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_ref_type.h> 14 #include <__algorithm/copy.h> 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_PUSH_MACROS 22 #include <__undef_macros> 23 24 _LIBCPP_BEGIN_NAMESPACE_STD 25 26 template <class _Compare, class _InputIterator1, class _InputIterator2, class _OutputIterator> 27 _LIBCPP_CONSTEXPR_AFTER_CXX17 _OutputIterator 28 __set_union(_InputIterator1 __first1, _InputIterator1 __last1, 29 _InputIterator2 __first2, _InputIterator2 __last2, _OutputIterator __result, _Compare __comp) 30 { 31 for (; __first1 != __last1; ++__result) 32 { 33 if (__first2 == __last2) 34 return _VSTD::copy(__first1, __last1, __result); 35 if (__comp(*__first2, *__first1)) 36 { 37 *__result = *__first2; 38 ++__first2; 39 } 40 else 41 { 42 if (!__comp(*__first1, *__first2)) 43 ++__first2; 44 *__result = *__first1; 45 ++__first1; 46 } 47 } 48 return _VSTD::copy(__first2, __last2, __result); 49 } 50 51 template <class _InputIterator1, class _InputIterator2, class _OutputIterator, class _Compare> 52 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 53 _OutputIterator 54 set_union(_InputIterator1 __first1, _InputIterator1 __last1, 55 _InputIterator2 __first2, _InputIterator2 __last2, _OutputIterator __result, _Compare __comp) 56 { 57 typedef typename __comp_ref_type<_Compare>::type _Comp_ref; 58 return _VSTD::__set_union<_Comp_ref>(__first1, __last1, __first2, __last2, __result, __comp); 59 } 60 61 template <class _InputIterator1, class _InputIterator2, class _OutputIterator> 62 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 63 _OutputIterator 64 set_union(_InputIterator1 __first1, _InputIterator1 __last1, 65 _InputIterator2 __first2, _InputIterator2 __last2, _OutputIterator __result) 66 { 67 return _VSTD::set_union(__first1, __last1, __first2, __last2, __result, 68 __less<typename iterator_traits<_InputIterator1>::value_type, 69 typename iterator_traits<_InputIterator2>::value_type>()); 70 } 71 72 _LIBCPP_END_NAMESPACE_STD 73 74 _LIBCPP_POP_MACROS 75 76 #endif // _LIBCPP___ALGORITHM_SET_UNION_H 77