<td align="right"><div class="copyright-footer">Copyright © 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright © 2014-2020 Andrzej Krzemieński<p>
+<td align="right"><div class="copyright-footer">Copyright © 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright © 2014-2021 Andrzej Krzemieński<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
      </p>
--- a/doc/html/boost_optional/tutorial/type_requirements.html
+++ b/doc/html/boost_optional/tutorial/type_requirements.html
@ -95,7 +95,7 @@
 </div>
 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
 <td align="left"></td>
-<td align="right"><div class="copyright-footer">Copyright © 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright © 2014-2020 Andrzej Krzemieński<p>
+<td align="right"><div class="copyright-footer">Copyright © 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright © 2014-2021 Andrzej Krzemieński<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
      </p>
--- a/doc/html/boost_optional/tutorial/when_to_use_optional.html
+++ b/doc/html/boost_optional/tutorial/when_to_use_optional.html
@ -128,7 +128,7 @@
 </div>
 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
 <td align="left"></td>
-<td align="right"><div class="copyright-footer">Copyright © 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright © 2014-2020 Andrzej Krzemieński<p>
+<td align="right"><div class="copyright-footer">Copyright © 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright © 2014-2021 Andrzej Krzemieński<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
      </p>
--- a/doc/html/index.html
+++ b/doc/html/index.html
@ -26,7 +26,7 @@
 <span class="firstname">Fernando Luis</span> <span class="surname">Cacciola Carballal</span>
 </h3></div></div>
 <div><p class="copyright">Copyright © 2003-2007 Fernando Luis Cacciola Carballal</p></div>
-<div><p class="copyright">Copyright © 2014-2020 Andrzej Krzemieński</p></div>
+<div><p class="copyright">Copyright © 2014-2021 Andrzej Krzemieński</p></div>
 <div><div class="legalnotice">
 <a name="optional.legal"></a><p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
@ -145,7 +145,7 @@
 </div>
 </div>
 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
-<td align="left"><p><small>Last revised: December 18, 2020 at 22:54:39 GMT</small></p></td>
+<td align="left"><p><small>Last revised: November 20, 2021 at 00:57:52 GMT</small></p></td>
 <td align="right"><div class="copyright-footer"></div></td>
 </tr></table>
 <hr>
--- a/doc/html/optional/reference.html
+++ b/doc/html/optional/reference.html
@ -75,7 +75,7 @@
 </div>
 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
 <td align="left"></td>
-<td align="right"><div class="copyright-footer">Copyright © 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright © 2014-2020 Andrzej Krzemieński<p>
+<td align="right"><div class="copyright-footer">Copyright © 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright © 2014-2021 Andrzej Krzemieński<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
      </p>
--- a/doc/html/optional/reference/header__boost_optional_optional_hpp_.html
+++ b/doc/html/optional/reference/header__boost_optional_optional_hpp_.html
@ -97,7 +97,7 @@
 </div>
 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
 <td align="left"></td>
-<td align="right"><div class="copyright-footer">Copyright © 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright © 2014-2020 Andrzej Krzemieński<p>
+<td align="right"><div class="copyright-footer">Copyright © 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright © 2014-2021 Andrzej Krzemieński<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
      </p>
--- a/doc/html/optional/tutorial.html
+++ b/doc/html/optional/tutorial.html
@ -139,7 +139,7 @@
 </div>
 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
 <td align="left"></td>
-<td align="right"><div class="copyright-footer">Copyright © 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright © 2014-2020 Andrzej Krzemieński<p>
+<td align="right"><div class="copyright-footer">Copyright © 2003-2007 Fernando Luis Cacciola Carballal<br>Copyright © 2014-2021 Andrzej Krzemieński<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
      </p>
--- a/include/boost/optional/optional.hpp
+++ b/include/boost/optional/optional.hpp
@ -1,5 +1,5 @@
 // Copyright (C) 2003, 2008 Fernando Luis Cacciola Carballal.
-// Copyright (C) 2014 - 2018 Andrzej Krzemienski.
+// Copyright (C) 2014 - 2021 Andrzej Krzemienski.
 //
 // Use, modification, and distribution is subject to the Boost Software
 // License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
@ -18,7 +18,9 @@
 #define BOOST_OPTIONAL_OPTIONAL_FLC_19NOV2002_HPP

