/*
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 * Copyright 2021, Danny Robson <danny@nerdcruft.net>
 */

#pragma once

#include <iterator>
#include <type_traits>
#include <utility>


///////////////////////////////////////////////////////////////////////////////
namespace cruft::iterator {
    /// An output iterator that calls insert on a supplied container
    template <typename ContainerT>
    struct unordered_insert {
    public:
        using iterator_category = std::output_iterator_tag;
        using value_type      = void;
        using difference_type = void;
        using pointer 	      = void;
        using reference 	  = void;

        unordered_insert (ContainerT &_target)
            : m_target (&_target)
        { ; }

        unordered_insert& operator++ () { return *this; }
        unordered_insert& operator * () { return *this; }
        unordered_insert& operator-> () { return  this; }

        template <typename ValueT>
        unordered_insert&
        operator= (ValueT &&val)
        {
            m_target->insert (std::forward<ValueT> (val));
            return *this;
        }

    private:
        ContainerT *m_target;
    };


    template <typename ContainerT>
    unordered_insert (ContainerT &) -> unordered_insert<std::remove_cvref_t<ContainerT>>;
}