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POINTERS TO FUNCTIONS IN METHOD DEFINITIONS

I want to write a method that will accept a pointer to a C function.
For example, let the function be a simple Gaussian:-

void gaussian(x,a,y)
float x,a[],*y;
{
  float arg;
  
  arg = (x-a[2])/a[3];
  *y += a[1]*exp(-arg*arg);
}

In the interface file I would expect (Kernigham amd Ritchie section 5.11)
the method definition to look like 

- methodName:void(*gaussian)(float, float*, float*);

and in the implementation file I may have

- methodName:void(*gaussian)(float, float*, float*)
{
  // ...
  return self;
}

When I try to do this the compiler gives me the message

  parse error before `void'
  
Any suggestions ?

Alastair McLean
alastair@hecate.phy.queensu.ca