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
24inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR int __convert_to_integral(int __val) { return __val; }
25
26inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR unsigned __convert_to_integral(unsigned __val) { return __val; }
27
28inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR long __convert_to_integral(long __val) { return __val; }
29
30inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR unsigned long __convert_to_integral(unsigned long __val) {
31 return __val;
32}
33
34inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR long long __convert_to_integral(long long __val) { return __val; }
35
36inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR unsigned long long __convert_to_integral(unsigned long long __val) {
37 return __val;
38}
39
40template <typename _Fp, __enable_if_t<is_floating_point<_Fp>::value, int> = 0>
41inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR long long __convert_to_integral(_Fp __val) {
42 return __val;
43}
44
45#if _LIBCPP_HAS_INT128
46inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR __int128_t __convert_to_integral(__int128_t __val) { return __val; }
47
48inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR __uint128_t __convert_to_integral(__uint128_t __val) { return __val; }
49#endif
50
51template <class _Tp, bool = is_enum<_Tp>::value>
52struct __sfinae_underlying_type {
53 using type = __underlying_type_t<_Tp>;
54 typedef decltype(((type)1) + 0) __promoted_type;
55};
56
57template <class _Tp>
58struct __sfinae_underlying_type<_Tp, false> {};
59
60template <class _Tp>
61inline _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