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unsigned int gCurIDNum = 1; //global scope, at top, below includes

class ImageIDHandler
{
public:
ImageIDHandler() : _counter(1) {}
int getImageID(){ ++_counter; return _counter;}
private:
int _counter;
};

#include <stack>
#include <list>
#include <map>
#include <string>

using namespace std;

class IndexManager
{
	private:
		int Indices;
		stack<int> UnusedIndexStack; 
		list<int> UsedIndexList; 
		list<int>::iterator UsedIndexListIterator;
	public:
		IndexManager(void)
		{
		}

		IndexManager(int size)
		{
			Indices = size;
			for(size+=1;size>0;size--){
				UnusedIndexStack.push(size);
			}
		}

		~IndexManager(void){
		}	

		int Peek(void)
		{
			int ID;
			if(UnusedIndexStack.size() == 1){
				ID = Indices + 1;
			} else {
				ID = UnusedIndexStack.top();
			}
			return(ID);
		}

		int Pop(void)
		{
			int ID;
			if(UnusedIndexStack.size() == 1){
				ID = ++Indices;
			} else {
				ID = UnusedIndexStack.top();
				UnusedIndexStack.pop();
			}
			UsedIndexList.push_back(ID);
			return(ID);
		}

		void Push(int ID)
		{
			UnusedIndexStack.push(ID);
			UsedIndexList.remove(ID);
		}

		int Total(void)
		{
			return(Indices);
		}

		int Unused(void)
		{
			return(UnusedIndexStack.size());
		}

		int Used(void)
		{
			return(UsedIndexList.size());
		}
};

class ResourceManager
{
	private:
		IndexManager *Indexer;
		map<string,int> NameMap;
		map<string,int>::iterator NameMapIterator;
	public:

		ResourceManager(void){
		}

		ResourceManager(int size)
		{
			Indexer = new IndexManager(size);
		}

		~ResourceManager(void)
		{
			delete Indexer;
		}

		int Peek(void)
		{
			return(Indexer->Peek());
		}

		int Pop(void)
		{
			return(Indexer->Pop());
		}

		void Push(int ID)
		{
			Indexer->Push(ID);
		}
			
		int Add(string name)
		{

			if(!NameMap[name])
			{
				NameMap[name] = Indexer->Pop();
			}
			return(NameMap[name]);
		}
		
		void Remove(string name)
		{
			if(NameMap[name])
			{
				Indexer->Push(NameMap[name]);
				NameMap.erase(name);
			}
		}

		int Get(string name)
		{
			if(!NameMap[name]){return(-1);}
			return(NameMap[name]);
		}

		void Set(string name, int ID)
		{
			if(!NameMap[name])
			{
				NameMap[name] = ID;
			}
		}
};

ResourceManager *ImageResource     =  new ResourceManager(4096);

//New Image
int IMAGENAME = ImageResource->pop();
dbLoadObject("$filename", IMAGENAME);

//Delete Image
dbDeleteObject(IMAGENAME);
ImageResource->push(IMAGEENAME);