Add missing _v traits. is_bind_expression_v, is_placeholder_v and uses_allocator_v

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@282126 91177308-0d34-0410-b5e6-96231b3b80d8
2016-09-22 00:23:15 +00:00
parent fd4a3f6cef
commit 2fffe3a6ff
5 changed files with 62 additions and 10 deletions
--- a/include/__functional_base
+++ b/include/__functional_base
@@ -625,6 +625,11 @@ struct _LIBCPP_TYPE_VIS_ONLY uses_allocator
 {
 };

+#if _LIBCPP_STD_VER > 14
+template <class _Tp, class _Alloc>
+constexpr size_t uses_allocator_v = uses_allocator<_Tp, _Alloc>::value;
+#endif
+
 #ifndef _LIBCPP_HAS_NO_VARIADICS

 // allocator construction