 #include <new>
+#ifndef BOOST_NO_IOSTREAM
 #include <iosfwd>
+#endif // BOOST_NO_IOSTREAM

 #ifdef BOOST_OPTIONAL_DETAIL_USE_STD_TYPE_TRAITS
 #  include <type_traits>
@ -35,14 +37,18 @@
 #include <boost/type.hpp>
 #include <boost/type_traits/alignment_of.hpp>
 #include <boost/type_traits/conditional.hpp>
+#include <boost/type_traits/conjunction.hpp>
+#include <boost/type_traits/disjunction.hpp>
 #include <boost/type_traits/has_nothrow_constructor.hpp>
 #include <boost/type_traits/type_with_alignment.hpp>
 #include <boost/type_traits/remove_const.hpp>
 #include <boost/type_traits/remove_reference.hpp>
 #include <boost/type_traits/decay.hpp>
+#include <boost/type_traits/is_assignable.hpp>
 #include <boost/type_traits/is_base_of.hpp>
 #include <boost/type_traits/is_const.hpp>
 #include <boost/type_traits/is_constructible.hpp>
+#include <boost/type_traits/is_convertible.hpp>
 #include <boost/type_traits/is_lvalue_reference.hpp>
 #include <boost/type_traits/is_nothrow_move_assignable.hpp>
 #include <boost/type_traits/is_nothrow_move_constructible.hpp>
@ -123,6 +129,7 @@ class optional_base : public optional_tag
  protected :

    typedef T value_type ;
+    typedef typename boost::remove_const<T>::type unqualified_value_type;

  protected:
    typedef T &       reference_type ;
@ -399,14 +406,14 @@ class optional_base : public optional_tag

    void construct ( argument_type val )
     {
-       ::new (m_storage.address()) value_type(val) ;
+       ::new (m_storage.address()) unqualified_value_type(val) ;
       m_initialized = true ;
     }

 #ifndef  BOOST_OPTIONAL_DETAIL_NO_RVALUE_REFERENCES
    void construct ( rval_reference_type val )
     {
-       ::new (m_storage.address()) value_type( boost::move(val) ) ;
+       ::new (m_storage.address()) unqualified_value_type( boost::move(val) ) ;
       m_initialized = true ;
     }
 #endif
@ -418,7 +425,7 @@ class optional_base : public optional_tag
    template<class... Args>
    void construct ( in_place_init_t, Args&&... args )
    {
-      ::new (m_storage.address()) value_type( boost::forward<Args>(args)... ) ;
+      ::new (m_storage.address()) unqualified_value_type( boost::forward<Args>(args)... ) ;
      m_initialized = true ;
    }

@ -449,13 +456,13 @@ class optional_base : public optional_tag
    template<class Arg>
    void construct ( in_place_init_t, Arg&& arg )
     {
-       ::new (m_storage.address()) value_type( boost::forward<Arg>(arg) );
+       ::new (m_storage.address()) unqualified_value_type( boost::forward<Arg>(arg) );
       m_initialized = true ;
     }

    void construct ( in_place_init_t )
     {
-       ::new (m_storage.address()) value_type();
+       ::new (m_storage.address()) unqualified_value_type();
       m_initialized = true ;
     }

@ -509,20 +516,20 @@ class optional_base : public optional_tag
    template<class Arg>
    void construct ( in_place_init_t, const Arg& arg )
     {
-       ::new (m_storage.address()) value_type( arg );
+       ::new (m_storage.address()) unqualified_value_type( arg );
       m_initialized = true ;
     }

    template<class Arg>
    void construct ( in_place_init_t, Arg& arg )
     {
-       ::new (m_storage.address()) value_type( arg );
+       ::new (m_storage.address()) unqualified_value_type( arg );
       m_initialized = true ;
     }

    void construct ( in_place_init_t )
     {
-       ::new (m_storage.address()) value_type();
+       ::new (m_storage.address()) unqualified_value_type();
       m_initialized = true ;
     }

@ -667,7 +674,7 @@ class optional_base : public optional_tag
    template<class Expr>
    void construct ( Expr&& expr, void const* )
    {
-      new (m_storage.address()) value_type(boost::forward<Expr>(expr)) ;
+      new (m_storage.address()) unqualified_value_type(boost::forward<Expr>(expr)) ;
      m_initialized = true ;
    }

