30#ifndef _GLIBCXX_EXPERIMENTAL_UTILITY
31#define _GLIBCXX_EXPERIMENTAL_UTILITY 1
35#if __cplusplus >= 201402L
37#include <bits/uses_allocator.h>
41_GLIBCXX_BEGIN_NAMESPACE_VERSION
43namespace experimental {
44inline namespace fundamentals_v2 {
46 using erased_type = std::__erased_type;
50_GLIBCXX_END_NAMESPACE_VERSION
ISO C++ entities toplevel namespace is std.