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libstdc++: Do not use __is_convertible unconditionally [PR113241]

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The new __is_convertible built-in should only be used after checking
that it's supported.

libstdc++-v3/ChangeLog:

	PR libstdc++/113241
	* include/std/type_traits (is_convertible_v): Guard use of
	built-in with preprocessor check.
This commit is contained in:
Jonathan Wakely 2024-01-05 12:03:22 +00:00
parent 29abd09a74
commit 57fa5b60bb
1 changed files with 5 additions and 0 deletions
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5
libstdc++-v3/include/std/type_traits
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@ -3477,8 +3477,13 @@ template <typename _Tp>
#endif
template <typename _Base, typename _Derived>
inline constexpr bool is_base_of_v = __is_base_of(_Base, _Derived);
#if _GLIBCXX_USE_BUILTIN_TRAIT(__is_convertible)
template <typename _From, typename _To>
inline constexpr bool is_convertible_v = __is_convertible(_From, _To);
#else
template <typename _From, typename _To>
inline constexpr bool is_convertible_v = is_convertible<_From, _To>::value;
#endif
template<typename _Fn, typename... _Args>
inline constexpr bool is_invocable_v = is_invocable<_Fn, _Args...>::value;
template<typename _Fn, typename... _Args>