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/// \file
// Range v3 library
//
// Copyright Eric Niebler 2014-present
//
// Use, modification and distribution is subject to the
// Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
//
// Project home: https://github.com/ericniebler/range-v3
//
#ifndef RANGES_V3_ITERATOR_INSERT_ITERATORS_HPP
#define RANGES_V3_ITERATOR_INSERT_ITERATORS_HPP
#include <cstddef>
#include <utility>
#include <range/v3/range_fwd.hpp>
#include <range/v3/iterator/operations.hpp>
#include <range/v3/utility/addressof.hpp>
#include <range/v3/detail/prologue.hpp>
namespace ranges
{
/// \addtogroup group-iterator
/// @{
template<typename Container>
struct back_insert_iterator
{
using container_type = Container;
using difference_type = std::ptrdiff_t;
constexpr back_insert_iterator() = default;
constexpr explicit back_insert_iterator(Container & x)
: container_(detail::addressof(x))
{}
back_insert_iterator & operator=(typename Container::value_type const & value)
{
container_->push_back(value);
return *this;
}
back_insert_iterator & operator=(typename Container::value_type && value)
{
container_->push_back(std::move(value));
return *this;
}
back_insert_iterator & operator*()
{
return *this;
}
back_insert_iterator & operator++()
{
return *this;
}
back_insert_iterator operator++(int)
{
return *this;
}
private:
Container * container_ = nullptr;
};
struct back_inserter_fn
{
template<typename Container>
constexpr back_insert_iterator<Container> operator()(Container & x) const
{
return back_insert_iterator<Container>{x};
}
};
/// \sa `back_inserter_fn`
RANGES_INLINE_VARIABLE(back_inserter_fn, back_inserter)
template<typename Container>
struct front_insert_iterator
{
using container_type = Container;
using difference_type = std::ptrdiff_t;
constexpr front_insert_iterator() = default;
constexpr explicit front_insert_iterator(Container & x)
: container_(detail::addressof(x))
{}
front_insert_iterator & operator=(typename Container::value_type const & value)
{
container_->push_front(value);
return *this;
}
front_insert_iterator & operator=(typename Container::value_type && value)
{
container_->push_front(std::move(value));
return *this;
}
front_insert_iterator & operator*()
{
return *this;
}
front_insert_iterator & operator++()
{
return *this;
}
front_insert_iterator operator++(int)
{
return *this;
}
private:
Container * container_ = nullptr;
};
struct front_inserter_fn
{
template<typename Cont>
constexpr front_insert_iterator<Cont> operator()(Cont & cont) const
{
return front_insert_iterator<Cont>{cont};
}
};
/// \sa `front_inserter_fn`
RANGES_INLINE_VARIABLE(front_inserter_fn, front_inserter)
template<typename Container>
struct insert_iterator
{
using container_type = Container;
using difference_type = std::ptrdiff_t;
constexpr insert_iterator() = default;
constexpr explicit insert_iterator(Container & x, typename Container::iterator w)
: container_(detail::addressof(x))
, where_(w)
{}
insert_iterator & operator=(typename Container::value_type const & value)
{
where_ = ranges::next(container_->insert(where_, value));
return *this;
}
insert_iterator & operator=(typename Container::value_type && value)
{
where_ = ranges::next(container_->insert(where_, std::move(value)));
return *this;
}
insert_iterator & operator*()
{
return *this;
}
insert_iterator & operator++()
{
return *this;
}
insert_iterator & operator++(int)
{
return *this;
}
private:
Container * container_ = nullptr;
typename Container::iterator where_ = typename Container::iterator();
};
struct inserter_fn
{
template<typename Cont>
constexpr insert_iterator<Cont> operator()(Cont & cont,
typename Cont::iterator where) const
{
return insert_iterator<Cont>{cont, std::move(where)};
}
};
/// \sa `inserter_fn`
RANGES_INLINE_VARIABLE(inserter_fn, inserter)
namespace cpp20
{
using ranges::back_insert_iterator;
using ranges::back_inserter;
using ranges::front_insert_iterator;
using ranges::front_inserter;
using ranges::insert_iterator;
using ranges::inserter;
} // namespace cpp20
/// @}
} // namespace ranges
/// \cond
RANGES_DIAGNOSTIC_PUSH
RANGES_DIAGNOSTIC_IGNORE_MISMATCHED_TAGS
namespace std
{
template<typename Container>
struct iterator_traits<::ranges::back_insert_iterator<Container>>
: ::ranges::detail::std_output_iterator_traits<>
{};
template<typename Container>
struct iterator_traits<::ranges::front_insert_iterator<Container>>
: ::ranges::detail::std_output_iterator_traits<>
{};
template<typename Container>
struct iterator_traits<::ranges::insert_iterator<Container>>
: ::ranges::detail::std_output_iterator_traits<>
{};
} // namespace std
RANGES_DIAGNOSTIC_POP
/// \endcond
#include <range/v3/detail/epilogue.hpp>
#endif // RANGES_V3_ITERATOR_INSERT_ITERATORS_HPP
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