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121 lines
3.8 KiB
C++
121 lines
3.8 KiB
C++
// Integer comparison functions -*- C++ -*-
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// Copyright (C) 2020-2026 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 bits/intcmp.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{utility}
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*/
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#ifndef _GLIBCXX_INTCMP_H
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#define _GLIBCXX_INTCMP_H 1
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#ifdef _GLIBCXX_SYSHDR
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#pragma GCC system_header
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#endif
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#include <bits/version.h>
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#ifdef __glibcxx_integer_comparison_functions // C++ >= 20
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#include <type_traits>
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#include <ext/numeric_traits.h> // __int_traits
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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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template<typename _Tp, typename _Up>
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constexpr bool
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cmp_equal(_Tp __t, _Up __u) noexcept
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{
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static_assert(__is_signed_or_unsigned_integer<_Tp>::value);
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static_assert(__is_signed_or_unsigned_integer<_Up>::value);
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if constexpr (is_signed_v<_Tp> == is_signed_v<_Up>)
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return __t == __u;
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else if constexpr (is_signed_v<_Tp>)
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return __t >= 0 && make_unsigned_t<_Tp>(__t) == __u;
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else
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return __u >= 0 && __t == make_unsigned_t<_Up>(__u);
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}
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template<typename _Tp, typename _Up>
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constexpr bool
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cmp_not_equal(_Tp __t, _Up __u) noexcept
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{ return !std::cmp_equal(__t, __u); }
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template<typename _Tp, typename _Up>
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constexpr bool
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cmp_less(_Tp __t, _Up __u) noexcept
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{
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static_assert(__is_signed_or_unsigned_integer<_Tp>::value);
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static_assert(__is_signed_or_unsigned_integer<_Up>::value);
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if constexpr (is_signed_v<_Tp> == is_signed_v<_Up>)
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return __t < __u;
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else if constexpr (is_signed_v<_Tp>)
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return __t < 0 || make_unsigned_t<_Tp>(__t) < __u;
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else
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return __u >= 0 && __t < make_unsigned_t<_Up>(__u);
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}
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template<typename _Tp, typename _Up>
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constexpr bool
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cmp_greater(_Tp __t, _Up __u) noexcept
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{ return std::cmp_less(__u, __t); }
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template<typename _Tp, typename _Up>
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constexpr bool
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cmp_less_equal(_Tp __t, _Up __u) noexcept
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{ return !std::cmp_less(__u, __t); }
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template<typename _Tp, typename _Up>
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constexpr bool
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cmp_greater_equal(_Tp __t, _Up __u) noexcept
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{ return !std::cmp_less(__t, __u); }
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template<typename _Res, typename _Tp>
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constexpr bool
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in_range(_Tp __t) noexcept
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{
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static_assert(__is_signed_or_unsigned_integer<_Res>::value);
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static_assert(__is_signed_or_unsigned_integer<_Tp>::value);
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using __gnu_cxx::__int_traits;
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if constexpr (is_signed_v<_Tp> == is_signed_v<_Res>)
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return __int_traits<_Res>::__min <= __t
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&& __t <= __int_traits<_Res>::__max;
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else if constexpr (is_signed_v<_Tp>)
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return __t >= 0
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&& make_unsigned_t<_Tp>(__t) <= __int_traits<_Res>::__max;
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else
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return __t <= make_unsigned_t<_Res>(__int_traits<_Res>::__max);
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}
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_GLIBCXX_END_NAMESPACE_VERSION
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} // namespace
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#endif // __glibcxx_integer_comparison_functions
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#endif // _GLIBCXX_INTCMP_H
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