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// -*- C++ -*-
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef _LIBCPP___ITERATOR_FRONT_INSERT_ITERATOR_H
#define _LIBCPP___ITERATOR_FRONT_INSERT_ITERATOR_H
#include <__config>
#include <__iterator/iterator.h>
#include <__iterator/iterator_traits.h>
#include <__memory/addressof.h>
#include <__utility/move.h>
#include <cstddef>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif
_LIBCPP_PUSH_MACROS
#include <__undef_macros>
_LIBCPP_BEGIN_NAMESPACE_STD
_LIBCPP_SUPPRESS_DEPRECATED_PUSH
template <class _Container>
class _LIBCPP_TEMPLATE_VIS front_insert_iterator
#if _LIBCPP_STD_VER <= 14 || !defined(_LIBCPP_ABI_NO_ITERATOR_BASES)
: public iterator<output_iterator_tag, void, void, void, void>
#endif
{
_LIBCPP_SUPPRESS_DEPRECATED_POP
protected:
_Container* container;
public:
typedef output_iterator_tag iterator_category;
typedef void value_type;
#if _LIBCPP_STD_VER >= 20
typedef ptrdiff_t difference_type;
#else
typedef void difference_type;
#endif
typedef void pointer;
typedef void reference;
typedef _Container container_type;
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 explicit front_insert_iterator(_Container& __x)
: container(std::addressof(__x)) {}
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 front_insert_iterator&
operator=(const typename _Container::value_type& __value) {
container->push_front(__value);
return *this;
}
#ifndef _LIBCPP_CXX03_LANG
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 front_insert_iterator&
operator=(typename _Container::value_type&& __value) {
container->push_front(std::move(__value));
return *this;
}
#endif // _LIBCPP_CXX03_LANG
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 front_insert_iterator& operator*() { return *this; }
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 front_insert_iterator& operator++() { return *this; }
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 front_insert_iterator operator++(int) { return *this; }
};
_LIBCPP_CTAD_SUPPORTED_FOR_TYPE(front_insert_iterator);
template <class _Container>
inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 front_insert_iterator<_Container>
front_inserter(_Container& __x) {
return front_insert_iterator<_Container>(__x);
}
_LIBCPP_END_NAMESPACE_STD
_LIBCPP_POP_MACROS
#endif // _LIBCPP___ITERATOR_FRONT_INSERT_ITERATOR_H
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