29#ifndef _GLIBCXX_TR1_CFENV
30#define _GLIBCXX_TR1_CFENV 1
32#pragma GCC system_header
36#if _GLIBCXX_HAVE_FENV_H
40#ifdef _GLIBCXX_USE_C99_FENV_TR1
54namespace std _GLIBCXX_VISIBILITY(default)
56_GLIBCXX_BEGIN_NAMESPACE_VERSION
65 using ::feclearexcept;
66 using ::fegetexceptflag;
67 using ::feraiseexcept;
68 using ::fesetexceptflag;
80_GLIBCXX_END_NAMESPACE_VERSION
ISO C++ entities toplevel namespace is std.