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Add __is_inplace_type metafunction helper

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git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@276556 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eric Fiselier
2016-07-24 07:42:13 +00:00
parent b90f9db20e
commit 15d8a56532
1 changed files with 5 additions and 0 deletions
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5
include/utility
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@@ -849,6 +849,11 @@ inline in_place_tag in_place(__in_place_index_tag<_Nx>) {
return in_place_tag(__in_place_tag{});
}
template <class _Tp> struct __is_inplace_type : false_type {};
template <> struct __is_inplace_type<in_place_t> : true_type {};
template <class _Tp> struct __is_inplace_type<in_place_type_t<_Tp>> : true_type {};
template <size_t _Idx> struct __is_inplace_type<in_place_index_t<_Idx>> : true_type {};
#endif // _LIBCPP_STD_VER > 14
_LIBCPP_END_NAMESPACE_STD