29 #ifndef _GLIBCXX_EXPERIMENTAL_UTILITY
30 #define _GLIBCXX_EXPERIMENTAL_UTILITY 1
33 #include <bits/uses_allocator.h>
37 _GLIBCXX_BEGIN_NAMESPACE_VERSION
39 namespace experimental {
40 inline namespace fundamentals_v2 {
42 using erased_type = std::__erased_type;
46 _GLIBCXX_END_NAMESPACE_VERSION