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 <__config> 13 #include <__algorithm/copy.h> 14 #include <__algorithm/comp_ref_type.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 28 _OutputIterator 29 __merge(_InputIterator1 __first1, _InputIterator1 __last1, 30 _InputIterator2 __first2, _InputIterator2 __last2, _OutputIterator __result, _Compare __comp) 31 { 32 for (; __first1 != __last1; ++__result) 33 { 34 if (__first2 == __last2) 35 return _VSTD::copy(__first1, __last1, __result); 36 if (__comp(*__first2, *__first1)) 37 { 38 *__result = *__first2; 39 ++__first2; 40 } 41 else 42 { 43 *__result = *__first1; 44 ++__first1; 45 } 46 } 47 return _VSTD::copy(__first2, __last2, __result); 48 } 49 50 template <class _InputIterator1, class _InputIterator2, class _OutputIterator, class _Compare> 51 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 52 _OutputIterator 53 merge(_InputIterator1 __first1, _InputIterator1 __last1, 54 _InputIterator2 __first2, _InputIterator2 __last2, _OutputIterator __result, _Compare __comp) 55 { 56 typedef typename __comp_ref_type<_Compare>::type _Comp_ref; 57 return _VSTD::__merge<_Comp_ref>(__first1, __last1, __first2, __last2, __result, __comp); 58 } 59 60 template <class _InputIterator1, class _InputIterator2, class _OutputIterator> 61 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 62 _OutputIterator 63 merge(_InputIterator1 __first1, _InputIterator1 __last1, 64 _InputIterator2 __first2, _InputIterator2 __last2, _OutputIterator __result) 65 { 66 typedef typename iterator_traits<_InputIterator1>::value_type __v1; 67 typedef typename iterator_traits<_InputIterator2>::value_type __v2; 68 return _VSTD::merge(__first1, __last1, __first2, __last2, __result, __less<__v1, __v2>()); 69 } 70 71 _LIBCPP_END_NAMESPACE_STD 72 73 _LIBCPP_POP_MACROS 74 75 #endif // _LIBCPP___ALGORITHM_MERGE_H 76