Well, if anyone knows C++ (Object Factories)

[Aphex_Twin]

I'm trying to find a little C++ help fast. If you are up to it, take a look below...

I'm wrestling with generalizing object factories. I seem to not be able to insert function pointers into stl maps.

#include <iostream>
#include <map>

template <class ObjectType, class KeyType>
class Factory
{
public:
	Factory () {registry.empty(); }
	
	ObjectType* Create (KeyType name) 
	{
		std::map<KeyType, (*ObjectType)()>::iterator i;
		i=registry.find((KeyType)name);
		return *i();
	}
	
	bool Register (KeyType name, ObjectType* (*CreatorFunction)()) 
	{
		if (!IsRegistered(name)) 
		{
			registry[name] = CreatorFunction;
			return true;
		}
		return false;
	}
	
	bool UnRegister (KeyType name, ObjectType* (*CreatorFunction)()) 
	{
		if (!IsRegistered(name)) 
		{
			registry.erase ((KeyType)name);
			return true;
		}
		return false;
	}

	bool IsRegistered (KeyType name)
	{
		std::map<KeyType, (*ObjectType)()>::iterator i;
		i = registry.find ((KeyType)name);
		if (i != registry.end())	
			return true; 
		else 
			return false;
	}
private:	
	std::map<KeyType, (*ObjectType)()> registry;
};

class Shape
{
public:
	virtual void Rotate()=0;
	virtual void Translate()=0;
};
class Circle: public Shape
{
public:
	int x, y, z;
	void some_func (void) { std::cout << "Test!"; }
	void Rotate () { std::cout <<"Rotating circle\n"; }
	void Translate () { std::cout << "Translating circle\n";; }
};
Shape* CircleCreate (void) { return new Circle; }

class Triangle: public Shape
{
public:
	int x1, y1, x2, y2, x3, y3;
	void Rotate () { std::cout <<"Rotating triangle\n"; }
	void Translate () { std::cout << "Translating triangle\n"; }
};
Shape* TriangleCreate (void) { return new Triangle; }

class Square: public Shape
{
public:
	int x1, y1, x2, y2, l;
	void Rotate () { std::cout <<"Rotating square\n"; }
	void Translate () { std::cout << "Translating square\n"; }
};
Shape* SquareCreate (void) { return new Square; }

int main(int argc, char *argv[])
{
	Factory<std::string, Shape> factory;
	Shape *s;
	factory.Register ("triangle", TriangleCreate);
	factory.Register ("square", SquareCreate);
	factory.Register ("circle", CircleCreate);
	
	s = factory.Create("triangle");
	s->Rotate();

	return EXIT_SUCCESS;
}

My compiler gives off a few errors, primarily due to this line:
std::map<KeyType, (*ObjectType)()> registry;

 

[stormbind]

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