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
43 namespace experimental {
44 inline namespace fundamentals_v2 {
46 using erased_type = std::__erased_type;
50 _GLIBCXX_END_NAMESPACE_VERSION
ISO C++ entities toplevel namespace is std.