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_SET_INTERSECTION_H
10 #define _LIBCPP___ALGORITHM_SET_INTERSECTION_H
11
12 #include <__config>
13 #include <__algorithm/comp.h>
14 #include <__algorithm/comp_ref_type.h>
15 #include <__iterator/iterator_traits.h>
16
17 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
18 #pragma GCC system_header
19 #endif
20
21 _LIBCPP_PUSH_MACROS
22 #include <__undef_macros>
23
24 _LIBCPP_BEGIN_NAMESPACE_STD
25
26 template <class _Compare, class _InputIterator1, class _InputIterator2, class _OutputIterator>
27 _LIBCPP_CONSTEXPR_AFTER_CXX17 _OutputIterator
__set_intersection(_InputIterator1 __first1,_InputIterator1 __last1,_InputIterator2 __first2,_InputIterator2 __last2,_OutputIterator __result,_Compare __comp)28 __set_intersection(_InputIterator1 __first1, _InputIterator1 __last1,
29 _InputIterator2 __first2, _InputIterator2 __last2, _OutputIterator __result, _Compare __comp)
30 {
31 while (__first1 != __last1 && __first2 != __last2)
32 {
33 if (__comp(*__first1, *__first2))
34 ++__first1;
35 else
36 {
37 if (!__comp(*__first2, *__first1))
38 {
39 *__result = *__first1;
40 ++__result;
41 ++__first1;
42 }
43 ++__first2;
44 }
45 }
46 return __result;
47 }
48
49 template <class _InputIterator1, class _InputIterator2, class _OutputIterator, class _Compare>
50 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
51 _OutputIterator
set_intersection(_InputIterator1 __first1,_InputIterator1 __last1,_InputIterator2 __first2,_InputIterator2 __last2,_OutputIterator __result,_Compare __comp)52 set_intersection(_InputIterator1 __first1, _InputIterator1 __last1,
53 _InputIterator2 __first2, _InputIterator2 __last2, _OutputIterator __result, _Compare __comp)
54 {
55 typedef typename __comp_ref_type<_Compare>::type _Comp_ref;
56 return _VSTD::__set_intersection<_Comp_ref>(__first1, __last1, __first2, __last2, __result, __comp);
57 }
58
59 template <class _InputIterator1, class _InputIterator2, class _OutputIterator>
60 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
61 _OutputIterator
set_intersection(_InputIterator1 __first1,_InputIterator1 __last1,_InputIterator2 __first2,_InputIterator2 __last2,_OutputIterator __result)62 set_intersection(_InputIterator1 __first1, _InputIterator1 __last1,
63 _InputIterator2 __first2, _InputIterator2 __last2, _OutputIterator __result)
64 {
65 return _VSTD::set_intersection(__first1, __last1, __first2, __last2, __result,
66 __less<typename iterator_traits<_InputIterator1>::value_type,
67 typename iterator_traits<_InputIterator2>::value_type>());
68 }
69
70 _LIBCPP_END_NAMESPACE_STD
71
72 _LIBCPP_POP_MACROS
73
74 #endif // _LIBCPP___ALGORITHM_SET_INTERSECTION_H
75