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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-exception7//8//===----------------------------------------------------------------------===//9 10#ifndef _LIBCPP___ITERATOR_FRONT_INSERT_ITERATOR_H11#define _LIBCPP___ITERATOR_FRONT_INSERT_ITERATOR_H12 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 20#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)21# pragma GCC system_header22#endif23 24_LIBCPP_PUSH_MACROS25#include <__undef_macros>26 27_LIBCPP_BEGIN_NAMESPACE_STD28 29template <class _Container>30class front_insert_iterator31 : public __iterator_base<front_insert_iterator<_Container>, output_iterator_tag, void, void, void, void> {32protected:33 _Container* container;34 35public:36 typedef output_iterator_tag iterator_category;37 typedef void value_type;38#if _LIBCPP_STD_VER >= 2039 typedef ptrdiff_t difference_type;40#else41 typedef void difference_type;42#endif43 typedef void pointer;44 typedef void reference;45 typedef _Container container_type;46 47 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 explicit front_insert_iterator(_Container& __x)48 : container(std::addressof(__x)) {}49 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 front_insert_iterator&50 operator=(const typename _Container::value_type& __value) {51 container->push_front(__value);52 return *this;53 }54#ifndef _LIBCPP_CXX03_LANG55 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 front_insert_iterator&56 operator=(typename _Container::value_type&& __value) {57 container->push_front(std::move(__value));58 return *this;59 }60#endif // _LIBCPP_CXX03_LANG61 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 front_insert_iterator& operator*() { return *this; }62 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 front_insert_iterator& operator++() { return *this; }63 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 front_insert_iterator operator++(int) { return *this; }64};65_LIBCPP_CTAD_SUPPORTED_FOR_TYPE(front_insert_iterator);66 67template <class _Container>68inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 front_insert_iterator<_Container>69front_inserter(_Container& __x) {70 return front_insert_iterator<_Container>(__x);71}72 73_LIBCPP_END_NAMESPACE_STD74 75_LIBCPP_POP_MACROS76 77#endif // _LIBCPP___ITERATOR_FRONT_INSERT_ITERATOR_H78