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[libc++] P2944R3: Constrained comparisons - update reference_wrapper implementation #139368

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Merged
merged 21 commits into from
Jun 15, 2025
Merged

[libc++] P2944R3: Constrained comparisons - update reference_wrapper implementation #139368

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61e16a8
[libc++] P2944R3: Constrained comparisions - the `optional` and `refe…
H-G-Hristov Apr 30, 2025
37b9041
NFC refactoring of `std::expected` tests
H-G-Hristov May 9, 2025
47b9765
Tests + fixes
H-G-Hristov May 10, 2025
58149a6
Cleanup
H-G-Hristov May 10, 2025
4e3c8c6
Refactorings
H-G-Hristov May 10, 2025
e94dd67
Fixed formatting
H-G-Hristov May 10, 2025
ab801b4
Include generator script results
H-G-Hristov May 10, 2025
77fb360
Try to fix CI
H-G-Hristov May 10, 2025
f0bfc2b
Update libcxx/test/std/utilities/utility/pairs/pairs.spec/comparison.…
H-G-Hristov May 10, 2025
35c0631
Try to fix CI
H-G-Hristov May 10, 2025
4f009b5
Fix `<optional>`
H-G-Hristov May 10, 2025
f81457f
Try to fix CI
H-G-Hristov May 10, 2025
7181c8c
More fixes
H-G-Hristov May 10, 2025
3a63752
Merge branch 'main' into hgh/libcxx/P2944R3-optional-constrained-equa…
H-G-Hristov Jun 4, 2025
4e1e312
Removed `optional` changes
H-G-Hristov Jun 4, 2025
e17ef64
Update libcxx/docs/Status/Cxx2cPapers.csv
H-G-Hristov Jun 4, 2025
02e41b1
Merge branch 'main' into hgh/libcxx/P2944R3-optional-constrained-equa…
H-G-Hristov Jun 4, 2025
99ccb38
Merge branch 'main' into hgh/libcxx/P2944R3-optional-constrained-equa…
Zingam Jun 4, 2025
5c79e4f
Update libcxx/docs/Status/Cxx2cPapers.csv
Zingam Jun 11, 2025
8a047e6
Merge branch 'main' into hgh/libcxx/P2944R3-optional-constrained-equa…
H-G-Hristov Jun 12, 2025
6512405
Revert changes to `std::expected`
H-G-Hristov Jun 12, 2025
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2 changes: 1 addition & 1 deletion libcxx/docs/Status/Cxx2cPapers.csv
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Original file line number Diff line number Diff line change
Expand Up @@ -59,7 +59,7 @@
"`P2248R8 <https://wg21.link/P2248R8>`__","Enabling list-initialization for algorithms","2024-03 (Tokyo)","","",""
"`P2810R4 <https://wg21.link/P2810R4>`__","``is_debugger_present`` ``is_replaceable``","2024-03 (Tokyo)","","",""
"`P1068R11 <https://wg21.link/P1068R11>`__","Vector API for random number generation","2024-03 (Tokyo)","","",""
"`P2944R3 <https://wg21.link/P2944R3>`__","Comparisons for ``reference_wrapper``","2024-03 (Tokyo)","|Partial|","","Implemented changes to ``reference_wrapper`` and ``pair``"
"`P2944R3 <https://wg21.link/P2944R3>`__","Comparisons for ``reference_wrapper``","2024-03 (Tokyo)","|Partial|","","Not implemented ``tuple`` and ``variant``"
"`P2642R6 <https://wg21.link/P2642R6>`__","Padded ``mdspan`` layouts","2024-03 (Tokyo)","","",""
"`P3029R1 <https://wg21.link/P3029R1>`__","Better ``mdspan``'s CTAD","2024-03 (Tokyo)","|Complete|","19",""
"","","","","",""
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8 changes: 4 additions & 4 deletions libcxx/include/__functional/reference_wrapper.h
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Expand Up @@ -11,14 +11,14 @@
#define _LIBCPP___FUNCTIONAL_REFERENCE_WRAPPER_H

#include <__compare/synth_three_way.h>
#include <__concepts/boolean_testable.h>
#include <__config>
#include <__functional/weak_result_type.h>
#include <__memory/addressof.h>
#include <__type_traits/desugars_to.h>
#include <__type_traits/enable_if.h>
#include <__type_traits/invoke.h>
#include <__type_traits/is_const.h>
#include <__type_traits/is_core_convertible.h>
#include <__type_traits/remove_cvref.h>
#include <__type_traits/void_t.h>
#include <__utility/declval.h>
Expand Down Expand Up @@ -75,23 +75,23 @@ class reference_wrapper : public __weak_result_type<_Tp> {

_LIBCPP_HIDE_FROM_ABI friend constexpr bool operator==(reference_wrapper __x, reference_wrapper __y)
requires requires {
{ __x.get() == __y.get() } -> __boolean_testable;
{ __x.get() == __y.get() } -> __core_convertible_to<bool>;
}
{
return __x.get() == __y.get();
}

_LIBCPP_HIDE_FROM_ABI friend constexpr bool operator==(reference_wrapper __x, const _Tp& __y)
requires requires {
{ __x.get() == __y } -> __boolean_testable;
{ __x.get() == __y } -> __core_convertible_to<bool>;
}
{
return __x.get() == __y;
}

_LIBCPP_HIDE_FROM_ABI friend constexpr bool operator==(reference_wrapper __x, reference_wrapper<const _Tp> __y)
requires(!is_const_v<_Tp>) && requires {
{ __x.get() == __y.get() } -> __boolean_testable;
{ __x.get() == __y.get() } -> __core_convertible_to<bool>;
}
{
return __x.get() == __y.get();
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