Add missing _v traits. is_bind_expression_v, is_placeholder_v and uses_allocator_v
llvm-svn: 282126
diff --git a/libcxx/include/__functional_base b/libcxx/include/__functional_base
index 1a08ea2..82b4146 100644
--- a/libcxx/include/__functional_base
+++ b/libcxx/include/__functional_base
@@ -625,6 +625,11 @@
{
};
+#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