29 #ifndef _GLIBCXX_EXPERIMENTAL_UTILITY
30 #define _GLIBCXX_EXPERIMENTAL_UTILITY 1
33 #include <bits/uses_allocator.h>
36 namespace experimental {
37 inline namespace fundamentals_v2 {
38 _GLIBCXX_BEGIN_NAMESPACE_VERSION
41 using erased_type = std::__erased_type;
43 _GLIBCXX_END_NAMESPACE_VERSION