101 lines
3.6 KiB
C++
101 lines
3.6 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP___ALGORITHM_SET_INTERSECTION_H
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#define _LIBCPP___ALGORITHM_SET_INTERSECTION_H
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#include <__algorithm/comp.h>
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#include <__algorithm/comp_ref_type.h>
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#include <__algorithm/iterator_operations.h>
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#include <__config>
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#include <__iterator/iterator_traits.h>
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#include <__iterator/next.h>
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#include <__utility/move.h>
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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# pragma GCC system_header
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#endif
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_LIBCPP_BEGIN_NAMESPACE_STD
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template <class _InIter1, class _InIter2, class _OutIter>
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struct __set_intersection_result {
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_InIter1 __in1_;
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_InIter2 __in2_;
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_OutIter __out_;
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// need a constructor as C++03 aggregate init is hard
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_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_AFTER_CXX17
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__set_intersection_result(_InIter1&& __in_iter1, _InIter2&& __in_iter2, _OutIter&& __out_iter)
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: __in1_(std::move(__in_iter1)), __in2_(std::move(__in_iter2)), __out_(std::move(__out_iter)) {}
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};
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template <class _AlgPolicy, class _Compare, class _InIter1, class _Sent1, class _InIter2, class _Sent2, class _OutIter>
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_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_AFTER_CXX17 __set_intersection_result<_InIter1, _InIter2, _OutIter>
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__set_intersection(
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_InIter1 __first1, _Sent1 __last1, _InIter2 __first2, _Sent2 __last2, _OutIter __result, _Compare&& __comp) {
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while (__first1 != __last1 && __first2 != __last2) {
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if (__comp(*__first1, *__first2))
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++__first1;
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else {
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if (!__comp(*__first2, *__first1)) {
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*__result = *__first1;
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++__result;
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++__first1;
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}
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++__first2;
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}
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}
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return __set_intersection_result<_InIter1, _InIter2, _OutIter>(
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_IterOps<_AlgPolicy>::next(std::move(__first1), std::move(__last1)),
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_IterOps<_AlgPolicy>::next(std::move(__first2), std::move(__last2)),
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std::move(__result));
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}
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template <class _InputIterator1, class _InputIterator2, class _OutputIterator, class _Compare>
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inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_AFTER_CXX17 _OutputIterator set_intersection(
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_InputIterator1 __first1,
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_InputIterator1 __last1,
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_InputIterator2 __first2,
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_InputIterator2 __last2,
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_OutputIterator __result,
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_Compare __comp) {
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typedef typename __comp_ref_type<_Compare>::type _Comp_ref;
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return std::__set_intersection<_ClassicAlgPolicy, _Comp_ref>(
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std::move(__first1),
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std::move(__last1),
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std::move(__first2),
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std::move(__last2),
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std::move(__result),
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__comp)
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.__out_;
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}
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template <class _InputIterator1, class _InputIterator2, class _OutputIterator>
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inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_AFTER_CXX17 _OutputIterator set_intersection(
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_InputIterator1 __first1,
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_InputIterator1 __last1,
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_InputIterator2 __first2,
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_InputIterator2 __last2,
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_OutputIterator __result) {
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return std::__set_intersection<_ClassicAlgPolicy>(
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std::move(__first1),
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std::move(__last1),
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std::move(__first2),
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std::move(__last2),
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std::move(__result),
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__less<typename iterator_traits<_InputIterator1>::value_type,
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typename iterator_traits<_InputIterator2>::value_type>())
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.__out_;
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}
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___ALGORITHM_SET_INTERSECTION_H
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