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 17 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 18 # pragma GCC system_header 19 #endif 20 21 _LIBCPP_BEGIN_NAMESPACE_STD 22 23 template <class _Compare, class _InputIterator1, class _InputIterator2, class _OutputIterator> 24 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _OutputIterator __merge( 25 _InputIterator1 __first1, 26 _InputIterator1 __last1, 27 _InputIterator2 __first2, 28 _InputIterator2 __last2, 29 _OutputIterator __result, 30 _Compare __comp) { 31 for (; __first1 != __last1; ++__result) { 32 if (__first2 == __last2) 33 return std::copy(__first1, __last1, __result); 34 if (__comp(*__first2, *__first1)) { 35 *__result = *__first2; 36 ++__first2; 37 } else { 38 *__result = *__first1; 39 ++__first1; 40 } 41 } 42 return std::copy(__first2, __last2, __result); 43 } 44 45 template <class _InputIterator1, class _InputIterator2, class _OutputIterator, class _Compare> 46 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _OutputIterator 47 merge(_InputIterator1 __first1, 48 _InputIterator1 __last1, 49 _InputIterator2 __first2, 50 _InputIterator2 __last2, 51 _OutputIterator __result, 52 _Compare __comp) { 53 return std::__merge<__comp_ref_type<_Compare> >(__first1, __last1, __first2, __last2, __result, __comp); 54 } 55 56 template <class _InputIterator1, class _InputIterator2, class _OutputIterator> 57 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _OutputIterator 58 merge(_InputIterator1 __first1, 59 _InputIterator1 __last1, 60 _InputIterator2 __first2, 61 _InputIterator2 __last2, 62 _OutputIterator __result) { 63 return std::merge(__first1, __last1, __first2, __last2, __result, __less<>()); 64 } 65 66 _LIBCPP_END_NAMESPACE_STD 67 68 #endif // _LIBCPP___ALGORITHM_MERGE_H 69