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 <__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 29 __set_union(_InputIterator1 __first1, _InputIterator1 __last1, 30 _InputIterator2 __first2, _InputIterator2 __last2, _OutputIterator __result, _Compare __comp) 31 { 32 for (; __first1 != __last1; ++__result) 33 { 34 if (__first2 == __last2) 35 return _VSTD::copy(__first1, __last1, __result); 36 if (__comp(*__first2, *__first1)) 37 { 38 *__result = *__first2; 39 ++__first2; 40 } 41 else 42 { 43 if (!__comp(*__first1, *__first2)) 44 ++__first2; 45 *__result = *__first1; 46 ++__first1; 47 } 48 } 49 return _VSTD::copy(__first2, __last2, __result); 50 } 51 52 template <class _InputIterator1, class _InputIterator2, class _OutputIterator, class _Compare> 53 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 54 _OutputIterator 55 set_union(_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_union<_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 65 set_union(_InputIterator1 __first1, _InputIterator1 __last1, 66 _InputIterator2 __first2, _InputIterator2 __last2, _OutputIterator __result) 67 { 68 return _VSTD::set_union(__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_UNION_H 78