overwrite_insert_iterator.h

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/** @file
 *  @author Bram de Greve (bramz@users.sourceforge.net)
 *  @author Tom De Muer (tomdemuer@users.sourceforge.net)
 *
 *  *** BEGIN LICENSE INFORMATION ***
 *  
 *  The contents of this file are subject to the Common Public Attribution License 
 *  Version 1.0 (the "License"); you may not use this file except in compliance with 
 *  the License. You may obtain a copy of the License at 
 *  http://lass.sourceforge.net/cpal-license. The License is based on the 
 *  Mozilla Public License Version 1.1 but Sections 14 and 15 have been added to cover 
 *  use of software over a computer network and provide for limited attribution for 
 *  the Original Developer. In addition, Exhibit A has been modified to be consistent 
 *  with Exhibit B.
 *  
 *  Software distributed under the License is distributed on an "AS IS" basis, WITHOUT 
 *  WARRANTY OF ANY KIND, either express or implied. See the License for the specific 
 *  language governing rights and limitations under the License.
 *  
 *  The Original Code is LASS - Library of Assembled Shared Sources.
 *  
 *  The Initial Developer of the Original Code is Bram de Greve and Tom De Muer.
 *  The Original Developer is the Initial Developer.
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 *  Copyright (C) 2004-2007 the Initial Developer.
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 */

#ifndef LASS_GUARDIAN_OF_INCLUSION_STDE_OVERWRITE_INSERT_ITERATOR_H
#define LASS_GUARDIAN_OF_INCLUSION_STDE_OVERWRITE_INSERT_ITERATOR_H

#include "stde_common.h"

namespace lass
{
namespace stde
{

template <typename Container>
class overwrite_insert_iterator: public std::iterator<std::output_iterator_tag, void, void, void, void>
{
public:

    typedef Container container_type;

    explicit overwrite_insert_iterator(container_type& container): 
        container_(&container),
        end_(container.begin())
    {
    }

    overwrite_insert_iterator& operator=(const overwrite_insert_iterator& other)
    {
        container_ = other.container_;
        end_ = other.end_;
        return *this;
    }

    overwrite_insert_iterator& operator=(typename Container::const_reference x)
    {
        if (end_ != container_->end())
        {
            *end_++ = x;
        }
        else
        {
            container_->push_back(x);
            end_ = container_->end();
        }
        return *this;
    }

    overwrite_insert_iterator& operator*() { return *this; }
    overwrite_insert_iterator& operator++() { return *this; }
    overwrite_insert_iterator& operator++(int) { return *this; }

    typename Container::iterator begin() { return container_->begin(); }
    typename Container::iterator end() { return end_; }
    typename Container::const_iterator begin() const { return container_->begin(); }
    typename Container::const_iterator end() const { return end_; }

private:

    Container* container_;
    typename Container::iterator end_;
};

template <typename Container>
overwrite_insert_iterator<Container> overwrite_inserter(Container& container) 
{
    return overwrite_insert_iterator<Container>(container);
}

}
}

#endif

// EOF