libogre-dev 1.7.4+dfsg1-7 / usr / include / OGRE / OgreIteratorWrapper.h

/*
-----------------------------------------------------------------------------
This source file is part of OGRE
(Object-oriented Graphics Rendering Engine)
For the latest info, see http://www.ogre3d.org/

Copyright (c) 2000-2011 Torus Knot Software Ltd

Permission is hereby granted, free of charge, to any person obtaining a copy
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The above copyright notice and this permission notice shall be included in
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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THE SOFTWARE.
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*/
#ifndef __Ogre_Iterator_Wrapper_H__
#define __Ogre_Iterator_Wrapper_H__


namespace Ogre{

/** 
 * 
 * \brief Basefunctionality for IteratorWrappers
 *
 * 
 * \param T a Container like vector list map ...
 * \param IteratorType  T::iterator or T::const_iterator
 * \param ValType  T::mapped_type in case of a map, T::value_type for vector, list,...
 * 
 * have a look at VectorIteratorWrapper and MapIteratorWrapper for a concrete usage
*/
template <typename T, typename IteratorType, typename ValType>
class IteratorWrapper
{

	private:
		/// Private constructor since only the parameterised constructor should be used
		IteratorWrapper();

	protected:
		IteratorType mBegin;
		IteratorType mCurrent;
		IteratorType mEnd;
	

	public:
	
		/// type you expect to get by funktions like peekNext(Value)
		typedef ValType ValueType;
		/// type you expect to get by funktions like peekNext(Value)Ptr
		typedef ValType* PointerType;

		/**
		\brief typedef to fulfill container interface
		
		Userfull if you want to use BOOST_FOREACH
		\note there is no distinction between const_iterator and iterator.
		\n keep this in mind if you want to derivate from this class. 
		*/
		typedef IteratorType iterator;
		
		/**
		\brief typedef to fulfill container interface
		
		Userfull if you want to use BOOST_FOREACH
		\note there is no distinction between const_iterator and iterator.
		\n keep this in mind if you want to derivate from this class. 
		*/
		typedef IteratorType const_iterator;
		
		
		

		
        /** Constructor.
        @remarks
        Provide a start and end iterator to initialise.
        */
		IteratorWrapper ( IteratorType start, IteratorType last )
		: mBegin( start ), mCurrent ( start ), mEnd ( last )
		{
		}


		/** Returns true if there are more items in the collection. */
		bool hasMoreElements ( ) const
		{
			return mCurrent != mEnd;
		}


		/** Moves the iterator on one element. */
		void moveNext (  )
		{
			++mCurrent;
		}

		/** bookmark to the begin of the underlying collection */
		const IteratorType& begin() {return mBegin;}
		
		
		/** full access to the current  iterator */
		IteratorType& current(){return mCurrent;}
		
		/** bookmark to the end (one behind the last element) of the underlying collection */
		const IteratorType& end() {return mEnd;}
		

};



/** 
 * 
 * \brief Prepiared IteratorWrapper for container like std::vector 
 *
 * 
 * \param T = Container eg vector 
 * \param IteratorType  T::iterator or T::const_iterator
 * 
 * have a look at VectorIterator and ConstVectorIterator for a more concrete usage
*/
template <typename T, typename IteratorType>
class VectorIteratorWrapper : public IteratorWrapper<T, IteratorType, typename  T::value_type>
{

	public:
		typedef typename IteratorWrapper<T, IteratorType, typename  T::value_type>::ValueType ValueType ; 
		typedef typename IteratorWrapper<T, IteratorType, typename  T::value_type>::PointerType PointerType ;
	

		/**
		 * \brief c'tor
		 * 
		 * Constructor that provide a start and end iterator to initialise.
		 * 
		 * @param start start iterator 
		 * @param end end iterator 
		 */
		VectorIteratorWrapper ( IteratorType start, IteratorType last )
		: IteratorWrapper<T, IteratorType, typename T::value_type>( start, last ) 
		{
		}


		/** Returns the next(=current) element in the collection, without advancing to the next. */
		ValueType peekNext (  ) const
		{
			return *(this->mCurrent);
		}

		/** Returns a pointer to the next(=current) element in the collection, without advancing to the next afterwards. */
		PointerType peekNextPtr (  )  const
		{
			return &(*(this->mCurrent) );
		}

		/** Returns the next(=current) value element in the collection, and advances to the next. */
		ValueType getNext (  ) 
		{
			return *(this->mCurrent++);
		}	

};


/** 
 * 
 * \brief Concrete IteratorWrapper for nonconst access to the underlying container
 * 
 * \param T  Container 
 * 
*/
template <typename T>
class VectorIterator : public VectorIteratorWrapper<T,  typename T::iterator>{
	public:
        /** Constructor.
        @remarks
            Provide a start and end iterator to initialise.
        */	
		VectorIterator( typename T::iterator start, typename T::iterator last )
		: VectorIteratorWrapper<T,  typename T::iterator>(start , last )
		{
		}

