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Diffstat (limited to 'libstdc++-v3/include/bits/intcmp.h')
| -rw-r--r-- | libstdc++-v3/include/bits/intcmp.h | 120 |
1 files changed, 120 insertions, 0 deletions
diff --git a/libstdc++-v3/include/bits/intcmp.h b/libstdc++-v3/include/bits/intcmp.h new file mode 100644 index 0000000..bb9c7f2 --- /dev/null +++ b/libstdc++-v3/include/bits/intcmp.h @@ -0,0 +1,120 @@ +// Integer comparison functions -*- C++ -*- + +// Copyright (C) 2020-2025 Free Software Foundation, Inc. +// +// This file is part of the GNU ISO C++ Library. This library is free +// software; you can redistribute it and/or modify it under the +// terms of the GNU General Public License as published by the +// Free Software Foundation; either version 3, or (at your option) +// any later version. + +// This library is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU General Public License for more details. + +// Under Section 7 of GPL version 3, you are granted additional +// permissions described in the GCC Runtime Library Exception, version +// 3.1, as published by the Free Software Foundation. + +// You should have received a copy of the GNU General Public License and +// a copy of the GCC Runtime Library Exception along with this program; +// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see +// <http://www.gnu.org/licenses/>. + +/** @file bits/intcmp.h + * This is an internal header file, included by other library headers. + * Do not attempt to use it directly. @headername{utility} + */ + +#ifndef _GLIBCXX_INTCMP_H +#define _GLIBCXX_INTCMP_H 1 + +#ifdef _GLIBCXX_SYSHDR +#pragma GCC system_header +#endif + +#include <bits/version.h> + +#ifdef __glibcxx_integer_comparison_functions // C++ >= 20 + +#include <type_traits> +#include <ext/numeric_traits.h> // __int_traits + +namespace std _GLIBCXX_VISIBILITY(default) +{ +_GLIBCXX_BEGIN_NAMESPACE_VERSION + + template<typename _Tp, typename _Up> + constexpr bool + cmp_equal(_Tp __t, _Up __u) noexcept + { + static_assert(__is_signed_or_unsigned_integer<_Tp>::value); + static_assert(__is_signed_or_unsigned_integer<_Up>::value); + + if constexpr (is_signed_v<_Tp> == is_signed_v<_Up>) + return __t == __u; + else if constexpr (is_signed_v<_Tp>) + return __t >= 0 && make_unsigned_t<_Tp>(__t) == __u; + else + return __u >= 0 && __t == make_unsigned_t<_Up>(__u); + } + + template<typename _Tp, typename _Up> + constexpr bool + cmp_not_equal(_Tp __t, _Up __u) noexcept + { return !std::cmp_equal(__t, __u); } + + template<typename _Tp, typename _Up> + constexpr bool + cmp_less(_Tp __t, _Up __u) noexcept + { + static_assert(__is_signed_or_unsigned_integer<_Tp>::value); + static_assert(__is_signed_or_unsigned_integer<_Up>::value); + + if constexpr (is_signed_v<_Tp> == is_signed_v<_Up>) + return __t < __u; + else if constexpr (is_signed_v<_Tp>) + return __t < 0 || make_unsigned_t<_Tp>(__t) < __u; + else + return __u >= 0 && __t < make_unsigned_t<_Up>(__u); + } + + template<typename _Tp, typename _Up> + constexpr bool + cmp_greater(_Tp __t, _Up __u) noexcept + { return std::cmp_less(__u, __t); } + + template<typename _Tp, typename _Up> + constexpr bool + cmp_less_equal(_Tp __t, _Up __u) noexcept + { return !std::cmp_less(__u, __t); } + + template<typename _Tp, typename _Up> + constexpr bool + cmp_greater_equal(_Tp __t, _Up __u) noexcept + { return !std::cmp_less(__t, __u); } + + template<typename _Res, typename _Tp> + constexpr bool + in_range(_Tp __t) noexcept + { + static_assert(__is_signed_or_unsigned_integer<_Res>::value); + static_assert(__is_signed_or_unsigned_integer<_Tp>::value); + using __gnu_cxx::__int_traits; + + if constexpr (is_signed_v<_Tp> == is_signed_v<_Res>) + return __int_traits<_Res>::__min <= __t + && __t <= __int_traits<_Res>::__max; + else if constexpr (is_signed_v<_Tp>) + return __t >= 0 + && make_unsigned_t<_Tp>(__t) <= __int_traits<_Res>::__max; + else + return __t <= make_unsigned_t<_Res>(__int_traits<_Res>::__max); + } + +_GLIBCXX_END_NAMESPACE_VERSION +} // namespace + +#endif // __glibcxx_integer_comparison_functions +#endif // _GLIBCXX_INTCMP_H |