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This implements LWG4550: Need new feature test macros for <stdckdint.h> and <stdbit.h>. libstdc++-v3/ChangeLog: * include/bits/version.def (stdbit_h, stdckdint_h): Define. * include/bits/version.h: Regenerate. * include/c_compatibility/stdbit.h (__cpp_lib_stdbit_h): Define and use it in guards. * include/c_compatibility/stdckdint.h (__cpp_lib_stdckdint_h): Define and use it in guards. Reviewed-by: Jonathan Wakely <jwakely@redhat.com> Signed-off-by: Tomasz Kamiński <tkaminsk@redhat.com>
106 lines
3.6 KiB
C++
106 lines
3.6 KiB
C++
// C compatibility header <stdckdint.h> -*- C++ -*-
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// Copyright The GNU Toolchain Authors.
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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/stdckdint.h
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* This is a Standard C++ Library header.
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*/
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#ifndef _GLIBCXX_STDCKDINT_H
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#define _GLIBCXX_STDCKDINT_H
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#define __glibcxx_want_stdckdint_h
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#include <bits/version.h>
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#ifdef __cpp_lib_stdckdint_h // C++ >= 26
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#include <type_traits>
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#include <concepts>
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#define __STDC_VERSION_STDCKDINT_H__ 202311L
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#ifndef _GLIBCXX_DOXYGEN
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// We define these in our own namespace, but let Doxygen think otherwise.
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namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
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{
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#endif
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/** Checked integer arithmetic
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*
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* Performs arithmetic on `__a` and `__b` and stores the result in `*__result`,
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* with overflow detection.
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* The arithmetic is performed in infinite signed precision, without overflow,
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* then converted to the result type, `_Tp1`. If the converted result is not
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* equal to the infinite precision result, the stored result is wrapped to the
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* width of `_Tp1` and `true` is returned. Otherwise, the stored result is
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* correct and `false` is returned.
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*
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* @param __result A pointer to a signed or unsigned integer type.
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* @param __a A signed or unsigned integer type.
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* @param __b A signed or unsigned integer type.
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* @return True if overflow occurred, false otherwise.
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* @since C++26
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* @{
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*/
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template<typename _Tp1, typename _Tp2, typename _Tp3>
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inline bool
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ckd_add(_Tp1* __result, _Tp2 __a, _Tp3 __b)
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{
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static_assert(std::__is_signed_or_unsigned_integer<_Tp1>::value);
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static_assert(std::__is_signed_or_unsigned_integer<_Tp2>::value);
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static_assert(std::__is_signed_or_unsigned_integer<_Tp3>::value);
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return __builtin_add_overflow(__a, __b, __result);
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}
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template<typename _Tp1, typename _Tp2, typename _Tp3>
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inline bool
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ckd_sub(_Tp1* __result, _Tp2 __a, _Tp3 __b)
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{
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static_assert(std::__is_signed_or_unsigned_integer<_Tp1>::value);
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static_assert(std::__is_signed_or_unsigned_integer<_Tp2>::value);
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static_assert(std::__is_signed_or_unsigned_integer<_Tp3>::value);
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return __builtin_sub_overflow(__a, __b, __result);
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}
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template<typename _Tp1, typename _Tp2, typename _Tp3>
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inline bool
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ckd_mul(_Tp1* __result, _Tp2 __a, _Tp3 __b)
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{
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static_assert(std::__is_signed_or_unsigned_integer<_Tp1>::value);
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static_assert(std::__is_signed_or_unsigned_integer<_Tp2>::value);
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static_assert(std::__is_signed_or_unsigned_integer<_Tp3>::value);
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return __builtin_mul_overflow(__a, __b, __result);
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}
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/// @}
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#ifndef _GLIBCXX_DOXYGEN
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} // namespace __gnu_cxx
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using __gnu_cxx::ckd_add;
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using __gnu_cxx::ckd_sub;
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using __gnu_cxx::ckd_mul;
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#endif
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#endif // __cpp_lib_stdckdint_h
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#endif // _GLIBCXX_STDCKDINT_H
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