1 // -*- C++ -*-
2 //===----------------------------------------------------------------------===//
3 //
4 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
5 // See https://llvm.org/LICENSE.txt for license information.
6 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7 //
8 //===----------------------------------------------------------------------===//
9 
10 #ifndef _LIBCPP___ITERATOR_INSERT_ITERATOR_H
11 #define _LIBCPP___ITERATOR_INSERT_ITERATOR_H
12 
13 #include <__config>
14 #include <__iterator/iterator.h>
15 #include <__iterator/iterator_traits.h>
16 #include <__memory/addressof.h>
17 #include <__ranges/access.h>
18 #include <__utility/move.h>
19 #include <cstddef>
20 
21 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
22 #  pragma GCC system_header
23 #endif
24 
25 _LIBCPP_PUSH_MACROS
26 #include <__undef_macros>
27 
28 _LIBCPP_BEGIN_NAMESPACE_STD
29 
30 #if _LIBCPP_STD_VER >= 20
31 template <class _Container>
32 using __insert_iterator_iter_t = ranges::iterator_t<_Container>;
33 #else
34 template <class _Container>
35 using __insert_iterator_iter_t = typename _Container::iterator;
36 #endif
37 
38 _LIBCPP_SUPPRESS_DEPRECATED_PUSH
39 template <class _Container>
40 class _LIBCPP_TEMPLATE_VIS insert_iterator
41 #if _LIBCPP_STD_VER <= 14 || !defined(_LIBCPP_ABI_NO_ITERATOR_BASES)
42     : public iterator<output_iterator_tag, void, void, void, void>
43 #endif
44 {
45 _LIBCPP_SUPPRESS_DEPRECATED_POP
46 protected:
47     _Container* container;
48     __insert_iterator_iter_t<_Container> iter;
49 public:
50     typedef output_iterator_tag iterator_category;
51     typedef void value_type;
52 #if _LIBCPP_STD_VER >= 20
53     typedef ptrdiff_t difference_type;
54 #else
55     typedef void difference_type;
56 #endif
57     typedef void pointer;
58     typedef void reference;
59     typedef _Container container_type;
60 
61     _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20 insert_iterator(_Container& __x, __insert_iterator_iter_t<_Container> __i)
62         : container(_VSTD::addressof(__x)), iter(__i) {}
63     _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20 insert_iterator& operator=(const typename _Container::value_type& __value)
64         {iter = container->insert(iter, __value); ++iter; return *this;}
65 #ifndef _LIBCPP_CXX03_LANG
66     _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20 insert_iterator& operator=(typename _Container::value_type&& __value)
67         {iter = container->insert(iter, _VSTD::move(__value)); ++iter; return *this;}
68 #endif // _LIBCPP_CXX03_LANG
69     _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20 insert_iterator& operator*()        {return *this;}
70     _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20 insert_iterator& operator++()       {return *this;}
71     _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20 insert_iterator& operator++(int)    {return *this;}
72 };
73 
74 template <class _Container>
75 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20
76 insert_iterator<_Container>
77 inserter(_Container& __x, __insert_iterator_iter_t<_Container> __i)
78 {
79     return insert_iterator<_Container>(__x, __i);
80 }
81 
82 _LIBCPP_END_NAMESPACE_STD
83 
84 _LIBCPP_POP_MACROS
85 
86 #endif // _LIBCPP___ITERATOR_INSERT_ITERATOR_H
87