v1/__algorithm/ranges_lexicographical_compare.h

0001 //===----------------------------------------------------------------------===//
0002 //
0003 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
0004 // See https://llvm.org/LICENSE.txt for license information.
0005 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
0006 //
0007 //===----------------------------------------------------------------------===//
0008
0009 #ifndef _LIBCPP___ALGORITHM_RANGES_LEXICOGRAPHICAL_COMPARE_H
0010 #define _LIBCPP___ALGORITHM_RANGES_LEXICOGRAPHICAL_COMPARE_H
0011
0012 #include <__algorithm/lexicographical_compare.h>
0013 #include <__algorithm/unwrap_range.h>
0014 #include <__config>
0015 #include <__functional/identity.h>
0016 #include <__functional/invoke.h>
0017 #include <__functional/ranges_operations.h>
0018 #include <__iterator/concepts.h>
0019 #include <__iterator/projected.h>
0020 #include <__ranges/access.h>
0021 #include <__ranges/concepts.h>
0022 #include <__utility/move.h>
0023
0024 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
0025 #  pragma GCC system_header
0026 #endif
0027
0028 _LIBCPP_PUSH_MACROS
0029 #include <__undef_macros>
0030
0031 #if _LIBCPP_STD_VER >= 20
0032
0033 _LIBCPP_BEGIN_NAMESPACE_STD
0034
0035 namespace ranges {
0036 struct __lexicographical_compare {
0037   template <class _Iter1, class _Sent1, class _Iter2, class _Sent2, class _Proj1, class _Proj2, class _Comp>
0038   static _LIBCPP_HIDE_FROM_ABI constexpr bool __lexicographical_compare_unwrap(
0039       _Iter1 __first1,
0040       _Sent1 __last1,
0041       _Iter2 __first2,
0042       _Sent2 __last2,
0043       _Comp& __comp,
0044       _Proj1& __proj1,
0045       _Proj2& __proj2) {
0046     auto [__first1_un, __last1_un] = std::__unwrap_range(std::move(__first1), std::move(__last1));
0047     auto [__first2_un, __last2_un] = std::__unwrap_range(std::move(__first2), std::move(__last2));
0048     return std::__lexicographical_compare(
0049         std::move(__first1_un),
0050         std::move(__last1_un),
0051         std::move(__first2_un),
0052         std::move(__last2_un),
0053         __comp,
0054         __proj1,
0055         __proj2);
0056   }
0057
0058   template <input_iterator _Iter1,
0059             sentinel_for<_Iter1> _Sent1,
0060             input_iterator _Iter2,
0061             sentinel_for<_Iter2> _Sent2,
0062             class _Proj1                                                                           = identity,
0063             class _Proj2                                                                           = identity,
0064             indirect_strict_weak_order<projected<_Iter1, _Proj1>, projected<_Iter2, _Proj2>> _Comp = ranges::less>
0065   [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr bool operator()(
0066       _Iter1 __first1,
0067       _Sent1 __last1,
0068       _Iter2 __first2,
0069       _Sent2 __last2,
0070       _Comp __comp   = {},
0071       _Proj1 __proj1 = {},
0072       _Proj2 __proj2 = {}) const {
0073     return __lexicographical_compare_unwrap(
0074         std::move(__first1), std::move(__last1), std::move(__first2), std::move(__last2), __comp, __proj1, __proj2);
0075   }
0076
0077   template <input_range _Range1,
0078             input_range _Range2,
0079             class _Proj1 = identity,
0080             class _Proj2 = identity,
0081             indirect_strict_weak_order<projected<iterator_t<_Range1>, _Proj1>, projected<iterator_t<_Range2>, _Proj2>>
0082                 _Comp = ranges::less>
0083   [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr bool operator()(
0084       _Range1&& __range1, _Range2&& __range2, _Comp __comp = {}, _Proj1 __proj1 = {}, _Proj2 __proj2 = {}) const {
0085     return __lexicographical_compare_unwrap(
0086         ranges::begin(__range1),
0087         ranges::end(__range1),
0088         ranges::begin(__range2),
0089         ranges::end(__range2),
0090         __comp,
0091         __proj1,
0092         __proj2);
0093   }
0094 };
0095
0096 inline namespace __cpo {
0097 inline constexpr auto lexicographical_compare = __lexicographical_compare{};
0098 } // namespace __cpo
0099 } // namespace ranges
0100
0101 _LIBCPP_END_NAMESPACE_STD
0102
0103 #endif // _LIBCPP_STD_VER >= 20
0104
0105 _LIBCPP_POP_MACROS
0106
0107 #endif // _LIBCPP___ALGORITHM_RANGES_LEXICOGRAPHICAL_COMPARE_H