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