29#ifndef _GLIBCXX_TR1_CFENV
30#define _GLIBCXX_TR1_CFENV 1
33#pragma GCC system_header
40#if _GLIBCXX_HAVE_FENV_H
44#ifdef _GLIBCXX_USE_C99_FENV_TR1
58namespace std _GLIBCXX_VISIBILITY(default)
60_GLIBCXX_BEGIN_NAMESPACE_VERSION
69 using ::feclearexcept;
70 using ::fegetexceptflag;
71 using ::feraiseexcept;
72 using ::fesetexceptflag;
84_GLIBCXX_END_NAMESPACE_VERSION
ISO C++ entities toplevel namespace is std.