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_MERGE_H 10 #define _LIBCPP___ALGORITHM_MERGE_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_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _OutputIterator __merge( 26 _InputIterator1 __first1, 27 _InputIterator1 __last1, 28 _InputIterator2 __first2, 29 _InputIterator2 __last2, 30 _OutputIterator __result, 31 _Compare __comp) { 32 for (; __first1 != __last1; ++__result) { 33 if (__first2 == __last2) 34 return std::copy(__first1, __last1, __result); 35 if (__comp(*__first2, *__first1)) { 36 *__result = *__first2; 37 ++__first2; 38 } else { 39 *__result = *__first1; 40 ++__first1; 41 } 42 } 43 return std::copy(__first2, __last2, __result); 44 } 45 46 template <class _InputIterator1, class _InputIterator2, class _OutputIterator, class _Compare> 47 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _OutputIterator 48 merge(_InputIterator1 __first1, 49 _InputIterator1 __last1, 50 _InputIterator2 __first2, 51 _InputIterator2 __last2, 52 _OutputIterator __result, 53 _Compare __comp) { 54 return std::__merge<__comp_ref_type<_Compare> >(__first1, __last1, __first2, __last2, __result, __comp); 55 } 56 57 template <class _InputIterator1, class _InputIterator2, class _OutputIterator> 58 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _OutputIterator 59 merge(_InputIterator1 __first1, 60 _InputIterator1 __last1, 61 _InputIterator2 __first2, 62 _InputIterator2 __last2, 63 _OutputIterator __result) { 64 return std::merge(__first1, __last1, __first2, __last2, __result, __less<>()); 65 } 66 67 _LIBCPP_END_NAMESPACE_STD 68 69 #endif // _LIBCPP___ALGORITHM_MERGE_H 70