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_PUSH_MACROS
25 #include <__undef_macros>
26 
27 _LIBCPP_BEGIN_NAMESPACE_STD
28 
29 _LIBCPP_SUPPRESS_DEPRECATED_PUSH
30 template <class _Container>
31 class _LIBCPP_TEMPLATE_VIS insert_iterator
32 #if _LIBCPP_STD_VER <= 14 || !defined(_LIBCPP_ABI_NO_ITERATOR_BASES)
33     : public iterator<output_iterator_tag, void, void, void, void>
34 #endif
35 {
36 _LIBCPP_SUPPRESS_DEPRECATED_POP
37 protected:
38     _Container* container;
39     typename _Container::iterator iter; // FIXME: `ranges::iterator_t<Container>` in C++20 mode
40 public:
41     typedef output_iterator_tag iterator_category;
42     typedef void value_type;
43 #if _LIBCPP_STD_VER > 17
44     typedef ptrdiff_t difference_type;
45 #else
46     typedef void difference_type;
47 #endif
48     typedef void pointer;
49     typedef void reference;
50     typedef _Container container_type;
51 
52     _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 insert_iterator(_Container& __x, typename _Container::iterator __i)
53         : container(_VSTD::addressof(__x)), iter(__i) {}
54     _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 insert_iterator& operator=(const typename _Container::value_type& __value_)
55         {iter = container->insert(iter, __value_); ++iter; return *this;}
56 #ifndef _LIBCPP_CXX03_LANG
57     _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 insert_iterator& operator=(typename _Container::value_type&& __value_)
58         {iter = container->insert(iter, _VSTD::move(__value_)); ++iter; return *this;}
59 #endif // _LIBCPP_CXX03_LANG
60     _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 insert_iterator& operator*()        {return *this;}
61     _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 insert_iterator& operator++()       {return *this;}
62     _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 insert_iterator& operator++(int)    {return *this;}
63 };
64 
65 template <class _Container>
66 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
67 insert_iterator<_Container>
68 inserter(_Container& __x, typename _Container::iterator __i)
69 {
70     return insert_iterator<_Container>(__x, __i);
71 }
72 
73 _LIBCPP_END_NAMESPACE_STD
74 
75 _LIBCPP_POP_MACROS
76 
77 #endif // _LIBCPP___ITERATOR_INSERT_ITERATOR_H
78