MyGUI_Enumerator.h

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/*
 * This source file is part of MyGUI. For the latest info, see http://mygui.info/
 * Distributed under the MIT License
 * (See accompanying file COPYING.MIT or copy at http://opensource.org/licenses/MIT)
 */
 
#ifndef MYGUI_ENUMERATOR_H_
#define MYGUI_ENUMERATOR_H_
 
#include <cassert>
 
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_