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_DIFFERENCE_H
10 #define _LIBCPP___ALGORITHM_SET_DIFFERENCE_H
11
12 #include <__config>
13 #include <__algorithm/comp.h>
14 #include <__algorithm/comp_ref_type.h>
15 #include <__algorithm/copy.h>
16 #include <__iterator/iterator_traits.h>
17
18 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
19 #pragma GCC system_header
20 #endif
21
22 _LIBCPP_PUSH_MACROS
23 #include <__undef_macros>
24
25 _LIBCPP_BEGIN_NAMESPACE_STD
26
27 template <class _Compare, class _InputIterator1, class _InputIterator2, class _OutputIterator>
28 _LIBCPP_CONSTEXPR_AFTER_CXX17 _OutputIterator
__set_difference(_InputIterator1 __first1,_InputIterator1 __last1,_InputIterator2 __first2,_InputIterator2 __last2,_OutputIterator __result,_Compare __comp)29 __set_difference(_InputIterator1 __first1, _InputIterator1 __last1,
30 _InputIterator2 __first2, _InputIterator2 __last2, _OutputIterator __result, _Compare __comp)
31 {
32 while (__first1 != __last1)
33 {
34 if (__first2 == __last2)
35 return _VSTD::copy(__first1, __last1, __result);
36 if (__comp(*__first1, *__first2))
37 {
38 *__result = *__first1;
39 ++__result;
40 ++__first1;
41 }
42 else
43 {
44 if (!__comp(*__first2, *__first1))
45 ++__first1;
46 ++__first2;
47 }
48 }
49 return __result;
50 }
51
52 template <class _InputIterator1, class _InputIterator2, class _OutputIterator, class _Compare>
53 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
54 _OutputIterator
set_difference(_InputIterator1 __first1,_InputIterator1 __last1,_InputIterator2 __first2,_InputIterator2 __last2,_OutputIterator __result,_Compare __comp)55 set_difference(_InputIterator1 __first1, _InputIterator1 __last1,
56 _InputIterator2 __first2, _InputIterator2 __last2, _OutputIterator __result, _Compare __comp)
57 {
58 typedef typename __comp_ref_type<_Compare>::type _Comp_ref;
59 return _VSTD::__set_difference<_Comp_ref>(__first1, __last1, __first2, __last2, __result, __comp);
60 }
61
62 template <class _InputIterator1, class _InputIterator2, class _OutputIterator>
63 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
64 _OutputIterator
set_difference(_InputIterator1 __first1,_InputIterator1 __last1,_InputIterator2 __first2,_InputIterator2 __last2,_OutputIterator __result)65 set_difference(_InputIterator1 __first1, _InputIterator1 __last1,
66 _InputIterator2 __first2, _InputIterator2 __last2, _OutputIterator __result)
67 {
68 return _VSTD::set_difference(__first1, __last1, __first2, __last2, __result,
69 __less<typename iterator_traits<_InputIterator1>::value_type,
70 typename iterator_traits<_InputIterator2>::value_type>());
71 }
72
73 _LIBCPP_END_NAMESPACE_STD
74
75 _LIBCPP_POP_MACROS
76
77 #endif // _LIBCPP___ALGORITHM_SET_DIFFERENCE_H
78