libstdc++
fenv.h
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1 // -*- C++ -*- compatibility header.
2 
3 // Copyright (C) 2007-2025 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 
62 namespace 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
ISO C++ entities toplevel namespace is std.