| //===----------------------------------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef _LIBCPP___TYPE_TRAITS_IS_CONVERTIBLE_H |
| #define _LIBCPP___TYPE_TRAITS_IS_CONVERTIBLE_H |
| |
| #include <__config> |
| #include <__type_traits/integral_constant.h> |
| #include <__type_traits/is_array.h> |
| #include <__type_traits/is_function.h> |
| #include <__type_traits/is_void.h> |
| #include <__type_traits/remove_reference.h> |
| #include <__utility/declval.h> |
| #include <cstddef> |
| |
| #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| # pragma GCC system_header |
| #endif |
| |
| _LIBCPP_BEGIN_NAMESPACE_STD |
| |
| #if __has_builtin(__is_convertible) && !defined(_LIBCPP_USE_IS_CONVERTIBLE_FALLBACK) |
| |
| template <class _T1, class _T2> |
| struct _LIBCPP_TEMPLATE_VIS is_convertible : public integral_constant<bool, __is_convertible(_T1, _T2)> {}; |
| |
| #elif __has_builtin(__is_convertible_to) && !defined(_LIBCPP_USE_IS_CONVERTIBLE_FALLBACK) |
| |
| template <class _T1, class _T2> struct _LIBCPP_TEMPLATE_VIS is_convertible |
| : public integral_constant<bool, __is_convertible_to(_T1, _T2)> {}; |
| |
| // TODO: Remove this fallback when GCC < 13 support is no longer required. |
| // GCC 13 has the __is_convertible built-in. |
| #else // __has_builtin(__is_convertible_to) && !defined(_LIBCPP_USE_IS_CONVERTIBLE_FALLBACK) |
| |
| namespace __is_convertible_imp |
| { |
| template <class _Tp> void __test_convert(_Tp); |
| |
| template <class _From, class _To, class = void> |
| struct __is_convertible_test : public false_type {}; |
| |
| template <class _From, class _To> |
| struct __is_convertible_test<_From, _To, |
| decltype(__is_convertible_imp::__test_convert<_To>(std::declval<_From>()))> : public true_type |
| {}; |
| |
| template <class _Tp, bool _IsArray = is_array<_Tp>::value, |
| bool _IsFunction = is_function<_Tp>::value, |
| bool _IsVoid = is_void<_Tp>::value> |
| struct __is_array_function_or_void {enum {value = 0};}; |
| template <class _Tp> struct __is_array_function_or_void<_Tp, true, false, false> {enum {value = 1};}; |
| template <class _Tp> struct __is_array_function_or_void<_Tp, false, true, false> {enum {value = 2};}; |
| template <class _Tp> struct __is_array_function_or_void<_Tp, false, false, true> {enum {value = 3};}; |
| } |
| |
| template <class _Tp, |
| unsigned = __is_convertible_imp::__is_array_function_or_void<__libcpp_remove_reference_t<_Tp> >::value> |
| struct __is_convertible_check |
| { |
| static const size_t __v = 0; |
| }; |
| |
| template <class _Tp> |
| struct __is_convertible_check<_Tp, 0> |
| { |
| static const size_t __v = sizeof(_Tp); |
| }; |
| |
| template <class _T1, class _T2, |
| unsigned _T1_is_array_function_or_void = __is_convertible_imp::__is_array_function_or_void<_T1>::value, |
| unsigned _T2_is_array_function_or_void = __is_convertible_imp::__is_array_function_or_void<_T2>::value> |
| struct __is_convertible |
| : public integral_constant<bool, |
| __is_convertible_imp::__is_convertible_test<_T1, _T2>::value |
| > |
| {}; |
| |
| template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 0, 1> : public false_type {}; |
| template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 1, 1> : public false_type {}; |
| template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 2, 1> : public false_type {}; |
| template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 3, 1> : public false_type {}; |
| |
| template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 0, 2> : public false_type {}; |
| template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 1, 2> : public false_type {}; |
| template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 2, 2> : public false_type {}; |
| template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 3, 2> : public false_type {}; |
| |
| template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 0, 3> : public false_type {}; |
| template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 1, 3> : public false_type {}; |
| template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 2, 3> : public false_type {}; |
| template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 3, 3> : public true_type {}; |
| |
| template <class _T1, class _T2> struct _LIBCPP_TEMPLATE_VIS is_convertible |
| : public __is_convertible<_T1, _T2> |
| { |
| static const size_t __complete_check1 = __is_convertible_check<_T1>::__v; |
| static const size_t __complete_check2 = __is_convertible_check<_T2>::__v; |
| }; |
| |
| #endif // __has_builtin(__is_convertible_to) && !defined(_LIBCPP_USE_IS_CONVERTIBLE_FALLBACK) |
| |
| #if _LIBCPP_STD_VER >= 17 |
| template <class _From, class _To> |
| inline constexpr bool is_convertible_v = is_convertible<_From, _To>::value; |
| #endif |
| |
| _LIBCPP_END_NAMESPACE_STD |
| |
| #endif // _LIBCPP___TYPE_TRAITS_IS_CONVERTIBLE_H |