libstdc++: fenv.h Source File

libstdc++

fenv.h
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1// -*- C++ -*- compatibility header.
2
3// Copyright (C) 2007-2026 Free Software Foundation, Inc.
4//
5// This file is part of the GNU ISO C++ Library. This library is free
6// software; you can redistribute it and/or modify it under the
7// terms of the GNU General Public License as published by the
8// Free Software Foundation; either version 3, or (at your option)
9// any later version.
10
11// This library is distributed in the hope that it will be useful,
12// but WITHOUT ANY WARRANTY; without even the implied warranty of
13// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14// GNU General Public License for more details.
15
16// Under Section 7 of GPL version 3, you are granted additional
17// permissions described in the GCC Runtime Library Exception, version
18// 3.1, as published by the Free Software Foundation.
19
20// You should have received a copy of the GNU General Public License and
21// a copy of the GCC Runtime Library Exception along with this program;
22// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
23// <http://www.gnu.org/licenses/>.
24
25/** @file fenv.h
26 * This is a Standard C++ Library header.
27 */
28
29#ifndef _GLIBCXX_FENV_H
30#define _GLIBCXX_FENV_H 1
31
32#ifdef _GLIBCXX_SYSHDR
33#pragma GCC system_header
34#endif
35
36#pragma GCC diagnostic push
37#pragma GCC diagnostic ignored "-Wpedantic" // include_next
38
39#include <bits/c++config.h>
40#if _GLIBCXX_HAVE_FENV_H
41# include_next <fenv.h>
42#endif
43
44#pragma GCC diagnostic pop
45
46#if __cplusplus >= 201103L
47
48#if _GLIBCXX_USE_C99_FENV
49
50#undef feclearexcept
51#undef fegetexceptflag
52#undef feraiseexcept
53#undef fesetexceptflag
54#undef fetestexcept
55#undef fegetround
56#undef fesetround
57#undef fegetenv
58#undef feholdexcept
59#undef fesetenv
60#undef feupdateenv
61
62namespace std
63{
64 // types
65 using ::fenv_t;
66 using ::fexcept_t;
67
68 // functions
69 using ::feclearexcept;
70 using ::fegetexceptflag;
71 using ::feraiseexcept;
72 using ::fesetexceptflag;
73 using ::fetestexcept;
74
75 using ::fegetround;
76 using ::fesetround;
77
78 using ::fegetenv;
79 using ::feholdexcept;
80 using ::fesetenv;
81 using ::feupdateenv;
82} // namespace
83
84#endif // _GLIBCXX_USE_C99_FENV
85
86#endif // C++11
87
88#endif // _GLIBCXX_FENV_H
c++config.h
std
ISO C++ entities toplevel namespace is std.