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