@ -688,7 +695,7 @@ class optional_base : public optional_tag
    template<class Expr>
    void construct ( Expr const& expr, void const* )
     {
-       new (m_storage.address()) value_type(expr) ;
+       new (m_storage.address()) unqualified_value_type(expr) ;
       m_initialized = true ;
     }

@ -726,7 +733,7 @@ class optional_base : public optional_tag
       {
         // An exception can be thrown here.
         // It it happens, THIS will be left uninitialized.
-         new (m_storage.address()) value_type(boost::move(expr.get())) ;
+         new (m_storage.address()) unqualified_value_type(boost::move(expr.get())) ;
         m_initialized = true ;
       }
     }
@ -739,7 +746,7 @@ class optional_base : public optional_tag
       {
         // An exception can be thrown here.
         // It it happens, THIS will be left uninitialized.
-         new (m_storage.address()) value_type(expr.get()) ;
+         new (m_storage.address()) unqualified_value_type(expr.get()) ;
         m_initialized = true ;
       }
     }
@ -779,7 +786,7 @@ class optional_base : public optional_tag

 // definition of metafunction is_optional_val_init_candidate
 template <typename U>
-struct is_optional_related
+struct is_optional_or_tag
  : boost::conditional< boost::is_base_of<optional_detail::optional_tag, BOOST_DEDUCED_TYPENAME boost::decay<U>::type>::value
                     || boost::is_same<BOOST_DEDUCED_TYPENAME boost::decay<U>::type, none_t>::value
                     || boost::is_same<BOOST_DEDUCED_TYPENAME boost::decay<U>::type, in_place_init_t>::value
@ -787,14 +794,22 @@ struct is_optional_related
    boost::true_type, boost::false_type>::type
 {};

+template <typename T, typename U>
+struct has_dedicated_constructor
+  : boost::disjunction<is_optional_or_tag<U>, boost::is_same<T, BOOST_DEDUCED_TYPENAME boost::decay<U>::type> >
+{};
+
+template <typename U>
+struct is_in_place_factory
+  : boost::disjunction< boost::is_base_of<boost::in_place_factory_base, BOOST_DEDUCED_TYPENAME boost::decay<U>::type>,
+                        boost::is_base_of<boost::typed_in_place_factory_base, BOOST_DEDUCED_TYPENAME boost::decay<U>::type> >
+{};
+
 #if !defined(BOOST_OPTIONAL_DETAIL_NO_IS_CONSTRUCTIBLE_TRAIT)

 template <typename T, typename U>
-struct is_convertible_to_T_or_factory
-  : boost::conditional< boost::is_base_of<boost::in_place_factory_base, BOOST_DEDUCED_TYPENAME boost::decay<U>::type>::value
-                     || boost::is_base_of<boost::typed_in_place_factory_base, BOOST_DEDUCED_TYPENAME boost::decay<U>::type>::value
-                     || (boost::is_constructible<T, U&&>::value && !boost::is_same<T, BOOST_DEDUCED_TYPENAME boost::decay<U>::type>::value)
-                      , boost::true_type, boost::false_type>::type
+struct is_factory_or_constructible_to_T
+  : boost::disjunction< is_in_place_factory<U>, boost::is_constructible<T, U&&> >
 {};

 template <typename T, typename U>
@ -804,7 +819,7 @@ struct is_optional_constructible : boost::is_constructible<T, U>
 #else

 template <typename, typename>
-struct is_convertible_to_T_or_factory : boost::true_type
+struct is_factory_or_constructible_to_T : boost::true_type
 {};

 template <typename T, typename U>
@ -813,15 +828,58 @@ struct is_optional_constructible : boost::true_type

 #endif // is_convertible condition

-template <typename T, typename U, bool = is_optional_related<U>::value>
+#if !defined(BOOST_NO_CXX11_DECLTYPE) && !BOOST_WORKAROUND(BOOST_MSVC, < 1800)
+// for is_assignable
+
+#if (!defined BOOST_NO_CXX11_RVALUE_REFERENCES)
+// On some initial rvalue reference implementations GCC does it in a strange way,
+// preferring perfect-forwarding constructor to implicit copy constructor.
+
+template <typename T, typename U>
+struct is_opt_assignable
+  : boost::conjunction<boost::is_convertible<U&&, T>, boost::is_assignable<T&, U&&> >
+{};
+
+#else
+
+template <typename T, typename U>
+struct is_opt_assignable
+  : boost::conjunction<boost::is_convertible<U, T>, boost::is_assignable<T&, U> >
+{};
+
+#endif
+
+#else
+
+template <typename T, typename U>
+struct is_opt_assignable : boost::is_convertible<U, T>
+{};
+
+#endif
+
+template <typename T, typename U>
+struct is_factory_or_opt_assignable_to_T
+  : boost::disjunction< is_in_place_factory<U>, is_opt_assignable<T, U> >
+{};
+
+template <typename T, typename U, bool = has_dedicated_constructor<T, U>::value>
 struct is_optional_val_init_candidate
  : boost::false_type
 {};

