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_CLAMP_H
10 #define _LIBCPP___ALGORITHM_CLAMP_H
11 
12 #include <__algorithm/comp.h>
13 #include <__assert>
14 #include <__config>
15 
16 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
17 #  pragma GCC system_header
18 #endif
19 
20 _LIBCPP_BEGIN_NAMESPACE_STD
21 
22 #if _LIBCPP_STD_VER >= 17
23 template<class _Tp, class _Compare>
24 _LIBCPP_NODISCARD_EXT inline
25 _LIBCPP_INLINE_VISIBILITY constexpr
26 const _Tp&
27 clamp(const _Tp& __v, const _Tp& __lo, const _Tp& __hi, _Compare __comp)
28 {
29     _LIBCPP_ASSERT_UNCATEGORIZED(!__comp(__hi, __lo), "Bad bounds passed to std::clamp");
30     return __comp(__v, __lo) ? __lo : __comp(__hi, __v) ? __hi : __v;
31 
32 }
33 
34 template<class _Tp>
35 _LIBCPP_NODISCARD_EXT inline
36 _LIBCPP_INLINE_VISIBILITY constexpr
37 const _Tp&
38 clamp(const _Tp& __v, const _Tp& __lo, const _Tp& __hi)
39 {
40     return _VSTD::clamp(__v, __lo, __hi, __less<>());
41 }
42 #endif
43 
44 _LIBCPP_END_NAMESPACE_STD
45 
46 #endif // _LIBCPP___ALGORITHM_CLAMP_H
47