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portability macro for checking whether an expression satisfies a concept in a _CCCL_REQUIRES_EXPR clause #6890

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Merged
ericniebler merged 1 commit into from
Dec 5, 2025
+35 −16
Merged

portability macro for checking whether an expression satisfies a concept in a _CCCL_REQUIRES_EXPR clause #6890

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27 changes: 23 additions & 4 deletions libcudacxx/include/cuda/std/__concepts/concept_macros.h
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Original file line number Diff line number Diff line change
Expand Up @@ -146,12 +146,14 @@ namespace __cccl_unqualified_cuda_std = ::cuda::std; // NOLINT(misc-unused-alias
// - requires(BOOL-EXPR...)
// - typename(TYPE...)
// - _Same_as(TYPE...) EXPR...
// - _Satisfies(CONCEPT...) EXPR...
//
// The last 4 are handled below:
#define _CCCL_CONCEPT_REQUIREMENT_SWITCH_requires _CCCL_PP_CASE(REQUIRES)
#define _CCCL_CONCEPT_REQUIREMENT_SWITCH_noexcept _CCCL_PP_CASE(NOEXCEPT)
#define _CCCL_CONCEPT_REQUIREMENT_SWITCH_typename _CCCL_PP_CASE(TYPENAME)
#define _CCCL_CONCEPT_REQUIREMENT_SWITCH__Same_as _CCCL_PP_CASE(SAME_AS)
#define _CCCL_CONCEPT_REQUIREMENT_SWITCH_requires _CCCL_PP_CASE(REQUIRES)
#define _CCCL_CONCEPT_REQUIREMENT_SWITCH_noexcept _CCCL_PP_CASE(NOEXCEPT)
#define _CCCL_CONCEPT_REQUIREMENT_SWITCH_typename _CCCL_PP_CASE(TYPENAME)
#define _CCCL_CONCEPT_REQUIREMENT_SWITCH__Same_as _CCCL_PP_CASE(SAME_AS)
#define _CCCL_CONCEPT_REQUIREMENT_SWITCH__Satisfies _CCCL_PP_CASE(SATISFIES)

// Converts "requires(ARGS...)" to "ARGS..."
#define _CCCL_CONCEPT_EAT_REQUIRES_(...) _CCCL_PP_CAT(_CCCL_CONCEPT_EAT_REQUIRES_, __VA_ARGS__)
Expand Down Expand Up @@ -183,6 +185,18 @@ namespace __cccl_unqualified_cuda_std = ::cuda::std; // NOLINT(misc-unused-alias
_CCCL_PP_EVAL(_CCCL_PP_FIRST, _CCCL_PP_CAT(_CCCL_CONCEPT_GET_TYPE_FROM_SAME_AS_, __VA_ARGS__)))
#define _CCCL_CONCEPT_GET_TYPE_FROM_SAME_AS__Same_as(...) EXPAND(__VA_ARGS__),

// Converts "_Satisfies(TYPE) EXPR..." to "EXPR..."
#define _CCCL_CONCEPT_EAT_SATISFIES_(...) _CCCL_PP_CAT(_CCCL_CONCEPT_EAT_SATISFIES_, __VA_ARGS__)
#define _CCCL_CONCEPT_EAT_SATISFIES__Satisfies(...)

// Converts "_Satisfies(TYPE) EXPR..." to "TYPE" (The ridiculous concatenation of _CCCL_PP_
// with EXPAND(__VA_ARGS__) is the only way to get MSVC's broken preprocessor to do macro
// expansion here.)
#define _CCCL_CONCEPT_GET_CONCEPT_FROM_SATISFIES_(...) \
_CCCL_PP_CAT(_CCCL_PP_, \
_CCCL_PP_EVAL(_CCCL_PP_FIRST, _CCCL_PP_CAT(_CCCL_CONCEPT_GET_CONCEPT_FROM_SATISFIES_, __VA_ARGS__)))
#define _CCCL_CONCEPT_GET_CONCEPT_FROM_SATISFIES__Satisfies(...) EXPAND(__VA_ARGS__),

