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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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16
include/array
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@@ -34,7 +34,7 @@ struct array
// No explicit construct/copy/destroy for aggregate type
void fill(const T& u);
void swap(array& a) noexcept(noexcept(swap(declval<T&>(), declval<T&>())));
void swap(array& a) noexcept(is_nothrow_swappable_v<T>);
// iterators:
iterator begin() noexcept;
@@ -141,8 +141,15 @@ struct _LIBCPP_TYPE_VIS_ONLY array
_LIBCPP_INLINE_VISIBILITY void fill(const value_type& __u)
{_VSTD::fill_n(__elems_, _Size, __u);}
_LIBCPP_INLINE_VISIBILITY
void swap(array& __a) _NOEXCEPT_(__is_nothrow_swappable<_Tp>::value)
{_VSTD::swap_ranges(__elems_, __elems_ + _Size, __a.__elems_);}
void swap(array& __a) _NOEXCEPT_(_Size == 0 || __is_nothrow_swappable<_Tp>::value)
{ __swap_dispatch((std::integral_constant<bool, _Size == 0>()), __a); }
_LIBCPP_INLINE_VISIBILITY
void __swap_dispatch(std::true_type, array&) {}
_LIBCPP_INLINE_VISIBILITY
void __swap_dispatch(std::false_type, array& __a)
{ _VSTD::swap_ranges(__elems_, __elems_ + _Size, __a.__elems_);}
// iterators:
_LIBCPP_INLINE_VISIBILITY
@@ -276,11 +283,12 @@ template <class _Tp, size_t _Size>
inline _LIBCPP_INLINE_VISIBILITY
typename enable_if
<
_Size == 0 ||
__is_swappable<_Tp>::value,
void
>::type
swap(array<_Tp, _Size>& __x, array<_Tp, _Size>& __y)
_NOEXCEPT_(__is_nothrow_swappable<_Tp>::value)
_NOEXCEPT_(noexcept(__x.swap(__y)))
{
__x.swap(__y);
}