MyGUI_Enumerator.h

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/*
    This file is part of MyGUI.

    MyGUI is free software: you can redistribute it and/or modify
    it under the terms of the GNU Lesser General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    MyGUI is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public License
    along with MyGUI.  If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef __MYGUI_ENUMERATOR_H__
#define __MYGUI_ENUMERATOR_H__

#include <assert.h>

namespace MyGUI
{

    template<typename T>
    class Enumerator
    {
    private:
        Enumerator() { }

    public:
        explicit Enumerator(const T& _container) :
            m_first(true),
            m_current(_container.begin()),
            m_end(_container.end())
        {
        }

        Enumerator(typename T::const_iterator _first, typename T::const_iterator _end) :
            m_first(true),
            m_current(_first),
            m_end(_end)
        {
        }

        bool next()
        {
            if (m_current == m_end) return false;
            else if (m_first)
            {
                m_first = false;
                return true;
            }
            ++ m_current;
            if (m_current == m_end) return false;
            return true;
        }

        typename T::const_reference operator->() const { assert(m_current != m_end); return (*m_current); }
        typename T::const_reference current() { assert(m_current != m_end); return (*m_current); }

    private:
        bool m_first;
        typename T::const_iterator m_current;
        typename T::const_iterator m_end;
    };

} // namespace MyGUI

#endif // __MYGUI_ENUMERATOR_H__

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