34#ifndef _GLIBCXX_EXPERIMENTAL_CHRONO
35#define _GLIBCXX_EXPERIMENTAL_CHRONO 1
37#pragma GCC system_header
39#if __cplusplus >= 201402L
44namespace std _GLIBCXX_VISIBILITY(default)
46_GLIBCXX_BEGIN_NAMESPACE_VERSION
51inline namespace fundamentals_v1
54template <
typename _Rep>
55 constexpr bool treat_as_floating_point_v =
56 treat_as_floating_point<_Rep>::value;
60_GLIBCXX_END_NAMESPACE_VERSION
ISO C++ entities toplevel namespace is std.