 template <typename T, typename U>
 struct is_optional_val_init_candidate<T, U, false>
-  : boost::conditional< is_convertible_to_T_or_factory<T, U>::value
-                      , boost::true_type, boost::false_type>::type
+  : is_factory_or_constructible_to_T<T, U>
+{};
+
+template <typename T, typename U, bool = has_dedicated_constructor<T, U>::value>
+struct is_optional_val_assign_candidate
+  : boost::false_type
+{};
+
+template <typename T, typename U>
+struct is_optional_val_assign_candidate<T, U, false>
+  : is_factory_or_opt_assignable_to_T<T, U>
 {};

 } // namespace optional_detail
@ -994,7 +1052,7 @@ class optional
 #ifndef  BOOST_OPTIONAL_DETAIL_NO_RVALUE_REFERENCES

    template<class Expr>
-    BOOST_DEDUCED_TYPENAME boost::enable_if<optional_detail::is_optional_val_init_candidate<T, Expr>, optional&>::type
+    BOOST_DEDUCED_TYPENAME boost::enable_if<optional_detail::is_optional_val_assign_candidate<T, Expr>, optional&>::type
    operator= ( Expr&& expr )
      {
        this->assign_expr(boost::forward<Expr>(expr),boost::addressof(expr));
@ -1586,6 +1644,7 @@ get_pointer ( optional<T>& opt )

 } // namespace boost

+#ifndef BOOST_NO_IOSTREAM
 namespace boost {

 // The following declaration prevents a bug where operator safe-bool is used upon streaming optional object if you forget the IO header.
@ -1598,6 +1657,7 @@ operator<<(std::basic_ostream<CharType, CharTrait>& os, optional_detail::optiona
 }

 } // namespace boost
+#endif // BOOST_NO_IOSTREAM

 #include <boost/optional/detail/optional_relops.hpp>
 #include <boost/optional/detail/optional_swap.hpp>
--- a/include/boost/optional/optional_io.hpp
+++ b/include/boost/optional/optional_io.hpp
@ -12,6 +12,7 @@
 #ifndef BOOST_OPTIONAL_OPTIONAL_IO_FLC_19NOV2002_HPP
 #define BOOST_OPTIONAL_OPTIONAL_IO_FLC_19NOV2002_HPP

+#ifndef BOOST_NO_IOSTREAM
 #include <istream>
 #include <ostream>

@ -31,7 +32,7 @@ operator<<(std::basic_ostream<CharType, CharTrait>& out, none_t)
  {
    out << "--";
  }
-   
+
  return out;
 }

@ -90,5 +91,5 @@ operator>>(std::basic_istream<CharType, CharTrait>& in, optional<T>& v)

 } // namespace boost

+#endif // BOOST_NO_IOSTREAM
 #endif
-
--- a/test/Jamfile.v2
+++ b/test/Jamfile.v2
@ -22,6 +22,7 @@ import testing ;
    [ run optional_test_swap.cpp ]
    [ run optional_test_conversions_from_U.cpp ]
    [ run optional_test_convert_from_T.cpp ]
+    [ run optional_test_convert_assign.cpp ]
    [ run optional_test_empty_braces.cpp ]
    [ run optional_test_make_optional.cpp ]
    [ run optional_test_flat_map.cpp ]
--- a/test/optional_test.cpp
+++ b/test/optional_test.cpp
@ -12,7 +12,9 @@
 // Revisions:
 // 12 May 2008 (added more swap tests)
 //
+#ifndef BOOST_NO_IOSTREAM
 #include<iostream>
+#endif // BOOST_NO_IOSTREAM
 #include<stdexcept>
 #include<string>

@ -908,7 +910,7 @@ void test_no_implicit_conversions()


