46#pragma GCC system_header
50namespace std _GLIBCXX_VISIBILITY(default)
52_GLIBCXX_BEGIN_NAMESPACE_VERSION
67 class allocator<void>;
69#if __cplusplus >= 201103L
71 template<
typename,
typename>
72 struct uses_allocator;
77_GLIBCXX_END_NAMESPACE_VERSION
ISO C++ entities toplevel namespace is std.