// Here are the implementations of the internal macros, first for when concepts
// are available, and then for when they're not.
#if _CCCL_HAS_CONCEPTS() || defined(_CCCL_DOXYGEN_INVOKED)
Expand All @@ -207,6 +221,8 @@ namespace __cccl_unqualified_cuda_std = ::cuda::std; // NOLINT(misc-unused-alias
_CCCL_CONCEPT_TRY_ADD_TYPENAME_(_CCCL_CONCEPT_EAT_TYPENAME_(_REQ))
# define _CCCL_CONCEPT_REQUIREMENT_CASE_SAME_AS(_REQ) \
{_CCCL_CONCEPT_EAT_SAME_AS_(_REQ)}->_CCCL_CONCEPT_VSTD::same_as<_CCCL_CONCEPT_GET_TYPE_FROM_SAME_AS_(_REQ)>
# define _CCCL_CONCEPT_REQUIREMENT_CASE_SATISFIES(_REQ) \
{_CCCL_CONCEPT_EAT_SATISFIES_(_REQ)}->_CCCL_CONCEPT_GET_CONCEPT_FROM_SATISFIES_(_REQ)

# define _CCCL_FRAGMENT(_NAME, ...) _NAME<__VA_ARGS__>

Expand Down Expand Up @@ -251,6 +267,9 @@ namespace __cccl_unqualified_cuda_std = ::cuda::std; // NOLINT(misc-unused-alias
static_cast<::__cccl_tag<_CCCL_CONCEPT_EAT_TYPENAME_(_REQ)>*>(nullptr)
# define _CCCL_CONCEPT_REQUIREMENT_CASE_SAME_AS(_REQ) \
::__cccl_requires<::cuda::std::same_as<_CCCL_CONCEPT_SAME_AS_REQUIREMENT_(_REQ)>>
# define _CCCL_CONCEPT_REQUIREMENT_CASE_SATISFIES(_REQ) \
::__cccl_requires < _CCCL_CONCEPT_GET_CONCEPT_FROM_SATISFIES_(_REQ) < decltype(_CCCL_CONCEPT_EAT_SATISFIES_(_REQ)) \
>>

// Converts "_Same_as(TYPE) EXPR..." to "TYPE, decltype(EXPR...)"
# define _CCCL_CONCEPT_SAME_AS_REQUIREMENT_(_REQ) \
Expand Down
8 changes: 4 additions & 4 deletions libcudacxx/include/cuda/std/__concepts/equality_comparable.h
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Expand Up @@ -65,10 +65,10 @@ _CCCL_CONCEPT_FRAGMENT(
requires(__make_const_lvalue_ref<_Tp> __t, __make_const_lvalue_ref<_Up> __u)(
requires(_With_lvalue_reference<_Tp>),
requires(_With_lvalue_reference<_Up>),
requires(__boolean_testable<decltype(__t == __u)>),
requires(__boolean_testable<decltype(__t != __u)>),
requires(__boolean_testable<decltype(__u == __t)>),
requires(__boolean_testable<decltype(__u != __t)>)));
_Satisfies(__boolean_testable) __t == __u,
_Satisfies(__boolean_testable) __t != __u,
_Satisfies(__boolean_testable) __u == __t,
_Satisfies(__boolean_testable) __u != __t));

template <class _Tp, class _Up>
_CCCL_CONCEPT __weakly_equality_comparable_with = _CCCL_FRAGMENT(__weakly_equality_comparable_with_, _Tp, _Up);
Expand Down
16 changes: 8 additions & 8 deletions libcudacxx/include/cuda/std/__concepts/totally_ordered.h
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Original file line number Diff line number Diff line change
Expand Up @@ -61,14 +61,14 @@ template <class _Tp, class _Up>
_CCCL_CONCEPT_FRAGMENT(
__partially_ordered_with_,
requires(__make_const_lvalue_ref<_Tp> __t, __make_const_lvalue_ref<_Up> __u)(
requires(__boolean_testable<decltype(__t < __u)>),
requires(__boolean_testable<decltype(__t > __u)>),
requires(__boolean_testable<decltype(__t <= __u)>),
requires(__boolean_testable<decltype(__t >= __u)>),
requires(__boolean_testable<decltype(__u < __t)>),
requires(__boolean_testable<decltype(__u > __t)>),
requires(__boolean_testable<decltype(__u <= __t)>),
requires(__boolean_testable<decltype(__u >= __t)>)));
_Satisfies(__boolean_testable)(__t < __u), //
_Satisfies(__boolean_testable)(__t > __u), //
_Satisfies(__boolean_testable)(__t <= __u), //
_Satisfies(__boolean_testable)(__t >= __u), //
_Satisfies(__boolean_testable)(__u < __t), //
_Satisfies(__boolean_testable)(__u > __t), //
_Satisfies(__boolean_testable)(__u <= __t), //
_Satisfies(__boolean_testable)(__u >= __t)));

template <class _Tp, class _Up>
_CCCL_CONCEPT __partially_ordered_with = _CCCL_FRAGMENT(__partially_ordered_with_, _Tp, _Up);
Expand Down
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