genesis-3d_engine/Engine/addons/particles/pool.h

/****************************************************************************
Copyright (c) 2011-2013,WebJet Business Division,CYOU

http://www.genesis-3d.com.cn

Permission is hereby granted, free of charge, to any person obtaining a copy
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
****************************************************************************/
#ifndef __pool_H__
#define __pool_H__
#include "util/stl.h"



namespace Particles
{

	template <typename T>
	class Pool
	{
	public:
		typedef typename Util::STL_list<T*>::type PoolList;
		typedef typename PoolList::iterator PoolIterator; 
		PoolIterator mPoolIterator;

		//-----------------------------------------------------------------------
		Pool () 
		{
		};
		//-----------------------------------------------------------------------
		virtual ~Pool (void)
		{
		};
		//-----------------------------------------------------------------------

		inline bool isEmpty(void)
		{
			return mReleased.empty();
		};
		//-----------------------------------------------------------------------

		inline SizeT getSize(void)
		{
			return (SizeT)mReleased.size();
		};
		//-----------------------------------------------------------------------
		inline void resetIterator (void)
		{
			mPoolIterator = mReleased.begin();
		};
		//-----------------------------------------------------------------------
		inline T* getFirst (void)
		{
			resetIterator();
			if (end())
				return 0;

			return *mPoolIterator;
		};
		//-----------------------------------------------------------------------
		inline T* getNext (void)
		{
			if (end())
				return 0;

			mPoolIterator++;
			if (end())
				return 0;

			return *mPoolIterator;
		};
		//-----------------------------------------------------------------------
		inline bool end (void)
		{
			return mPoolIterator == mReleased.end();
		};
		//-----------------------------------------------------------------------
		inline void clear (void)
		{
			mLocked.clear();
			mReleased.clear();
		};
		//-----------------------------------------------------------------------
		/** 
		*/
		inline void addElement (T* element)
		{
			mLocked.push_back(element);
		};
		//-----------------------------------------------------------------------
		inline T* releaseElement (void)
		{
			if (mLocked.empty())
				return 0;

			T* t = mLocked.front();
			mReleased.splice(mReleased.end(), mLocked, mLocked.begin());
			return t;
		};
		//-----------------------------------------------------------------------
		inline void releaseAllElements (void)
		{
			mReleased.splice(mReleased.end(), mLocked);
			resetIterator();
		};
		//-----------------------------------------------------------------------
		inline void lockLatestElement (void)
		{
			mLocked.push_back(*mPoolIterator);
			mPoolIterator = mReleased.erase(mPoolIterator);
			if (mPoolIterator != mReleased.begin() && mPoolIterator != mReleased.end())
			{
				mPoolIterator--;
			}
		};
		//-----------------------------------------------------------------------
		inline void lockAllElements (void)
		{
			mLocked.splice(mLocked.end(), mReleased);
			resetIterator();
		};
		//-----------------------------------------------------------------------
		inline PoolList& getActiveElementsList(void)
		{
			return mReleased;
		};

	protected:
		PoolList mReleased;
		PoolList mLocked;
	};
}





#endif // __pool_H__