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comparison libcxx/include/__algorithm/ranges_clamp.h @ 236:c4bab56944e8 llvm-original

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LLVM 16
author kono
date Wed, 09 Nov 2022 17:45:10 +0900
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children 1f2b6ac9f198
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232:70dce7da266c 236:c4bab56944e8
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___ALGORITHM_RANGES_CLAMP_H
10 #define _LIBCPP___ALGORITHM_RANGES_CLAMP_H
11
12 #include <__assert>
13 #include <__config>
14 #include <__functional/identity.h>
15 #include <__functional/invoke.h>
16 #include <__functional/ranges_operations.h>
17 #include <__iterator/concepts.h>
18 #include <__iterator/projected.h>
19 #include <__utility/forward.h>
20
21 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
22 # pragma GCC system_header
23 #endif
24
25 #if _LIBCPP_STD_VER > 17
26
27 _LIBCPP_BEGIN_NAMESPACE_STD
28
29 namespace ranges {
30 namespace __clamp {
31 struct __fn {
32
33 template <class _Type,
34 class _Proj = identity,
35 indirect_strict_weak_order<projected<const _Type*, _Proj>> _Comp = ranges::less>
36 _LIBCPP_HIDE_FROM_ABI constexpr
37 const _Type& operator()(const _Type& __value,
38 const _Type& __low,
39 const _Type& __high,
40 _Comp __comp = {},
41 _Proj __proj = {}) const {
42 _LIBCPP_ASSERT(!bool(std::invoke(__comp, std::invoke(__proj, __high), std::invoke(__proj, __low))),
43 "Bad bounds passed to std::ranges::clamp");
44
45 if (std::invoke(__comp, std::invoke(__proj, __value), std::invoke(__proj, __low)))
46 return __low;
47 else if (std::invoke(__comp, std::invoke(__proj, __high), std::invoke(__proj, __value)))
48 return __high;
49 else
50 return __value;
51 }
52
53 };
54 } // namespace __clamp
55
56 inline namespace __cpo {
57 inline constexpr auto clamp = __clamp::__fn{};
58 } // namespace __cpo
59 } // namespace ranges
60
61 _LIBCPP_END_NAMESPACE_STD
62
63 #endif // _LIBCPP_STD_VER > 17
64
65 #endif // _LIBCPP___ALGORITHM_RANGES_CLAMP_H