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Diffstat (limited to 'libcxx/include/__utility/cmp.h')
-rw-r--r-- | libcxx/include/__utility/cmp.h | 107 |
1 files changed, 107 insertions, 0 deletions
diff --git a/libcxx/include/__utility/cmp.h b/libcxx/include/__utility/cmp.h new file mode 100644 index 000000000000..a14e373c3f4b --- /dev/null +++ b/libcxx/include/__utility/cmp.h @@ -0,0 +1,107 @@ +//===----------------------------------------------------------------------===// +// +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. +// See https://llvm.org/LICENSE.txt for license information. +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception +// +//===----------------------------------------------------------------------===// + +#ifndef _LIBCPP___UTILITY_CMP_H +#define _LIBCPP___UTILITY_CMP_H + +#include <__config> +#include <__utility/forward.h> +#include <__utility/move.h> +#include <limits> +#include <type_traits> + +#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) +#pragma GCC system_header +#endif + +_LIBCPP_PUSH_MACROS +#include <__undef_macros> + +_LIBCPP_BEGIN_NAMESPACE_STD + +#if _LIBCPP_STD_VER > 17 && !defined(_LIBCPP_HAS_NO_CONCEPTS) +template<class _Tp, class... _Up> +struct _IsSameAsAny : _Or<_IsSame<_Tp, _Up>...> {}; + +template<class _Tp> +concept __is_safe_integral_cmp = is_integral_v<_Tp> && + !_IsSameAsAny<_Tp, bool, char, +#ifndef _LIBCPP_HAS_NO_CHAR8_T + char8_t, +#endif +#ifndef _LIBCPP_HAS_NO_UNICODE_CHARS + char16_t, char32_t, +#endif + wchar_t>::value; + +template<__is_safe_integral_cmp _Tp, __is_safe_integral_cmp _Up> +_LIBCPP_INLINE_VISIBILITY constexpr +bool cmp_equal(_Tp __t, _Up __u) noexcept +{ + if constexpr (is_signed_v<_Tp> == is_signed_v<_Up>) + return __t == __u; + else if constexpr (is_signed_v<_Tp>) + return __t < 0 ? false : make_unsigned_t<_Tp>(__t) == __u; + else + return __u < 0 ? false : __t == make_unsigned_t<_Up>(__u); +} + +template<__is_safe_integral_cmp _Tp, __is_safe_integral_cmp _Up> +_LIBCPP_INLINE_VISIBILITY constexpr +bool cmp_not_equal(_Tp __t, _Up __u) noexcept +{ + return !_VSTD::cmp_equal(__t, __u); +} + +template<__is_safe_integral_cmp _Tp, __is_safe_integral_cmp _Up> +_LIBCPP_INLINE_VISIBILITY constexpr +bool cmp_less(_Tp __t, _Up __u) noexcept +{ + if constexpr (is_signed_v<_Tp> == is_signed_v<_Up>) + return __t < __u; + else if constexpr (is_signed_v<_Tp>) + return __t < 0 ? true : make_unsigned_t<_Tp>(__t) < __u; + else + return __u < 0 ? false : __t < make_unsigned_t<_Up>(__u); +} + +template<__is_safe_integral_cmp _Tp, __is_safe_integral_cmp _Up> +_LIBCPP_INLINE_VISIBILITY constexpr +bool cmp_greater(_Tp __t, _Up __u) noexcept +{ + return _VSTD::cmp_less(__u, __t); +} + +template<__is_safe_integral_cmp _Tp, __is_safe_integral_cmp _Up> +_LIBCPP_INLINE_VISIBILITY constexpr +bool cmp_less_equal(_Tp __t, _Up __u) noexcept +{ + return !_VSTD::cmp_greater(__t, __u); +} + +template<__is_safe_integral_cmp _Tp, __is_safe_integral_cmp _Up> +_LIBCPP_INLINE_VISIBILITY constexpr +bool cmp_greater_equal(_Tp __t, _Up __u) noexcept +{ + return !_VSTD::cmp_less(__t, __u); +} + +template<__is_safe_integral_cmp _Tp, __is_safe_integral_cmp _Up> +_LIBCPP_INLINE_VISIBILITY constexpr +bool in_range(_Up __u) noexcept +{ + return _VSTD::cmp_less_equal(__u, numeric_limits<_Tp>::max()) && + _VSTD::cmp_greater_equal(__u, numeric_limits<_Tp>::min()); +} +#endif + +_LIBCPP_END_NAMESPACE_STD + +_LIBCPP_POP_MACROS + +#endif // _LIBCPP___UTILITY_CMP_H |