v1/__iterator/insert_iterator.h

0001 // -*- C++ -*-
0002 //===----------------------------------------------------------------------===//
0003 //
0004 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
0005 // See https://llvm.org/LICENSE.txt for license information.
0006 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
0007 //
0008 //===----------------------------------------------------------------------===//
0009
0010 #ifndef _LIBCPP___ITERATOR_INSERT_ITERATOR_H
0011 #define _LIBCPP___ITERATOR_INSERT_ITERATOR_H
0012
0013 #include <__config>
0014 #include <__cstddef/ptrdiff_t.h>
0015 #include <__iterator/iterator.h>
0016 #include <__iterator/iterator_traits.h>
0017 #include <__memory/addressof.h>
0018 #include <__ranges/access.h>
0019 #include <__utility/move.h>
0020
0021 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
0022 #  pragma GCC system_header
0023 #endif
0024
0025 _LIBCPP_PUSH_MACROS
0026 #include <__undef_macros>
0027
0028 _LIBCPP_BEGIN_NAMESPACE_STD
0029
0030 #if _LIBCPP_STD_VER >= 20
0031 template <class _Container>
0032 using __insert_iterator_iter_t _LIBCPP_NODEBUG = ranges::iterator_t<_Container>;
0033 #else
0034 template <class _Container>
0035 using __insert_iterator_iter_t _LIBCPP_NODEBUG = typename _Container::iterator;
0036 #endif
0037
0038 _LIBCPP_SUPPRESS_DEPRECATED_PUSH
0039 template <class _Container>
0040 class _LIBCPP_TEMPLATE_VIS insert_iterator
0041 #if _LIBCPP_STD_VER <= 14 || !defined(_LIBCPP_ABI_NO_ITERATOR_BASES)
0042     : public iterator<output_iterator_tag, void, void, void, void>
0043 #endif
0044 {
0045   _LIBCPP_SUPPRESS_DEPRECATED_POP
0046
0047 protected:
0048   _Container* container;
0049   __insert_iterator_iter_t<_Container> iter;
0050
0051 public:
0052   typedef output_iterator_tag iterator_category;
0053   typedef void value_type;
0054 #if _LIBCPP_STD_VER >= 20
0055   typedef ptrdiff_t difference_type;
0056 #else
0057   typedef void difference_type;
0058 #endif
0059   typedef void pointer;
0060   typedef void reference;
0061   typedef _Container container_type;
0062
0063   _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20
0064   insert_iterator(_Container& __x, __insert_iterator_iter_t<_Container> __i)
0065       : container(std::addressof(__x)), iter(__i) {}
0066   _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 insert_iterator&
0067   operator=(const typename _Container::value_type& __value) {
0068     iter = container->insert(iter, __value);
0069     ++iter;
0070     return *this;
0071   }
0072 #ifndef _LIBCPP_CXX03_LANG
0073   _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 insert_iterator&
0074   operator=(typename _Container::value_type&& __value) {
0075     iter = container->insert(iter, std::move(__value));
0076     ++iter;
0077     return *this;
0078   }
0079 #endif // _LIBCPP_CXX03_LANG
0080   _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 insert_iterator& operator*() { return *this; }
0081   _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 insert_iterator& operator++() { return *this; }
0082   _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 insert_iterator& operator++(int) { return *this; }
0083 };
0084
0085 template <class _Container>
0086 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 insert_iterator<_Container>
0087 inserter(_Container& __x, __insert_iterator_iter_t<_Container> __i) {
0088   return insert_iterator<_Container>(__x, __i);
0089 }
0090
0091 _LIBCPP_END_NAMESPACE_STD
0092
0093 _LIBCPP_POP_MACROS
0094
0095 #endif // _LIBCPP___ITERATOR_INSERT_ITERATOR_H