30 #ifndef _GLIBCXX_EXPERIMENTAL_UTILITY
31 #define _GLIBCXX_EXPERIMENTAL_UTILITY 1
33 #if __cplusplus >= 201402L
35 #include <bits/uses_allocator.h>
39 _GLIBCXX_BEGIN_NAMESPACE_VERSION
41 namespace experimental {
42 inline namespace fundamentals_v2 {
44 using erased_type = std::__erased_type;
48 _GLIBCXX_END_NAMESPACE_VERSION
52 #endif // _GLIBCXX_EXPERIMENTAL_UTILITY