libcxx/include/__iterator/insert_iterator.h

   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 <__cstddef/ptrdiff_t.h>
  15 #include <__iterator/iterator.h>
  16 #include <__iterator/iterator_traits.h>
  17 #include <__memory/addressof.h>
  18 #include <__ranges/access.h>
  19 #include <__utility/move.h>
  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
  47 protected:
  48   _Container* container;
  49   __insert_iterator_iter_t<_Container> iter;
  50
  51 public:
  52   typedef output_iterator_tag iterator_category;
  53   typedef void value_type;
  54 #if _LIBCPP_STD_VER >= 20
  55   typedef ptrdiff_t difference_type;
  56 #else
  57   typedef void difference_type;
  58 #endif
  59   typedef void pointer;
  60   typedef void reference;
  61   typedef _Container container_type;
  62
  63   _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20
  64   insert_iterator(_Container& __x, __insert_iterator_iter_t<_Container> __i)
  65       : container(std::addressof(__x)), iter(__i) {}
  66   _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 insert_iterator&
  67   operator=(const typename _Container::value_type& __value) {
  68     iter = container->insert(iter, __value);
  69     ++iter;
  70     return *this;
  71   }
  72 #ifndef _LIBCPP_CXX03_LANG
  73   _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 insert_iterator&
  74   operator=(typename _Container::value_type&& __value) {
  75     iter = container->insert(iter, std::move(__value));
  76     ++iter;
  77     return *this;
  78   }
  79 #endif // _LIBCPP_CXX03_LANG
  80   _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 insert_iterator& operator*() { return *this; }
  81   _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 insert_iterator& operator++() { return *this; }
  82   _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 insert_iterator& operator++(int) { return *this; }
  83 };
  84
  85 template <class _Container>
  86 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 insert_iterator<_Container>
  87 inserter(_Container& __x, __insert_iterator_iter_t<_Container> __i) {
  88   return insert_iterator<_Container>(__x, __i);
  89 }
  90
  91 _LIBCPP_END_NAMESPACE_STD
  92
  93 _LIBCPP_POP_MACROS
  94
  95 #endif // _LIBCPP___ITERATOR_INSERT_ITERATOR_H