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Detect support for P1084's changes to compound-requirements #75

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Detect support for P1084's changes to compound-requirements #75

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18 changes: 15 additions & 3 deletions include/meta/meta_fwd.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -161,6 +161,9 @@
#else
#define META_CONCEPT concept
#define META_CONCEPT_BARRIER(...) __VA_ARGS__
#if __cpp_concepts >= 201811L
#define META_HAS_P1084
#endif
#endif
#define META_TYPE_CONSTRAINT(...) __VA_ARGS__
#else
Expand Down Expand Up @@ -266,20 +269,29 @@ namespace meta
&& std::is_integral_v<typename T::value_type>
&& requires
{
// { T::value } -> Same<const typename T::value_type&>;
#ifdef META_HAS_P1084
{ T::value } -> Same<const typename T::value_type&>;
#else
T::value;
requires Same<decltype(T::value), const typename T::value_type>;
#endif
typename detail::require_constant<T::value>;

// { T::type::value } -> Same<const typename T::value_type&>;
#ifdef META_HAS_P1084
{ T::type::value } -> Same<const typename T::value_type&>;
#else
T::type::value;
requires Same<decltype(T::type::value), const typename T::value_type>;
#endif
typename detail::require_constant<T::type::value>;
requires T::value == T::type::value;

// { T{}() } -> Same<typename T::value_type>;
#ifdef META_HAS_P1084
{ T{}() } -> Same<typename T::value_type>;
#else
T{}();
requires Same<decltype(T{}()), typename T::value_type>;
#endif
typename detail::require_constant<T{}()>;
requires T{}() == T::value;

Expand Down