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/comp.h> 14 #include <__algorithm/comp_ref_type.h> 15 #include <__algorithm/copy.h> 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_PUSH_MACROS 23 #include <__undef_macros> 24 25 _LIBCPP_BEGIN_NAMESPACE_STD 26 27 template <class _Compare, class _InputIterator1, class _InputIterator2, class _OutputIterator> 28 _LIBCPP_CONSTEXPR_AFTER_CXX17 29 _OutputIterator 30 __merge(_InputIterator1 __first1, _InputIterator1 __last1, 31 _InputIterator2 __first2, _InputIterator2 __last2, _OutputIterator __result, _Compare __comp) 32 { 33 for (; __first1 != __last1; ++__result) 34 { 35 if (__first2 == __last2) 36 return _VSTD::copy(__first1, __last1, __result); 37 if (__comp(*__first2, *__first1)) 38 { 39 *__result = *__first2; 40 ++__first2; 41 } 42 else 43 { 44 *__result = *__first1; 45 ++__first1; 46 } 47 } 48 return _VSTD::copy(__first2, __last2, __result); 49 } 50 51 template <class _InputIterator1, class _InputIterator2, class _OutputIterator, class _Compare> 52 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 53 _OutputIterator 54 merge(_InputIterator1 __first1, _InputIterator1 __last1, 55 _InputIterator2 __first2, _InputIterator2 __last2, _OutputIterator __result, _Compare __comp) 56 { 57 typedef typename __comp_ref_type<_Compare>::type _Comp_ref; 58 return _VSTD::__merge<_Comp_ref>(__first1, __last1, __first2, __last2, __result, __comp); 59 } 60 61 template <class _InputIterator1, class _InputIterator2, class _OutputIterator> 62 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 63 _OutputIterator 64 merge(_InputIterator1 __first1, _InputIterator1 __last1, 65 _InputIterator2 __first2, _InputIterator2 __last2, _OutputIterator __result) 66 { 67 typedef typename iterator_traits<_InputIterator1>::value_type __v1; 68 typedef typename iterator_traits<_InputIterator2>::value_type __v2; 69 return _VSTD::merge(__first1, __last1, __first2, __last2, __result, __less<__v1, __v2>()); 70 } 71 72 _LIBCPP_END_NAMESPACE_STD 73 74 _LIBCPP_POP_MACROS 75 76 #endif // _LIBCPP___ALGORITHM_MERGE_H 77