Syntax Help Please

I'm playing around with genetic algorithms, and like always, i'm trying to templatize part of it. Although I'll probably abandon this code because I don't like where it's going, I'm still curious as to how I can get it to compile.

The problem I'm having is passing the template argument to "float fitness_score(Chromo<>:naType)". As is, i get the error:

37 C:\compilers\bloodshed\main.cpp invalid conversion from `float (*)(Chromo<32>:naType)' to `float (*)(Chromo<16>:naType)'

I've tried just about all I know, but I can't seem to get it to compile.

Code:

#include <cstdlib>
#include <iostream>

using namespace std;


template<int FieldSize = 32>
class Chromo
{
	public:
	struct DnaType{	unsigned dt_dna: FieldSize;	};

	Chromo(void) : geneCount(FieldSize){}
	Chromo(const Chromo<> &s) : geneCount(s.geneCount)
		{dna = s.dna;}
	
	float score(float (*sc)(DnaType));

	private:
	unsigned dna : FieldSize;
	const int geneCount;		
};


float fitness_score(Chromo<>::DnaType dt)
{
      //dummy function
      return 1.2f;
}

int main(int argc, char *argv[])
{
    const int x = 16;
    Chromo<x> ccc;          
       
    cout << ccc.score(fitness_score) << endl;
      
    system("PAUSE");    //dev-c++ generated
    return EXIT_SUCCESS;
}

Any ideas?

Well, the class has a default template argument of 32, so the argument to fitness_score() will always be 32, since it uses the default argument ( <> ). ccc on the other hand is initialized to use 16. These two are, of course, not compatible.

Perhaps ypou want to make your fitness_score a templated function?

i have tried, but i can't seem to find the right syntax for it

Just like any templated thingy:

Code:

template<int FieldSize = 32>
float fitness_score(Chromo<FieldSize>::DnaType dt)
{
      //dummy function
      return 1.2f;
}

...unless my memory fails me...