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Implement P0025R0: 'An algorithm to clamp a value between a pair of boundary values' for C++17

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git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@262871 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Marshall Clow
2016-03-07 22:43:49 +00:00
parent 8d48d9b2cc
commit 3e0808efb8
4 changed files with 150 additions and 2 deletions
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27
include/algorithm
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@@ -543,6 +543,12 @@ template<class T, class Compare>
T
min(initializer_list<T> t, Compare comp); // constexpr in C++14
template<class T>
constexpr const T& clamp( const T& v, const T& lo, const T& hi ); // C++17
template<class T, class Compare>
constexpr const T& clamp( const T& v, const T& lo, const T& hi, Compare comp ); // C++17
template <class ForwardIterator>
ForwardIterator
max_element(ForwardIterator first, ForwardIterator last); // constexpr in C++14
@@ -2657,6 +2663,27 @@ max(initializer_list<_Tp> __t)
#endif // _LIBCPP_HAS_NO_GENERALIZED_INITIALIZERS
#if _LIBCPP_STD_VER > 14
// clamp
template<class _Tp, class _Compare>
inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR
const _Tp&
clamp(const _Tp& __v, const _Tp& __lo, const _Tp& __hi, _Compare __comp)
{
_LIBCPP_ASSERT(!__comp(__hi, __lo), "Bad bounds passed to std::clamp");
return __comp(__v, __lo) ? __lo : __comp(__hi, __v) ? __hi : __v;
}
template<class _Tp>
inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR
const _Tp&
clamp(const _Tp& __v, const _Tp& __lo, const _Tp& __hi)
{
return _VSTD::clamp(__v, __lo, __hi, __less<_Tp>());
}
#endif
// minmax_element
template <class _ForwardIterator, class _Compare>