libcxx/include/__memory/raw_storage_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___MEMORY_RAW_STORAGE_ITERATOR_H
  11 #define _LIBCPP___MEMORY_RAW_STORAGE_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 <__utility/move.h>
  19 #include <new>
  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 <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_RAW_STORAGE_ITERATOR)
  31
  32 _LIBCPP_SUPPRESS_DEPRECATED_PUSH
  33 template <class _OutputIterator, class _Tp>
  34 class _LIBCPP_TEMPLATE_VIS _LIBCPP_DEPRECATED_IN_CXX17 raw_storage_iterator
  35 #  if _LIBCPP_STD_VER <= 14 || !defined(_LIBCPP_ABI_NO_ITERATOR_BASES)
  36     : public iterator<output_iterator_tag, void, void, void, void>
  37 #  endif
  38 {
  39   _LIBCPP_SUPPRESS_DEPRECATED_POP
  40
  41 private:
  42   _OutputIterator __x_;
  43
  44 public:
  45   typedef output_iterator_tag iterator_category;
  46   typedef void value_type;
  47 #  if _LIBCPP_STD_VER >= 20
  48   typedef ptrdiff_t difference_type;
  49 #  else
  50   typedef void difference_type;
  51 #  endif
  52   typedef void pointer;
  53   typedef void reference;
  54
  55   _LIBCPP_HIDE_FROM_ABI explicit raw_storage_iterator(_OutputIterator __x) : __x_(__x) {}
  56   _LIBCPP_HIDE_FROM_ABI raw_storage_iterator& operator*() { return *this; }
  57   _LIBCPP_HIDE_FROM_ABI raw_storage_iterator& operator=(const _Tp& __element) {
  58     ::new ((void*)std::addressof(*__x_)) _Tp(__element);
  59     return *this;
  60   }
  61 #  if _LIBCPP_STD_VER >= 14
  62   _LIBCPP_HIDE_FROM_ABI raw_storage_iterator& operator=(_Tp&& __element) {
  63     ::new ((void*)std::addressof(*__x_)) _Tp(std::move(__element));
  64     return *this;
  65   }
  66 #  endif
  67   _LIBCPP_HIDE_FROM_ABI raw_storage_iterator& operator++() {
  68     ++__x_;
  69     return *this;
  70   }
  71   _LIBCPP_HIDE_FROM_ABI raw_storage_iterator operator++(int) {
  72     raw_storage_iterator __t(*this);
  73     ++__x_;
  74     return __t;
  75   }
  76 #  if _LIBCPP_STD_VER >= 14
  77   _LIBCPP_HIDE_FROM_ABI _OutputIterator base() const { return __x_; }
  78 #  endif
  79 };
  80
  81 #endif // _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_RAW_STORAGE_ITERATOR)
  82
  83 _LIBCPP_END_NAMESPACE_STD
  84
  85 _LIBCPP_POP_MACROS
  86
  87 #endif // _LIBCPP___MEMORY_RAW_STORAGE_ITERATOR_H