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 <__functional/invoke.h>
  17 #include <__iterator/iterator_traits.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_BEGIN_NAMESPACE_STD
  26
  27 template <class _Iter1, class _Sent1, class _Iter2, class _Sent2, class _Comp, class _Proj1, class _Proj2>
  28 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 bool
  29 __includes(_Iter1 __first1, _Sent1 __last1, _Iter2 __first2, _Sent2 __last2,
  30            _Comp&& __comp, _Proj1&& __proj1, _Proj2&& __proj2) {
  31   for (; __first2 != __last2; ++__first1) {
  32     if (__first1 == __last1 || std::__invoke(
  33           __comp, std::__invoke(__proj2, *__first2), std::__invoke(__proj1, *__first1)))
  34       return false;
  35     if (!std::__invoke(__comp, std::__invoke(__proj1, *__first1), std::__invoke(__proj2, *__first2)))
  36       ++__first2;
  37   }
  38   return true;
  39 }
  40
  41 template <class _InputIterator1, class _InputIterator2, class _Compare>
  42 _LIBCPP_NODISCARD_EXT inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 bool includes(
  43     _InputIterator1 __first1,
  44     _InputIterator1 __last1,
  45     _InputIterator2 __first2,
  46     _InputIterator2 __last2,
  47     _Compare __comp) {
  48   static_assert(__is_callable<_Compare, decltype(*__first1), decltype(*__first2)>::value,
  49       "Comparator has to be callable");
  50
  51   return std::__includes(
  52       std::move(__first1),
  53       std::move(__last1),
  54       std::move(__first2),
  55       std::move(__last2),
  56       static_cast<__comp_ref_type<_Compare> >(__comp),
  57       __identity(),
  58       __identity());
  59 }
  60
  61 template <class _InputIterator1, class _InputIterator2>
  62 _LIBCPP_NODISCARD_EXT inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 bool
  63 includes(_InputIterator1 __first1, _InputIterator1 __last1, _InputIterator2 __first2, _InputIterator2 __last2) {
  64   return std::includes(std::move(__first1), std::move(__last1), std::move(__first2), std::move(__last2), __less<>());
  65 }
  66
  67 _LIBCPP_END_NAMESPACE_STD
  68
  69 #endif // _LIBCPP___ALGORITHM_INCLUDES_H