how to declare a variable as polymorphic?

[rambo83]

Hello,

I would like to assign a data type to a variable first during the execution, but not at the beginning yet. How should then I declare such a variable first?

Below is my code, where I want to use it:

polymorphic Data type *net;
		 polymorphic Data type *netMin;
 
				    switch(which_network){
						case 0:			// Linear Output Feed Forward Network was chosen
							net = new LinOutFFNet(input, output, connectionMatrix);
							netMin = new LinOutFFNet(input, output, connectionMatrix);
 
							break;
						case 1:			// Feed Forward Network was chosen
							net = new FFNet(input, output, connectionMatrix);
							netMin = new FFNet(input, output, connectionMatrix);
 
							break;
						case 2:			// radial basis function network was chosen
							net = new RBFNet(input, output, connectionMatrix);
							netMin= new RBFNet(input, output, connectionMatrix);
 
							break;
				    }

polymorphic Data type *net;
		 polymorphic Data type *netMin;

				    switch(which_network){
						case 0:			// Linear Output Feed Forward Network was chosen
							net = new LinOutFFNet(input, output, connectionMatrix);
							netMin = new LinOutFFNet(input, output, connectionMatrix);

							break;
						case 1:			// Feed Forward Network was chosen
							net = new FFNet(input, output, connectionMatrix);
							netMin = new FFNet(input, output, connectionMatrix);

							break;
						case 2:			// radial basis function network was chosen
							net = new RBFNet(input, output, connectionMatrix);
							netMin= new RBFNet(input, output, connectionMatrix);
	
							break;
				    }

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Thank you

best regards,

Vitali