clamp.h 1.2 KB

12345678910111213141516171819202122232425262728293031323334353637383940414243444546
  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. #ifndef _LIBCPP___ALGORITHM_CLAMP_H
  9. #define _LIBCPP___ALGORITHM_CLAMP_H
  10. #include <__algorithm/comp.h>
  11. #include <__assert>
  12. #include <__config>
  13. #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
  14. # pragma GCC system_header
  15. #endif
  16. _LIBCPP_BEGIN_NAMESPACE_STD
  17. #if _LIBCPP_STD_VER > 14
  18. template<class _Tp, class _Compare>
  19. _LIBCPP_NODISCARD_EXT inline
  20. _LIBCPP_INLINE_VISIBILITY constexpr
  21. const _Tp&
  22. clamp(const _Tp& __v, const _Tp& __lo, const _Tp& __hi, _Compare __comp)
  23. {
  24. _LIBCPP_ASSERT(!__comp(__hi, __lo), "Bad bounds passed to std::clamp");
  25. return __comp(__v, __lo) ? __lo : __comp(__hi, __v) ? __hi : __v;
  26. }
  27. template<class _Tp>
  28. _LIBCPP_NODISCARD_EXT inline
  29. _LIBCPP_INLINE_VISIBILITY constexpr
  30. const _Tp&
  31. clamp(const _Tp& __v, const _Tp& __lo, const _Tp& __hi)
  32. {
  33. return _VSTD::clamp(__v, __lo, __hi, __less<_Tp>());
  34. }
  35. #endif
  36. _LIBCPP_END_NAMESPACE_STD
  37. #endif // _LIBCPP___ALGORITHM_CLAMP_H