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_BACK_INSERT_ITERATOR_H
11 #define _LIBCPP___ITERATOR_BACK_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 back_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 
38 protected:
39   _Container* container;
40 
41 public:
42   typedef output_iterator_tag iterator_category;
43   typedef void value_type;
44 #if _LIBCPP_STD_VER >= 20
45   typedef ptrdiff_t difference_type;
46 #else
47   typedef void difference_type;
48 #endif
49   typedef void pointer;
50   typedef void reference;
51   typedef _Container container_type;
52 
53   _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 explicit back_insert_iterator(_Container& __x)
54       : container(std::addressof(__x)) {}
55   _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 back_insert_iterator&
56   operator=(const typename _Container::value_type& __value) {
57     container->push_back(__value);
58     return *this;
59   }
60 #ifndef _LIBCPP_CXX03_LANG
61   _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 back_insert_iterator&
62   operator=(typename _Container::value_type&& __value) {
63     container->push_back(std::move(__value));
64     return *this;
65   }
66 #endif // _LIBCPP_CXX03_LANG
67   _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 back_insert_iterator& operator*() { return *this; }
68   _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 back_insert_iterator& operator++() { return *this; }
69   _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 back_insert_iterator operator++(int) { return *this; }
70 
71   _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _Container* __get_container() const { return container; }
72 };
73 _LIBCPP_CTAD_SUPPORTED_FOR_TYPE(back_insert_iterator);
74 
75 template <class _Container>
76 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 back_insert_iterator<_Container>
77 back_inserter(_Container& __x) {
78   return back_insert_iterator<_Container>(__x);
79 }
80 
81 _LIBCPP_END_NAMESPACE_STD
82 
83 _LIBCPP_POP_MACROS
84 
85 #endif // _LIBCPP___ITERATOR_BACK_INSERT_ITERATOR_H
86