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