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
__merge(_InputIterator1 __first1,_InputIterator1 __last1,_InputIterator2 __first2,_InputIterator2 __last2,_OutputIterator __result,_Compare __comp)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
merge(_InputIterator1 __first1,_InputIterator1 __last1,_InputIterator2 __first2,_InputIterator2 __last2,_OutputIterator __result,_Compare __comp)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
merge(_InputIterator1 __first1,_InputIterator1 __last1,_InputIterator2 __first2,_InputIterator2 __last2,_OutputIterator __result)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