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 <__utility/move.h>
18 #include <cstddef>
19 
20 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
21 #pragma GCC system_header
22 #endif
23 
24 _LIBCPP_BEGIN_NAMESPACE_STD
25 
26 _LIBCPP_SUPPRESS_DEPRECATED_PUSH
27 template <class _Container>
28 class _LIBCPP_TEMPLATE_VIS insert_iterator
29 #if _LIBCPP_STD_VER <= 14 || !defined(_LIBCPP_ABI_NO_ITERATOR_BASES)
30     : public iterator<output_iterator_tag, void, void, void, void>
31 #endif
32 {
33 _LIBCPP_SUPPRESS_DEPRECATED_POP
34 protected:
35     _Container* container;
36     typename _Container::iterator iter; // FIXME: `ranges::iterator_t<Container>` in C++20 mode
37 public:
38     typedef output_iterator_tag iterator_category;
39     typedef void value_type;
40 #if _LIBCPP_STD_VER > 17
41     typedef ptrdiff_t difference_type;
42 #else
43     typedef void difference_type;
44 #endif
45     typedef void pointer;
46     typedef void reference;
47     typedef _Container container_type;
48 
49     _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 insert_iterator(_Container& __x, typename _Container::iterator __i)
50         : container(_VSTD::addressof(__x)), iter(__i) {}
51     _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 insert_iterator& operator=(const typename _Container::value_type& __value_)
52         {iter = container->insert(iter, __value_); ++iter; return *this;}
53 #ifndef _LIBCPP_CXX03_LANG
54     _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 insert_iterator& operator=(typename _Container::value_type&& __value_)
55         {iter = container->insert(iter, _VSTD::move(__value_)); ++iter; return *this;}
56 #endif // _LIBCPP_CXX03_LANG
57     _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 insert_iterator& operator*()        {return *this;}
58     _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 insert_iterator& operator++()       {return *this;}
59     _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 insert_iterator& operator++(int)    {return *this;}
60 };
61 
62 template <class _Container>
63 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
64 insert_iterator<_Container>
65 inserter(_Container& __x, typename _Container::iterator __i)
66 {
67     return insert_iterator<_Container>(__x, __i);
68 }
69 
70 _LIBCPP_END_NAMESPACE_STD
71 
72 #endif // _LIBCPP___ITERATOR_INSERT_ITERATOR_H
73