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 #  pragma clang include_instead(<iterator>)
24 #endif
25 
26 _LIBCPP_BEGIN_NAMESPACE_STD
27 
28 #if !defined(_LIBCPP_HAS_NO_CONCEPTS) && !defined(_LIBCPP_HAS_NO_INCOMPLETE_RANGES)
29 template <class _Container>
30 using __insert_iterator_iter_t = ranges::iterator_t<_Container>;
31 #else
32 template <class _Container>
33 using __insert_iterator_iter_t = typename _Container::iterator;
34 #endif
35 
36 _LIBCPP_SUPPRESS_DEPRECATED_PUSH
37 template <class _Container>
38 class _LIBCPP_TEMPLATE_VIS insert_iterator
39 #if _LIBCPP_STD_VER <= 14 || !defined(_LIBCPP_ABI_NO_ITERATOR_BASES)
40     : public iterator<output_iterator_tag, void, void, void, void>
41 #endif
42 {
43 _LIBCPP_SUPPRESS_DEPRECATED_POP
44 protected:
45     _Container* container;
46     __insert_iterator_iter_t<_Container> iter;
47 public:
48     typedef output_iterator_tag iterator_category;
49     typedef void value_type;
50 #if _LIBCPP_STD_VER > 17
51     typedef ptrdiff_t difference_type;
52 #else
53     typedef void difference_type;
54 #endif
55     typedef void pointer;
56     typedef void reference;
57     typedef _Container container_type;
58 
59     _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 insert_iterator(_Container& __x, __insert_iterator_iter_t<_Container> __i)
60         : container(_VSTD::addressof(__x)), iter(__i) {}
61     _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 insert_iterator& operator=(const typename _Container::value_type& __value_)
62         {iter = container->insert(iter, __value_); ++iter; return *this;}
63 #ifndef _LIBCPP_CXX03_LANG
64     _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 insert_iterator& operator=(typename _Container::value_type&& __value_)
65         {iter = container->insert(iter, _VSTD::move(__value_)); ++iter; return *this;}
66 #endif // _LIBCPP_CXX03_LANG
67     _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 insert_iterator& operator*()        {return *this;}
68     _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 insert_iterator& operator++()       {return *this;}
69     _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 insert_iterator& operator++(int)    {return *this;}
70 };
71 
72 template <class _Container>
73 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
74 insert_iterator<_Container>
75 inserter(_Container& __x, __insert_iterator_iter_t<_Container> __i)
76 {
77     return insert_iterator<_Container>(__x, __i);
78 }
79 
80 _LIBCPP_END_NAMESPACE_STD
81 
82 #endif // _LIBCPP___ITERATOR_INSERT_ITERATOR_H
83