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 26 _OutputIterator 27 __merge(_InputIterator1 __first1, _InputIterator1 __last1, 28 _InputIterator2 __first2, _InputIterator2 __last2, _OutputIterator __result, _Compare __comp) 29 { 30 for (; __first1 != __last1; ++__result) 31 { 32 if (__first2 == __last2) 33 return _VSTD::copy(__first1, __last1, __result); 34 if (__comp(*__first2, *__first1)) 35 { 36 *__result = *__first2; 37 ++__first2; 38 } 39 else 40 { 41 *__result = *__first1; 42 ++__first1; 43 } 44 } 45 return _VSTD::copy(__first2, __last2, __result); 46 } 47 48 template <class _InputIterator1, class _InputIterator2, class _OutputIterator, class _Compare> 49 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20 50 _OutputIterator 51 merge(_InputIterator1 __first1, _InputIterator1 __last1, 52 _InputIterator2 __first2, _InputIterator2 __last2, _OutputIterator __result, _Compare __comp) 53 { 54 return _VSTD::__merge<__comp_ref_type<_Compare> >(__first1, __last1, __first2, __last2, __result, __comp); 55 } 56 57 template <class _InputIterator1, class _InputIterator2, class _OutputIterator> 58 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20 59 _OutputIterator 60 merge(_InputIterator1 __first1, _InputIterator1 __last1, 61 _InputIterator2 __first2, _InputIterator2 __last2, _OutputIterator __result) 62 { 63 typedef typename iterator_traits<_InputIterator1>::value_type __v1; 64 typedef typename iterator_traits<_InputIterator2>::value_type __v2; 65 return _VSTD::merge(__first1, __last1, __first2, __last2, __result, __less<__v1, __v2>()); 66 } 67 68 _LIBCPP_END_NAMESPACE_STD 69 70 #endif // _LIBCPP___ALGORITHM_MERGE_H 71