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 # pragma clang include_instead(<algorithm>) 21 #endif 22 23 _LIBCPP_BEGIN_NAMESPACE_STD 24 25 template <class _Compare, class _InputIterator1, class _InputIterator2, class _OutputIterator> 26 _LIBCPP_CONSTEXPR_AFTER_CXX17 27 _OutputIterator 28 __merge(_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 *__result = *__first1; 43 ++__first1; 44 } 45 } 46 return _VSTD::copy(__first2, __last2, __result); 47 } 48 49 template <class _InputIterator1, class _InputIterator2, class _OutputIterator, class _Compare> 50 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 51 _OutputIterator 52 merge(_InputIterator1 __first1, _InputIterator1 __last1, 53 _InputIterator2 __first2, _InputIterator2 __last2, _OutputIterator __result, _Compare __comp) 54 { 55 typedef typename __comp_ref_type<_Compare>::type _Comp_ref; 56 return _VSTD::__merge<_Comp_ref>(__first1, __last1, __first2, __last2, __result, __comp); 57 } 58 59 template <class _InputIterator1, class _InputIterator2, class _OutputIterator> 60 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 61 _OutputIterator 62 merge(_InputIterator1 __first1, _InputIterator1 __last1, 63 _InputIterator2 __first2, _InputIterator2 __last2, _OutputIterator __result) 64 { 65 typedef typename iterator_traits<_InputIterator1>::value_type __v1; 66 typedef typename iterator_traits<_InputIterator2>::value_type __v2; 67 return _VSTD::merge(__first1, __last1, __first2, __last2, __result, __less<__v1, __v2>()); 68 } 69 70 _LIBCPP_END_NAMESPACE_STD 71 72 #endif // _LIBCPP___ALGORITHM_MERGE_H 73