 // Test for support for classes with overridden operator&
-class CustomAddressOfClass  
+class CustomAddressOfClass
 {
    int n;

@ -950,5 +952,3 @@ int main()

  return boost::report_errors();
 }
-
-
--- a/test/optional_test_convert_assign.cpp
+++ b/test/optional_test_convert_assign.cpp
@ -0,0 +1,57 @@
+// Copyright (C) 2021 Andrzej Krzemienski.
+//
+// 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)
+//
+// See http://www.boost.org/lib/optional for documentation.
+//
+// You are welcome to contact the author at:
+//  akrzemi1@gmail.com
+
+#include "boost/optional/optional.hpp"
+
+#include "boost/core/lightweight_test.hpp"
+#include "boost/none.hpp"
+
+//#ifndef BOOST_OPTIONAL_NO_CONVERTING_COPY_CTOR
+
+using boost::optional;
+
+struct implicit_bool_conv
+{
+  operator bool() const { return false; }
+};
+
+struct explicit_bool_conv
+{
+  bool operator!() const BOOST_NOEXCEPT { return false; }
+  BOOST_EXPLICIT_OPERATOR_BOOL_NOEXCEPT()
+};
+
+template <typename To, typename From>
+void test_convert_assign()
+{
+  optional<To> oi;
+  oi = From();
+  BOOST_TEST(oi);
+}
+
+void test_no_bad_assignment()
+{
+#if !defined(BOOST_NO_CXX11_DECLTYPE) && !BOOST_WORKAROUND(BOOST_MSVC, < 1800)
+  // this means that type trait `boost::is_assignable` works.
+  BOOST_STATIC_ASSERT((boost::is_assignable<optional<bool>&, bool>::value));
+  BOOST_STATIC_ASSERT((boost::is_assignable<optional<bool>&, implicit_bool_conv>::value));
+  BOOST_STATIC_ASSERT((! boost::is_assignable<optional<bool>&, explicit_bool_conv>::value));
+#endif
+}
+
+int main()
+{
+  test_convert_assign<int, short>();
+  test_convert_assign<bool, implicit_bool_conv>();
+  test_no_bad_assignment();
+
+  return boost::report_errors();
+}
--- a/test/optional_test_io.cpp
+++ b/test/optional_test_io.cpp
@ -10,15 +10,19 @@
 // You are welcome to contact the author at:
 //  fernando_cacciola@hotmail.com

-#include <sstream>
 #include "boost/optional/optional.hpp"
 #include "boost/optional/optional_io.hpp"
+#include "boost/core/lightweight_test.hpp"
+
+#ifndef BOOST_NO_IOSTREAM
+
+#include <sstream>

 #ifdef BOOST_BORLANDC
 #pragma hdrstop
 #endif

-#include "boost/core/lightweight_test.hpp"
+

 using boost::optional;

@ -29,7 +33,7 @@ void test2( Opt o, Opt buff )

  const int markv = 123 ;
  int mark = 0 ;
-  
+
  s << o << " " << markv ;
  s >> buff >> mark ;

@ -85,3 +89,12 @@ int main()

  return boost::report_errors();
 }
+
+#else // BOOST_NO_IOSTREAM
+
+int main()
+{
+  return boost::report_errors();
+}
+
+#endif // BOOST_NO_IOSTREAM
Author	SHA1	Message	Date
Peter Dimov	51b7053abf	Construct the unqualified value_type with placement new	2022-02-18 22:03:05 +02:00
Andrzej Krzemieński	8e86559103	Fix convert-assign tests for C++98	2021-12-22 10:36:40 +01:00
Andrzej Krzemienski	56568445b9	Fix tests on C++03	2021-12-09 22:22:05 +01:00
Andrzej Krzemienski	7dd512a019	Fix issue #98	2021-11-20 02:00:30 +01:00
Andrzej Krzemieński	21253ea63a	Merge pull request #93 from sdarwin/feature/gha_fix_1 Update GitHub Actions CI file	2021-08-03 16:07:09 +02:00
sdarwin	14d43d2e6e	Update GitHub Actions CI file	2021-07-30 16:10:11 +00:00
Peter Dimov	0b159febf8	Update CMakeLists.txt	2021-06-10 00:53:07 +03:00
Andrzej Krzemienski	d0ab8004c0	Add support for BOOST_NO_IOSTREAM	2021-05-19 23:29:10 +02:00