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8936f5310a
This DR was already resolved for GCC 7.1 by the implementation of DR 2192, but we didn't have an explicit test for the behaviour that 2735 guarantees. * doc/xml/manual/intro.xml: Document LWG 2735 status. * include/bits/std_abs.h: Add comment about LWG 2735. * testsuite/26_numerics/headers/cstdlib/dr2735.cc: New test. From-SVN: r268867
112 lines
3.3 KiB
C++
112 lines
3.3 KiB
C++
// -*- C++ -*- C library enhancements header.
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// Copyright (C) 2016-2019 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 3, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// Under Section 7 of GPL version 3, you are granted additional
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// permissions described in the GCC Runtime Library Exception, version
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// 3.1, as published by the Free Software Foundation.
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// You should have received a copy of the GNU General Public License and
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// a copy of the GCC Runtime Library Exception along with this program;
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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// <http://www.gnu.org/licenses/>.
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/** @file include/bits/std_abs.h
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* This is an internal header file, included by other library headers.
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* Do not attempt to use it directly. @headername{cmath, cstdlib}
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*/
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#ifndef _GLIBCXX_BITS_STD_ABS_H
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#define _GLIBCXX_BITS_STD_ABS_H
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#pragma GCC system_header
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#include <bits/c++config.h>
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#define _GLIBCXX_INCLUDE_NEXT_C_HEADERS
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#include_next <stdlib.h>
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#ifdef __CORRECT_ISO_CPP_MATH_H_PROTO
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# include_next <math.h>
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#endif
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#undef _GLIBCXX_INCLUDE_NEXT_C_HEADERS
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#undef abs
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extern "C++"
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{
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namespace std _GLIBCXX_VISIBILITY(default)
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{
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_GLIBCXX_BEGIN_NAMESPACE_VERSION
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using ::abs;
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#ifndef __CORRECT_ISO_CPP_STDLIB_H_PROTO
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inline long
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abs(long __i) { return __builtin_labs(__i); }
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#endif
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#ifdef _GLIBCXX_USE_LONG_LONG
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inline long long
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abs(long long __x) { return __builtin_llabs (__x); }
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#endif
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// _GLIBCXX_RESOLVE_LIB_DEFECTS
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// 2192. Validity and return type of std::abs(0u) is unclear
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// 2294. <cstdlib> should declare abs(double)
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// 2735. std::abs(short), std::abs(signed char) and others should return int
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#ifndef __CORRECT_ISO_CPP_MATH_H_PROTO
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inline _GLIBCXX_CONSTEXPR double
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abs(double __x)
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{ return __builtin_fabs(__x); }
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inline _GLIBCXX_CONSTEXPR float
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abs(float __x)
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{ return __builtin_fabsf(__x); }
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inline _GLIBCXX_CONSTEXPR long double
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abs(long double __x)
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{ return __builtin_fabsl(__x); }
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#endif
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#if defined(__GLIBCXX_TYPE_INT_N_0)
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inline _GLIBCXX_CONSTEXPR __GLIBCXX_TYPE_INT_N_0
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abs(__GLIBCXX_TYPE_INT_N_0 __x) { return __x >= 0 ? __x : -__x; }
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#endif
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#if defined(__GLIBCXX_TYPE_INT_N_1)
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inline _GLIBCXX_CONSTEXPR __GLIBCXX_TYPE_INT_N_1
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abs(__GLIBCXX_TYPE_INT_N_1 __x) { return __x >= 0 ? __x : -__x; }
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#endif
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#if defined(__GLIBCXX_TYPE_INT_N_2)
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inline _GLIBCXX_CONSTEXPR __GLIBCXX_TYPE_INT_N_2
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abs(__GLIBCXX_TYPE_INT_N_2 __x) { return __x >= 0 ? __x : -__x; }
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#endif
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#if defined(__GLIBCXX_TYPE_INT_N_3)
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inline _GLIBCXX_CONSTEXPR __GLIBCXX_TYPE_INT_N_3
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abs(__GLIBCXX_TYPE_INT_N_3 __x) { return __x >= 0 ? __x : -__x; }
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#endif
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#if !defined(__STRICT_ANSI__) && defined(_GLIBCXX_USE_FLOAT128)
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inline _GLIBCXX_CONSTEXPR
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__float128
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abs(__float128 __x)
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{ return __x < 0 ? -__x : __x; }
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#endif
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_GLIBCXX_END_NAMESPACE_VERSION
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} // namespace
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} // extern "C"++"
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#endif // _GLIBCXX_BITS_STD_ABS_H
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