libcxx/include/__algorithm/includes.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_INCLUDES_H
  10 #define _LIBCPP___ALGORITHM_INCLUDES_H
  11
  12 #include <__algorithm/comp.h>
  13 #include <__algorithm/comp_ref_type.h>
  14 #include <__config>
  15 #include <__functional/identity.h>
  16 #include <__iterator/iterator_traits.h>
  17 #include <__type_traits/invoke.h>
  18 #include <__type_traits/is_callable.h>
  19 #include <__utility/move.h>
  20
  21 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
  22 #  pragma GCC system_header
  23 #endif
  24
  25 _LIBCPP_PUSH_MACROS
  26 #include <__undef_macros>
  27
  28 _LIBCPP_BEGIN_NAMESPACE_STD
  29
  30 template <class _Iter1, class _Sent1, class _Iter2, class _Sent2, class _Comp, class _Proj1, class _Proj2>
  31 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 bool __includes(
  32     _Iter1 __first1,
  33     _Sent1 __last1,
  34     _Iter2 __first2,
  35     _Sent2 __last2,
  36     _Comp&& __comp,
  37     _Proj1&& __proj1,
  38     _Proj2&& __proj2) {
  39   for (; __first2 != __last2; ++__first1) {
  40     if (__first1 == __last1 ||
  41         std::__invoke(__comp, std::__invoke(__proj2, *__first2), std::__invoke(__proj1, *__first1)))
  42       return false;
  43     if (!std::__invoke(__comp, std::__invoke(__proj1, *__first1), std::__invoke(__proj2, *__first2)))
  44       ++__first2;
  45   }
  46   return true;
  47 }
  48
  49 template <class _InputIterator1, class _InputIterator2, class _Compare>
  50 [[__nodiscard__]] inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 bool
  51 includes(_InputIterator1 __first1,
  52          _InputIterator1 __last1,
  53          _InputIterator2 __first2,
  54          _InputIterator2 __last2,
  55          _Compare __comp) {
  56   static_assert(
  57       __is_callable<_Compare&, decltype(*__first1), decltype(*__first2)>::value, "The comparator has to be callable");
  58
  59   return std::__includes(
  60       std::move(__first1),
  61       std::move(__last1),
  62       std::move(__first2),
  63       std::move(__last2),
  64       static_cast<__comp_ref_type<_Compare> >(__comp),
  65       __identity(),
  66       __identity());
  67 }
  68
  69 template <class _InputIterator1, class _InputIterator2>
  70 [[__nodiscard__]] inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 bool
  71 includes(_InputIterator1 __first1, _InputIterator1 __last1, _InputIterator2 __first2, _InputIterator2 __last2) {
  72   return std::includes(std::move(__first1), std::move(__last1), std::move(__first2), std::move(__last2), __less<>());
  73 }
  74
  75 _LIBCPP_END_NAMESPACE_STD
  76
  77 _LIBCPP_POP_MACROS
  78
  79 #endif // _LIBCPP___ALGORITHM_INCLUDES_H