front_insert_iterator.hpp

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// SPDX-License-Identifier: BSL-1.0
#ifndef TETL_ITERATOR_FRONT_INSERT_ITERATOR_HPP
#define TETL_ITERATOR_FRONT_INSERT_ITERATOR_HPP
 
#include <etl/_iterator/tags.hpp>
#include <etl/_memory/addressof.hpp>
#include <etl/_utility/move.hpp>
 
namespace etl {

template <typename Container>
struct front_insert_iterator {
protected:
    Container* _container = nullptr;
 
public:
    using iterator_category = output_iterator_tag;
    using value_type        = void;
    using difference_type   = void;
    using pointer           = void;
    using reference         = void;
    using container_type    = Container;

    constexpr front_insert_iterator() noexcept = default;

    constexpr explicit front_insert_iterator(Container& container)
        : _container{etl::addressof(container)}
    {
    }

    constexpr auto operator=(typename Container::value_type const& value) -> front_insert_iterator&
    {
        _container->push_front(value);
        return *this;
    }

    constexpr auto operator=(typename Container::value_type&& value) -> front_insert_iterator&
    {
        _container->push_front(etl::move(value));
        return *this;
    }

    constexpr auto operator*() -> front_insert_iterator& { return *this; }

    constexpr auto operator++() -> front_insert_iterator& { return *this; }

    constexpr auto operator++(int) -> front_insert_iterator { return *this; }
};

template <typename Container>
[[nodiscard]] constexpr auto front_inserter(Container& c) -> front_insert_iterator<Container>
{
    return front_insert_iterator<Container>(c);
}
 
} // namespace etl
 
#endif // TETL_ITERATOR_FRONT_INSERT_ITERATOR_HPP