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       1             : // -*- C++ -*- C library enhancements header.
       2             : 
       3             : // Copyright (C) 2016-2017 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 include/bits/std_abs.h
      26             :  *  This is an internal header file, included by other library headers.
      27             :  *  Do not attempt to use it directly. @headername{cmath, cstdlib}
      28             :  */
      29             : 
      30             : #ifndef _GLIBCXX_BITS_STD_ABS_H
      31             : #define _GLIBCXX_BITS_STD_ABS_H
      32             : 
      33             : #pragma GCC system_header
      34             : 
      35             : #include <bits/c++config.h>
      36             : 
      37             : #define _GLIBCXX_INCLUDE_NEXT_C_HEADERS
      38             : #include_next <stdlib.h>
      39             : #ifdef __CORRECT_ISO_CPP_MATH_H_PROTO
      40             : # include_next <math.h>
      41             : #endif
      42             : #undef _GLIBCXX_INCLUDE_NEXT_C_HEADERS
      43             : 
      44             : #undef abs
      45             : 
      46             : extern "C++"
      47             : {
      48             : namespace std _GLIBCXX_VISIBILITY(default)
      49             : {
      50             : _GLIBCXX_BEGIN_NAMESPACE_VERSION
      51             : 
      52             :   using ::abs;
      53             : 
      54             : #ifndef __CORRECT_ISO_CPP_STDLIB_H_PROTO
      55             :   inline long
      56             :   abs(long __i) { return __builtin_labs(__i); }
      57             : #endif
      58             : 
      59             : #ifdef _GLIBCXX_USE_LONG_LONG
      60             :   inline long long
      61             :   abs(long long __x) { return __builtin_llabs (__x); }
      62             : #endif
      63             : 
      64             : // _GLIBCXX_RESOLVE_LIB_DEFECTS
      65             : // 2192. Validity and return type of std::abs(0u) is unclear
      66             : // 2294. <cstdlib> should declare abs(double)
      67             : 
      68             : #ifndef __CORRECT_ISO_CPP_MATH_H_PROTO
      69             :   inline _GLIBCXX_CONSTEXPR double
      70             :   abs(double __x)
      71        2295 :   { return __builtin_fabs(__x); }
      72             : 
      73             :   inline _GLIBCXX_CONSTEXPR float
      74             :   abs(float __x)
      75        4455 :   { return __builtin_fabsf(__x); }
      76             : 
      77             :   inline _GLIBCXX_CONSTEXPR long double
      78             :   abs(long double __x)
      79             :   { return __builtin_fabsl(__x); }
      80             : #endif
      81             : 
      82             : #if defined(__GLIBCXX_TYPE_INT_N_0)
      83             :   inline _GLIBCXX_CONSTEXPR __GLIBCXX_TYPE_INT_N_0
      84             :   abs(__GLIBCXX_TYPE_INT_N_0 __x) { return __x >= 0 ? __x : -__x; }
      85             : #endif
      86             : #if defined(__GLIBCXX_TYPE_INT_N_1)
      87             :   inline _GLIBCXX_CONSTEXPR __GLIBCXX_TYPE_INT_N_1
      88             :   abs(__GLIBCXX_TYPE_INT_N_1 __x) { return __x >= 0 ? __x : -__x; }
      89             : #endif
      90             : #if defined(__GLIBCXX_TYPE_INT_N_2)
      91             :   inline _GLIBCXX_CONSTEXPR __GLIBCXX_TYPE_INT_N_2
      92             :   abs(__GLIBCXX_TYPE_INT_N_2 __x) { return __x >= 0 ? __x : -__x; }
      93             : #endif
      94             : #if defined(__GLIBCXX_TYPE_INT_N_3)
      95             :   inline _GLIBCXX_CONSTEXPR __GLIBCXX_TYPE_INT_N_3
      96             :   abs(__GLIBCXX_TYPE_INT_N_3 __x) { return __x >= 0 ? __x : -__x; }
      97             : #endif
      98             : 
      99             : #if !defined(__STRICT_ANSI__) && defined(_GLIBCXX_USE_FLOAT128) && !defined(__CUDACC__)
     100             :   inline _GLIBCXX_CONSTEXPR
     101             :   __float128
     102             :   abs(__float128 __x)
     103             :   { return __x < 0 ? -__x : __x; }
     104             : #endif
     105             : 
     106             : _GLIBCXX_END_NAMESPACE_VERSION
     107             : } // namespace
     108             : }
     109             : 
     110             : #endif // _GLIBCXX_BITS_STD_ABS_H