Release 0.9.0 of expected lite introduces marking expected and bad_expected_access as [[nodiscard]] at default. This behaviour can be controlled via nsel_CONFIG_NO_NODISCARD, see section Configuration. See also Mark as [[nodiscard]] over at nonstd-lite project.

It contains the following:

Additions

• Add configuration nsel_CONFIG_NO_NODISCARD (#74, thanks @Quuxplusone).
• Add configuration nsel_CONFIG_WIN32_LEAN_AND_MEAN (#69, thanks @No-needto-recall).

Changes

• Mark expected and bad_expected_access as [[nodiscard]] (default) (#74, thanks @Quuxplusone)
• Target all versions of value() for suppression of MSVC warning C4702 (#81, thanks @rconde01).
• Increment minimum required CMake version to 3.15 of 2020 (#71, thanks @oschonrock).
• Remove unsupported C++98, C++03 from compilation script.
• Introduce std11::addressof (#70, thanks @DNKpp).
• In Readme, update sections 'Algorithms for unexpected_type' and A.2 'Expected lite test specification' (#67).
• Update in-place version of make_unexpected, add it for use with std::expected, add test (#67).
• Add inplace version of make_unexpected (#68, thanks @Leonezz).

Fixes

• Readme: Fix link to license (#78, thanks @dennisschagt).
• Fix failing MSVC build on GitHub Actions (#80, thanks @striezel).
• Fix failing Clang builds on GitHub Actions (#79, thanks @striezel).
• Fix Expected transform (#76, thanks @gogagum).
• Only use [[maybe_unused]] with C++17 and later (#73).
• Silence Visual C++ warning 'discarded return value' in expected.t.cpp(1347) (#74, thanks @Quuxplusone).
• Replace deprecated .value() usage within expected's own code (#73, thanks @Quuxplusone).
• Silence Clang warnings about unused variables. NFC (#73, thanks @Quuxplusone).
• Make sure nsel_CONFIG_WIN32_LEAN_AND_MEAN and nsel_CONFIG_NO_EXCEPTIONS_SEH are defined (#69, thanks @Leonezz).
• In in-place make_unexpected(), return unexpected created via std::move() (#67, thanks @Leonezz).

Full Changelog: v0.8.0...v0.9.0

Release 0.8.0 of expected lite contains the following.

Additions

• Add make_unexpected() for use with std::expected (#66, thanks @psyinf)
• Add unexpected_type (deprecated) for use with std::expected (#66, thanks @psyinf)
• Add unexpected_type::error(), deprecate unexpected_type::value() (#66, thanks @psyinf)

Changes

• Adapt test suite to use with std::expected.

Fixes

• Fix definition of 'unit_select' in batch files.
• Fix test suite's create_copyable() for use with std::expected (#66).

When std::expected is used for the implementation, the following are available via the nonstd namespace:

• std::expected.
• std::unexpected and alias unexpected_type.
• std::bad_expected_access.
• std::unexpect_t.
• std::unexpect.
• make_unexpected().

Full Changelog: v0.7.0...v0.8.0

Release 0.7.0 of expected lite contains the following.

Additions

• Add CPack packaging (#57, thanks @KOLANICH).
• Add monadic operations per P2505 (#60, thanks @szaszm)
• Add reference for p2505, update table 'Comparison with like types' (#60).
• Use -Dnsel_P2505R=0 to disable monadic operations (#61, addendum to #60, thanks @szaszm).

Changes

• Add badge 'on vcpkg' (nonstd-lite-project issue 72.
• Update actions/checkout in GitHub Actions to v4 (#63, thanks @striezel).
• Add (and remove again) workaround for incompatibilities between Clang and libstdc++ (#63, thanks @striezel).

Fixes

• Fix failure to compile non-movable non-copyable expected type (#58, thanks @polasek).
• Fix (locally disable) MSVC warning C4702: unreachable code (#65, thanks @hanusek, @szaszm, @np-c0mp1ete).

Full Changelog: v0.6.3...v0.7.0

Release 0.6.3 of expected lite contains the following.

Fixes

• Fix operator==() for void 'value' type (#51, thanks @Crzyrndm).
• Fix disabling of swap() (#50, thanks @negatratoron).
• Fix cmake config file to use @package_nspace@ (nonstd-lite-project 68).

Changes

• Remove Travis CI configuration and badge (#55, thanks @striezel).
• Do not cancel all jobs in a workflow if one fails. (#54, thanks @striezel).
• Remove gcc 8 and clang 8, 9, 10 from GitHub CI matrix (nonstd-lite-project 69).
• Add compilation and running test for C++20 to GCC and Clang (nonstd-lite-project 64).
• Use toplevel unit_name (nonstd-lite-project 56).

Release 0.6.2 of expected lite contains the following.

Changes

• Change value used with nsel_CPP20_OR_GREATER to 202002L (#49, thanks @xavier2k6).
• Use C++20 library feature test for std::remove_cvref (#48, thanks @purpleKarrot).
• Remove msvc (windows-2016) image from GitHub Actions (nonstd-lite-project issue 61, thanks @xavier2k6).
• Add msvc (windows-2022) image to GitHub Actions (nonstd-lite-project issue 62).

Release 0.6.1 of expected lite fixes the version number (#47).

Files affected:

• CMakeLists.txt
• conanfile.py
• expected.hpp

Release 0.6.0 of expected lite contains the following changes.

Additions:

• Enable importing cmake targets from the build tree (#39, thanks @fbdtemme).
• Add script tc-cl.bat. See also nonstd-lite-project issues 54.
• Add nsel_CONFIG_NO_EXCEPTIONS_SEH configuration flag.
• Update script and test for compilation without exceptions.
• Add example/03-no-exceptions.cpp.
• Introduce GitHub Actions CI.

Changes:

• std::expected appears in C++23, not C++20 (#43, thanks @bigerl).
• Allow to move-assign from move-only unexpected (#40).
• Avoid warning -Wundef for _MSC_VER.
• Change to use SEH at default with MSVC for no C++ exception case.
• Replace _CPPUNWIND with _HAS_EXCEPTIONS (#27, thanks @DBJDBJ). See also nonstd-lite-project issue 48.
• Handle lest test framework as system include to prevent warnings, use autoregister.
• Update Readme guided by markdownlint.

Fixes:

• Fix r-value ref miscompile on MSVC v19.22 (#41, thanks @jacobly0).
• Fix concept checks in the assignment operators (#40, thanks @szaszm).

Release 0.5.0 of expected lite contains the following changes.

Additions:

• Add tweak header support

Changes:

• Change 'on conan' link to refer to conan center
• Add .editorconfig
• Add TortoiseGit integration with GitHub issues
• Add build folder and IDE folders/files to .gitignore (.vs, .vscode, CodeBlocks)
• Add Visual Studio 2019 to the Appveyor build matrix, nonstd lite project issue 47

Fixes:

• Prevent detail::text() to be multiply defined (#37, thanks to @jorticus)

[to be expanded]

This release of expected lite tags its current state. It contains numerous changes and fixes.

[to be expanded]

This release of expected lite improves support for CMake and Conan and contains numerous other changes and fixes.

See also nonstd lite project Improve coherence between lite projects.