xref: /dflybsd-src/contrib/gcc-8.0/libstdc++-v3/include/bits/std_abs.h (revision 38fd149817dfbff97799f62fcb70be98c4e32523) 
1*38fd1498Szrj // -*- C++ -*- C library enhancements header.
2*38fd1498Szrj 
3*38fd1498Szrj // Copyright (C) 2016-2018 Free Software Foundation, Inc.
4*38fd1498Szrj //
5*38fd1498Szrj // This file is part of the GNU ISO C++ Library.  This library is free
6*38fd1498Szrj // software; you can redistribute it and/or modify it under the
7*38fd1498Szrj // terms of the GNU General Public License as published by the
8*38fd1498Szrj // Free Software Foundation; either version 3, or (at your option)
9*38fd1498Szrj // any later version.
10*38fd1498Szrj 
11*38fd1498Szrj // This library is distributed in the hope that it will be useful,
12*38fd1498Szrj // but WITHOUT ANY WARRANTY; without even the implied warranty of
13*38fd1498Szrj // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14*38fd1498Szrj // GNU General Public License for more details.
15*38fd1498Szrj 
16*38fd1498Szrj // Under Section 7 of GPL version 3, you are granted additional
17*38fd1498Szrj // permissions described in the GCC Runtime Library Exception, version
18*38fd1498Szrj // 3.1, as published by the Free Software Foundation.
19*38fd1498Szrj 
20*38fd1498Szrj // You should have received a copy of the GNU General Public License and
21*38fd1498Szrj // a copy of the GCC Runtime Library Exception along with this program;
22*38fd1498Szrj // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
23*38fd1498Szrj // <http://www.gnu.org/licenses/>.
24*38fd1498Szrj 
25*38fd1498Szrj /** @file include/bits/std_abs.h
26*38fd1498Szrj  *  This is an internal header file, included by other library headers.
27*38fd1498Szrj  *  Do not attempt to use it directly. @headername{cmath, cstdlib}
28*38fd1498Szrj  */
29*38fd1498Szrj 
30*38fd1498Szrj #ifndef _GLIBCXX_BITS_STD_ABS_H
31*38fd1498Szrj #define _GLIBCXX_BITS_STD_ABS_H
32*38fd1498Szrj 
33*38fd1498Szrj #pragma GCC system_header
34*38fd1498Szrj 
35*38fd1498Szrj #include <bits/c++config.h>
36*38fd1498Szrj 
37*38fd1498Szrj #define _GLIBCXX_INCLUDE_NEXT_C_HEADERS
38*38fd1498Szrj #include_next <stdlib.h>
39*38fd1498Szrj #ifdef __CORRECT_ISO_CPP_MATH_H_PROTO
40*38fd1498Szrj # include_next <math.h>
41*38fd1498Szrj #endif
42*38fd1498Szrj #undef _GLIBCXX_INCLUDE_NEXT_C_HEADERS
43*38fd1498Szrj 
44*38fd1498Szrj #undef abs
45*38fd1498Szrj 
46*38fd1498Szrj extern "C++"
47*38fd1498Szrj {
_GLIBCXX_VISIBILITY(default)48*38fd1498Szrj namespace std _GLIBCXX_VISIBILITY(default)
49*38fd1498Szrj {
50*38fd1498Szrj _GLIBCXX_BEGIN_NAMESPACE_VERSION
51*38fd1498Szrj 
52*38fd1498Szrj   using ::abs;
53*38fd1498Szrj 
54*38fd1498Szrj #ifndef __CORRECT_ISO_CPP_STDLIB_H_PROTO
55*38fd1498Szrj   inline long
56*38fd1498Szrj   abs(long __i) { return __builtin_labs(__i); }
57*38fd1498Szrj #endif
58*38fd1498Szrj 
59*38fd1498Szrj #ifdef _GLIBCXX_USE_LONG_LONG
60*38fd1498Szrj   inline long long
61*38fd1498Szrj   abs(long long __x) { return __builtin_llabs (__x); }
62*38fd1498Szrj #endif
63*38fd1498Szrj 
64*38fd1498Szrj // _GLIBCXX_RESOLVE_LIB_DEFECTS
65*38fd1498Szrj // 2192. Validity and return type of std::abs(0u) is unclear
66*38fd1498Szrj // 2294. <cstdlib> should declare abs(double)
67*38fd1498Szrj 
68*38fd1498Szrj #ifndef __CORRECT_ISO_CPP_MATH_H_PROTO
69*38fd1498Szrj   inline _GLIBCXX_CONSTEXPR double
70*38fd1498Szrj   abs(double __x)
71*38fd1498Szrj   { return __builtin_fabs(__x); }
72*38fd1498Szrj 
73*38fd1498Szrj   inline _GLIBCXX_CONSTEXPR float
74*38fd1498Szrj   abs(float __x)
75*38fd1498Szrj   { return __builtin_fabsf(__x); }
76*38fd1498Szrj 
77*38fd1498Szrj   inline _GLIBCXX_CONSTEXPR long double
78*38fd1498Szrj   abs(long double __x)
79*38fd1498Szrj   { return __builtin_fabsl(__x); }
80*38fd1498Szrj #endif
81*38fd1498Szrj 
82*38fd1498Szrj #if defined(__GLIBCXX_TYPE_INT_N_0)
83*38fd1498Szrj   inline _GLIBCXX_CONSTEXPR __GLIBCXX_TYPE_INT_N_0
84*38fd1498Szrj   abs(__GLIBCXX_TYPE_INT_N_0 __x) { return __x >= 0 ? __x : -__x; }
85*38fd1498Szrj #endif
86*38fd1498Szrj #if defined(__GLIBCXX_TYPE_INT_N_1)
87*38fd1498Szrj   inline _GLIBCXX_CONSTEXPR __GLIBCXX_TYPE_INT_N_1
88*38fd1498Szrj   abs(__GLIBCXX_TYPE_INT_N_1 __x) { return __x >= 0 ? __x : -__x; }
89*38fd1498Szrj #endif
90*38fd1498Szrj #if defined(__GLIBCXX_TYPE_INT_N_2)
91*38fd1498Szrj   inline _GLIBCXX_CONSTEXPR __GLIBCXX_TYPE_INT_N_2
92*38fd1498Szrj   abs(__GLIBCXX_TYPE_INT_N_2 __x) { return __x >= 0 ? __x : -__x; }
93*38fd1498Szrj #endif
94*38fd1498Szrj #if defined(__GLIBCXX_TYPE_INT_N_3)
95*38fd1498Szrj   inline _GLIBCXX_CONSTEXPR __GLIBCXX_TYPE_INT_N_3
96*38fd1498Szrj   abs(__GLIBCXX_TYPE_INT_N_3 __x) { return __x >= 0 ? __x : -__x; }
97*38fd1498Szrj #endif
98*38fd1498Szrj 
99*38fd1498Szrj #if !defined(__STRICT_ANSI__) && defined(_GLIBCXX_USE_FLOAT128)
100*38fd1498Szrj   inline _GLIBCXX_CONSTEXPR
101*38fd1498Szrj   __float128
102*38fd1498Szrj   abs(__float128 __x)
103*38fd1498Szrj   { return __x < 0 ? -__x : __x; }
104*38fd1498Szrj #endif
105*38fd1498Szrj 
106*38fd1498Szrj _GLIBCXX_END_NAMESPACE_VERSION
107*38fd1498Szrj } // namespace
108*38fd1498Szrj }
109*38fd1498Szrj 
110*38fd1498Szrj #endif // _GLIBCXX_BITS_STD_ABS_H
111