        /** Constructor.
        @remarks
            Provide a container to initialise.
        */
		explicit VectorIterator( T& c )
		: VectorIteratorWrapper<T,  typename T::iterator> ( c.begin(), c.end() )
		{
		}
		
};

/** 
 * 
 * \brief Concrete IteratorWrapper for const access to the underlying container
 *
 * 
 * \param T = Container 
 * 
*/
template <typename T>
class ConstVectorIterator : public VectorIteratorWrapper<T,  typename T::const_iterator>{
	public:
        /** Constructor.
        @remarks
            Provide a start and end iterator to initialise.
        */	
		ConstVectorIterator( typename T::const_iterator start, typename T::const_iterator last )
		: VectorIteratorWrapper<T,  typename T::const_iterator> (start , last )
		{
		}

        /** Constructor.
        @remarks
            Provide a container to initialise.
        */
		explicit ConstVectorIterator ( const T& c )
		 : VectorIteratorWrapper<T,  typename T::const_iterator> (c.begin() , c.end() )
		{
		}
};





/** 
 * 
 * \brief Prepiared IteratorWrapper for key-value container
 *
 * 
 * \param T  Container  (map - or also set )
 * \param  IteratorType T::iterator or T::const_iterator
 * 
 * have a look at MapIterator and ConstMapIterator for a concrete usage
*/
template <typename T, typename IteratorType>
class MapIteratorWrapper  : public IteratorWrapper<T, IteratorType, typename T::mapped_type>
{

	public:
		/// redefined ValueType for a map/set
		typedef typename IteratorWrapper<T, IteratorType, typename  T::mapped_type>::ValueType ValueType ; 
		/// redefined PointerType for a map/set
		typedef typename IteratorWrapper<T, IteratorType, typename  T::mapped_type>::PointerType PointerType ;	
		
		///unused, just to make it clear that map/set::value_type is not a ValueType
		typedef typename T::value_type PairType ; 
		/// type you expect to get by funktions like peekNextKey
		typedef typename T::key_type KeyType;
        
        /** Constructor.
        @remarks
            Provide a start and end iterator to initialise.
        */
		MapIteratorWrapper ( IteratorType start, IteratorType last )
		: IteratorWrapper<T, IteratorType, typename T::mapped_type>( start, last ) 
		{
		}

        /** Returns the next(=current) key element in the collection, without advancing to the next. */
        KeyType peekNextKey(void) const
        {
            return this->mCurrent->first;
        }


		/** Returns the next(=current) value element in the collection, without advancing to the next. */
		ValueType peekNextValue (  ) const
		{
			return this->mCurrent->second;
		}


        /** Returns a pointer to the next/current value element in the collection, without 
        advancing to the next afterwards. */
		const PointerType peekNextValuePtr (  )  const
		{
			return &(this->mCurrent->second);
		}


        /** Returns the next(=current) value element in the collection, and advances to the next. */
        ValueType getNext()
        {
            return ((this->mCurrent++)->second) ;
        }	
	

};




/** 
 * 
 * \brief Concrete IteratorWrapper for nonconst access to the underlying key-value container
 *
 * 
 * \param T key-value container
 * 
*/
template <typename T>
class MapIterator : public MapIteratorWrapper<T,  typename T::iterator>{
	public:
	
        /** Constructor.
        @remarks
            Provide a start and end iterator to initialise.
        */	
		MapIterator( typename T::iterator start, typename T::iterator last )
		: MapIteratorWrapper<T,  typename T::iterator>(start , last )
		{
		}
		
        /** Constructor.
        @remarks
            Provide a container to initialise.
        */
		explicit MapIterator( T& c )
		: MapIteratorWrapper<T,  typename T::iterator> ( c.begin(), c.end() )
		{
		}
		
};


/** 
 * 
 * \brief Concrete IteratorWrapper for const access to the underlying key-value container
 *
 * 
 * \param T key-value container
 * 
*/
template <typename T>
class ConstMapIterator : public MapIteratorWrapper<T,  typename T::const_iterator>{
	public:
	
        /** Constructor.
        @remarks
            Provide a start and end iterator to initialise.
        */	
		ConstMapIterator( typename T::const_iterator start, typename T::const_iterator last )
		: MapIteratorWrapper<T,  typename T::const_iterator> (start , last )
		{
		}

        /** Constructor.
        @remarks
            Provide a container to initialise.
        */
		explicit ConstMapIterator ( const T& c )
		 : MapIteratorWrapper<T,  typename T::const_iterator> (c.begin() , c.end() )
		{
		}
};




}



#endif