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_UNION_H 10 #define _LIBCPP___ALGORITHM_SET_UNION_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 #endif 21 22 _LIBCPP_BEGIN_NAMESPACE_STD 23 24 template <class _Compare, class _InputIterator1, class _InputIterator2, class _OutputIterator> 25 _LIBCPP_CONSTEXPR_AFTER_CXX17 _OutputIterator 26 __set_union(_InputIterator1 __first1, _InputIterator1 __last1, 27 _InputIterator2 __first2, _InputIterator2 __last2, _OutputIterator __result, _Compare __comp) 28 { 29 for (; __first1 != __last1; ++__result) 30 { 31 if (__first2 == __last2) 32 return _VSTD::copy(__first1, __last1, __result); 33 if (__comp(*__first2, *__first1)) 34 { 35 *__result = *__first2; 36 ++__first2; 37 } 38 else 39 { 40 if (!__comp(*__first1, *__first2)) 41 ++__first2; 42 *__result = *__first1; 43 ++__first1; 44 } 45 } 46 return _VSTD::copy(__first2, __last2, __result); 47 } 48 49 template <class _InputIterator1, class _InputIterator2, class _OutputIterator, class _Compare> 50 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 51 _OutputIterator 52 set_union(_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_union<_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 62 set_union(_InputIterator1 __first1, _InputIterator1 __last1, 63 _InputIterator2 __first2, _InputIterator2 __last2, _OutputIterator __result) 64 { 65 return _VSTD::set_union(__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 #endif // _LIBCPP___ALGORITHM_SET_UNION_H 73