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 <__algorithm/comp.h> 13 #include <__algorithm/comp_ref_type.h> 14 #include <__config> 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_BEGIN_NAMESPACE_STD 22 23 template <class _Compare, class _InputIterator1, class _InputIterator2, class _OutputIterator> 24 _LIBCPP_CONSTEXPR_AFTER_CXX17 _OutputIterator 25 __set_intersection(_InputIterator1 __first1, _InputIterator1 __last1, 26 _InputIterator2 __first2, _InputIterator2 __last2, _OutputIterator __result, _Compare __comp) 27 { 28 while (__first1 != __last1 && __first2 != __last2) 29 { 30 if (__comp(*__first1, *__first2)) 31 ++__first1; 32 else 33 { 34 if (!__comp(*__first2, *__first1)) 35 { 36 *__result = *__first1; 37 ++__result; 38 ++__first1; 39 } 40 ++__first2; 41 } 42 } 43 return __result; 44 } 45 46 template <class _InputIterator1, class _InputIterator2, class _OutputIterator, class _Compare> 47 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 48 _OutputIterator 49 set_intersection(_InputIterator1 __first1, _InputIterator1 __last1, 50 _InputIterator2 __first2, _InputIterator2 __last2, _OutputIterator __result, _Compare __comp) 51 { 52 typedef typename __comp_ref_type<_Compare>::type _Comp_ref; 53 return _VSTD::__set_intersection<_Comp_ref>(__first1, __last1, __first2, __last2, __result, __comp); 54 } 55 56 template <class _InputIterator1, class _InputIterator2, class _OutputIterator> 57 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 58 _OutputIterator 59 set_intersection(_InputIterator1 __first1, _InputIterator1 __last1, 60 _InputIterator2 __first2, _InputIterator2 __last2, _OutputIterator __result) 61 { 62 return _VSTD::set_intersection(__first1, __last1, __first2, __last2, __result, 63 __less<typename iterator_traits<_InputIterator1>::value_type, 64 typename iterator_traits<_InputIterator2>::value_type>()); 65 } 66 67 _LIBCPP_END_NAMESPACE_STD 68 69 #endif // _LIBCPP___ALGORITHM_SET_INTERSECTION_H 70