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Use __is_convertible builtin in ustl when available #293

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May 19, 2023
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Use __is_convertible builtin in ustl when available #293

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11 changes: 10 additions & 1 deletion common/include/ustl/uttraits.h
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Original file line number Diff line number Diff line change
Expand Up @@ -428,7 +428,16 @@ UNARY_TRAIT_DEFB (has_trivial_copy_assign, __has_trivial_assign(T));
template <typename T, typename U> struct is_same : public false_type {};
template <typename T> struct is_same<T,T> : public true_type {};

#if __clang__ // clang has __is_convertible builtin
#if defined __has_builtin
#if __has_builtin (__is_convertible)
#define USTL_BUILTIN__is_convertible 1
#endif
#endif
#ifndef USTL_BUILTIN__is_convertible
#define USTL_BUILTIN__is_convertible 0
#endif

#if __clang__ || USTL_BUILTIN__is_convertible == 1 // clang, gcc >= 13 have __is_convertible builtin

template <typename F, typename T>
struct is_convertible : public integral_constant<bool, __is_convertible(F, T)> {};
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