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_INLINE_VISIBILITY _LIBCPP_CONSTEXPR
25 int __convert_to_integral(int __val) { return __val; }
26 
27 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR
28 unsigned __convert_to_integral(unsigned __val) { return __val; }
29 
30 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR
31 long __convert_to_integral(long __val) { return __val; }
32 
33 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR
34 unsigned long __convert_to_integral(unsigned long __val) { return __val; }
35 
36 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR
37 long long __convert_to_integral(long long __val) { return __val; }
38 
39 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR
40 unsigned long long __convert_to_integral(unsigned long long __val) {return __val; }
41 
42 template<typename _Fp>
43 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR
44 typename enable_if<is_floating_point<_Fp>::value, long long>::type
45  __convert_to_integral(_Fp __val) { return __val; }
46 
47 #ifndef _LIBCPP_HAS_NO_INT128
48 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR
49 __int128_t __convert_to_integral(__int128_t __val) { return __val; }
50 
51 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR
52 __uint128_t __convert_to_integral(__uint128_t __val) { return __val; }
53 #endif
54 
55 template <class _Tp, bool = is_enum<_Tp>::value>
56 struct __sfinae_underlying_type
57 {
58     typedef typename underlying_type<_Tp>::type type;
59     typedef decltype(((type)1) + 0) __promoted_type;
60 };
61 
62 template <class _Tp>
63 struct __sfinae_underlying_type<_Tp, false> {};
64 
65 template <class _Tp>
66 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR
67 typename __sfinae_underlying_type<_Tp>::__promoted_type
68 __convert_to_integral(_Tp __val) { return __val; }
69 
70 _LIBCPP_END_NAMESPACE_STD
71 
72 #endif // _LIBCPP___UTILITY_CONVERT_TO_INTEGRAL_H
73