libcxx/include/__cxx03/__algorithm/ranges_mismatch.h

   1 //===----------------------------------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #ifndef _LIBCPP___ALGORITHM_RANGES_MISMATCH_H
  10 #define _LIBCPP___ALGORITHM_RANGES_MISMATCH_H
  11
  12 #include <__cxx03/__algorithm/in_in_result.h>
  13 #include <__cxx03/__algorithm/mismatch.h>
  14 #include <__cxx03/__algorithm/unwrap_range.h>
  15 #include <__cxx03/__config>
  16 #include <__cxx03/__functional/identity.h>
  17 #include <__cxx03/__functional/invoke.h>
  18 #include <__cxx03/__functional/ranges_operations.h>
  19 #include <__cxx03/__iterator/concepts.h>
  20 #include <__cxx03/__iterator/indirectly_comparable.h>
  21 #include <__cxx03/__ranges/access.h>
  22 #include <__cxx03/__ranges/concepts.h>
  23 #include <__cxx03/__ranges/dangling.h>
  24 #include <__cxx03/__utility/move.h>
  25
  26 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
  27 #  pragma GCC system_header
  28 #endif
  29
  30 _LIBCPP_PUSH_MACROS
  31 #include <__cxx03/__undef_macros>
  32
  33 _LIBCPP_BEGIN_NAMESPACE_STD
  34
  35 #if _LIBCPP_STD_VER >= 20
  36
  37 namespace ranges {
  38
  39 template <class _I1, class _I2>
  40 using mismatch_result = in_in_result<_I1, _I2>;
  41
  42 namespace __mismatch {
  43 struct __fn {
  44   template <class _I1, class _S1, class _I2, class _S2, class _Pred, class _Proj1, class _Proj2>
  45   static _LIBCPP_HIDE_FROM_ABI constexpr mismatch_result<_I1, _I2>
  46   __go(_I1 __first1, _S1 __last1, _I2 __first2, _S2 __last2, _Pred& __pred, _Proj1& __proj1, _Proj2& __proj2) {
  47     if constexpr (forward_iterator<_I1> && forward_iterator<_I2>) {
  48       auto __range1 = std::__unwrap_range(__first1, __last1);
  49       auto __range2 = std::__unwrap_range(__first2, __last2);
  50       auto __res =
  51           std::__mismatch(__range1.first, __range1.second, __range2.first, __range2.second, __pred, __proj1, __proj2);
  52       return {std::__rewrap_range<_S1>(__first1, __res.first), std::__rewrap_range<_S2>(__first2, __res.second)};
  53     } else {
  54       auto __res = std::__mismatch(
  55           std::move(__first1), std::move(__last1), std::move(__first2), std::move(__last2), __pred, __proj1, __proj2);
  56       return {std::move(__res.first), std::move(__res.second)};
  57     }
  58   }
  59
  60   template <input_iterator _I1,
  61             sentinel_for<_I1> _S1,
  62             input_iterator _I2,
  63             sentinel_for<_I2> _S2,
  64             class _Pred  = ranges::equal_to,
  65             class _Proj1 = identity,
  66             class _Proj2 = identity>
  67     requires indirectly_comparable<_I1, _I2, _Pred, _Proj1, _Proj2>
  68   [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr mismatch_result<_I1, _I2> operator()(
  69       _I1 __first1, _S1 __last1, _I2 __first2, _S2 __last2, _Pred __pred = {}, _Proj1 __proj1 = {}, _Proj2 __proj2 = {})
  70       const {
  71     return __go(std::move(__first1), __last1, std::move(__first2), __last2, __pred, __proj1, __proj2);
  72   }
  73
  74   template <input_range _R1,
  75             input_range _R2,
  76             class _Pred  = ranges::equal_to,
  77             class _Proj1 = identity,
  78             class _Proj2 = identity>
  79     requires indirectly_comparable<iterator_t<_R1>, iterator_t<_R2>, _Pred, _Proj1, _Proj2>
  80   [[nodiscard]]
  81   _LIBCPP_HIDE_FROM_ABI constexpr mismatch_result<borrowed_iterator_t<_R1>, borrowed_iterator_t<_R2>>
  82   operator()(_R1&& __r1, _R2&& __r2, _Pred __pred = {}, _Proj1 __proj1 = {}, _Proj2 __proj2 = {}) const {
  83     return __go(
  84         ranges::begin(__r1), ranges::end(__r1), ranges::begin(__r2), ranges::end(__r2), __pred, __proj1, __proj2);
  85   }
  86 };
  87 } // namespace __mismatch
  88
  89 inline namespace __cpo {
  90 constexpr inline auto mismatch = __mismatch::__fn{};
  91 } // namespace __cpo
  92 } // namespace ranges
  93
  94 #endif // _LIBCPP_STD_VER >= 20
  95
  96 _LIBCPP_END_NAMESPACE_STD
  97
  98 _LIBCPP_POP_MACROS
  99
 100 #endif // _LIBCPP___ALGORITHM_RANGES_MISMATCH_H