1 //===----------------------------------------------------------------------===//
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
7 //===----------------------------------------------------------------------===//
9 #ifndef _LIBCPP___ALGORITHM_SET_DIFFERENCE_H
10 #define _LIBCPP___ALGORITHM_SET_DIFFERENCE_H
12 #include <__algorithm/comp.h>
13 #include <__algorithm/comp_ref_type.h>
14 #include <__algorithm/copy.h>
16 #include <__functional/identity.h>
17 #include <__functional/invoke.h>
18 #include <__iterator/iterator_traits.h>
19 #include <__utility/move.h>
20 #include <__utility/pair.h>
21 #include <type_traits>
23 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
24 # pragma GCC system_header
27 _LIBCPP_BEGIN_NAMESPACE_STD
29 template < class _Comp, class _InIter1, class _Sent1, class _InIter2, class _Sent2, class _OutIter>
30 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_AFTER_CXX17 pair<__uncvref_t<_InIter1>, __uncvref_t<_OutIter> >
32 _InIter1&& __first1, _Sent1&& __last1, _InIter2&& __first2, _Sent2&& __last2, _OutIter&& __result, _Comp&& __comp) {
33 while (__first1 != __last1 && __first2 != __last2) {
34 if (__comp(*__first1, *__first2)) {
35 *__result = *__first1;
38 } else if (__comp(*__first2, *__first1)) {
45 return std::__copy(std::move(__first1), std::move(__last1), std::move(__result));
48 template <class _InputIterator1, class _InputIterator2, class _OutputIterator, class _Compare>
49 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_AFTER_CXX17 _OutputIterator set_difference(
50 _InputIterator1 __first1,
51 _InputIterator1 __last1,
52 _InputIterator2 __first2,
53 _InputIterator2 __last2,
54 _OutputIterator __result,
56 typedef typename __comp_ref_type<_Compare>::type _Comp_ref;
57 return std::__set_difference<_Comp_ref>(__first1, __last1, __first2, __last2, __result, __comp).second;
60 template <class _InputIterator1, class _InputIterator2, class _OutputIterator>
61 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_AFTER_CXX17 _OutputIterator set_difference(
62 _InputIterator1 __first1,
63 _InputIterator1 __last1,
64 _InputIterator2 __first2,
65 _InputIterator2 __last2,
66 _OutputIterator __result) {
67 return std::__set_difference(
73 __less<typename iterator_traits<_InputIterator1>::value_type,
74 typename iterator_traits<_InputIterator2>::value_type>()).second;
77 _LIBCPP_END_NAMESPACE_STD
79 #endif // _LIBCPP___ALGORITHM_SET_DIFFERENCE_H