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Add is_swappable/is_nothrow_swappable traits

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git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@267079 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eric Fiselier
2016-04-21 23:38:59 +00:00
parent a6013cc92f
commit 8f1e73dfd2
19 changed files with 729 additions and 115 deletions
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13
include/utility
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@@ -82,8 +82,8 @@ struct pair
is_nothrow_move_assignable<T2>::value);
template <class U, class V> pair& operator=(pair<U, V>&& p);
void swap(pair& p) noexcept(noexcept(swap(first, p.first)) &&
noexcept(swap(second, p.second)));
void swap(pair& p) noexcept(is_nothrow_swappable_v<T1> &&
is_nothrow_swappable_v<T2>);
};
template <class T1, class T2> bool operator==(const pair<T1,T2>&, const pair<T1,T2>&); // constexpr in C++14
@@ -225,10 +225,6 @@ operator>=(const _Tp& __x, const _Tp& __y)
// swap_ranges
// forward
template<class _Tp, size_t _Np>
inline _LIBCPP_INLINE_VISIBILITY
void swap(_Tp (&__a)[_Np], _Tp (&__b)[_Np]) _NOEXCEPT_(__is_nothrow_swappable<_Tp>::value);
template <class _ForwardIterator1, class _ForwardIterator2>
inline _LIBCPP_INLINE_VISIBILITY
@@ -240,9 +236,12 @@ swap_ranges(_ForwardIterator1 __first1, _ForwardIterator1 __last1, _ForwardItera
return __first2;
}
// forward declared in <type_traits>
template<class _Tp, size_t _Np>
inline _LIBCPP_INLINE_VISIBILITY
void
typename enable_if<
__is_swappable<_Tp>::value
>::type
swap(_Tp (&__a)[_Np], _Tp (&__b)[_Np]) _NOEXCEPT_(__is_nothrow_swappable<_Tp>::value)
{
_VSTD::swap_ranges(__a, __a + _Np, __b);