1 //===----------------------------------------------------------------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 #ifndef _LIBCPP___UTILITY_CONVERT_TO_INTEGRAL_H 10 #define _LIBCPP___UTILITY_CONVERT_TO_INTEGRAL_H 11 12 #include <__config> 13 #include <__type_traits/enable_if.h> 14 #include <__type_traits/is_enum.h> 15 #include <__type_traits/is_floating_point.h> 16 #include <__type_traits/underlying_type.h> 17 18 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 19 # pragma GCC system_header 20 #endif 21 22 _LIBCPP_BEGIN_NAMESPACE_STD 23 24 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR int __convert_to_integral(int __val) { return __val; } 25 26 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR unsigned __convert_to_integral(unsigned __val) { return __val; } 27 28 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR long __convert_to_integral(long __val) { return __val; } 29 30 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR unsigned long __convert_to_integral(unsigned long __val) { 31 return __val; 32 } 33 34 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR long long __convert_to_integral(long long __val) { return __val; } 35 36 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR unsigned long long __convert_to_integral(unsigned long long __val) { 37 return __val; 38 } 39 40 template <typename _Fp, __enable_if_t<is_floating_point<_Fp>::value, int> = 0> 41 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR long long __convert_to_integral(_Fp __val) { 42 return __val; 43 } 44 45 #ifndef _LIBCPP_HAS_NO_INT128 46 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR __int128_t __convert_to_integral(__int128_t __val) { return __val; } 47 48 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR __uint128_t __convert_to_integral(__uint128_t __val) { return __val; } 49 #endif 50 51 template <class _Tp, bool = is_enum<_Tp>::value> 52 struct __sfinae_underlying_type { 53 typedef typename underlying_type<_Tp>::type type; 54 typedef decltype(((type)1) + 0) __promoted_type; 55 }; 56 57 template <class _Tp> 58 struct __sfinae_underlying_type<_Tp, false> {}; 59 60 template <class _Tp> 61 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR typename __sfinae_underlying_type<_Tp>::__promoted_type 62 __convert_to_integral(_Tp __val) { 63 return __val; 64 } 65 66 _LIBCPP_END_NAMESPACE_STD 67 68 #endif // _LIBCPP___UTILITY_CONVERT_TO_INTEGRAL_H 69