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| author | Tomasz Kamiński <tkaminsk@redhat.com> | 2025-05-12 10:01:22 +0200 |
|---|---|---|
| committer | Tomasz Kamiński <tkaminsk@redhat.com> | 2025-05-14 14:00:47 +0200 |
| commit | 0e93f7cd4ed0cf6bcfda90ed4dcad51a1f65b4b6 (patch) | |
| tree | d9d6d3a5358473fa85a68d1776d3aedea83772f5 /gcc/fortran/dump-parse-tree.cc | |
| parent | 708d40ff109c6e49d02b684a368571722a160af8 (diff) | |
| download | gcc-0e93f7cd4ed0cf6bcfda90ed4dcad51a1f65b4b6.zip gcc-0e93f7cd4ed0cf6bcfda90ed4dcad51a1f65b4b6.tar.gz gcc-0e93f7cd4ed0cf6bcfda90ed4dcad51a1f65b4b6.tar.bz2 | |
libstdc++: Implement C++26 copyable_function [PR119125]
This patch implements C++26 copyable_function as specified in P2548R6.
It also implements LWG 4255 that adjust move_only_function so constructing
from empty copyable_function, produces empty functor. This falls from
existing checks, after specializing __is_polymorphic_function_v for
copyable_function specializations.
For compatible invoker signatures, the move_only_function may be constructed
from copyable_funciton without double indirection. To achieve that we derive
_Cpy_base from _Mo_base, and specialize __is_polymorphic_function_v for
copyable_function. Similary copyable_functions with compatible signatures
can be converted without double indirection.
As we starting to use _Op::_Copy operation from the _M_manage function,
invocations of that functions may now throw exceptions, so noexcept needs
to be removed from the signature of stored _M_manage pointers. This also
affects operations in _Mo_base, however we already wrap _M_manage invocations
in noexcept member functions (_M_move, _M_destroy, swap).
PR libstdc++/119125
libstdc++-v3/ChangeLog:
* doc/doxygen/stdheader.cc: Addded cpyfunc_impl.h header.
* include/Makefile.am: Add bits cpyfunc_impl.h.
* include/Makefile.in: Add bits cpyfunc_impl.h.
* include/bits/cpyfunc_impl.h: New file.
* include/bits/mofunc_impl.h: Mention LWG 4255.
* include/bits/move_only_function.h: Update header description
and change guard to also check __glibcxx_copyable_function.
(_Manager::_Func): Remove noexcept.
(std::__is_polymorphic_function_v<move_only_function<_Tp>>)
(__variant::_Never_valueless_alt<std::move_only_function<_Signature...>>)
(move_only_function) [__glibcxx_move_only_function]: Adjust guard.
(std::__is_polymorphic_function_v<copyable_function<_Tp>>)
(__variant::_Never_valueless_alt<std::copyable_function<_Signature...>>)
(__polyfunc::_Cpy_base, std::copyable_function)
[__glibcxx_copyable_function]: Define.
* include/bits/version.def: Define copyable_function.
* include/bits/version.h: Regenerate.
* include/std/functional: Define __cpp_lib_copyable_function.
* src/c++23/std.cc.in (copyable_function)
[__cpp_lib_copyable_function]: Export.
* testsuite/20_util/copyable_function/call.cc: New test based on
move_only_function tests.
* testsuite/20_util/copyable_function/cons.cc: New test based on
move_only_function tests.
* testsuite/20_util/copyable_function/conv.cc: New test based on
move_only_function tests.
* testsuite/20_util/copyable_function/copy.cc: New test.
* testsuite/20_util/copyable_function/move.cc: New test based on
move_only_function tests.
Reviewed-by: Jonathan Wakely <jwakely@redhat.com>
Signed-off-by: Tomasz Kamiński <tkaminsk@redhat.com>
Diffstat (limited to 'gcc/fortran/dump-parse-tree.cc')
0 files changed, 0 insertions, 0 deletions