#ifndef _Functions
#define _Functions 1

// --------------------------------------------------------------------------------------
// Arg_List is the structure passed to one of our functions.
struct Arg_List { 
  int     arg_count;       // the actual number of arguments (0,1, or 2)
  double *arg1;            // the first argument (if there), a pointer to the attribute
                           //   list for the person in the argument
  double *arg2;            // the second argument (if there), a pointer to the attribute
                           //   list for the person in the argument
};

// Prototype for Fuzzy Functions
typedef double (*fuzzy_fn) (const Arg_List &);

// --------------------------------------------------------------------------------------
// This forms the list of functions available to your program.  Each function
// will have a name and a function pointer.
// 
// To print out all available function names, use:
//     for(int i=0;i<num_functions;i++) 
//         cout << functions[i].fn_name << "\n";
//
// To call the function at position 3 using 0 arguments
//     Arg_List a;
//     double r;
//     a.arg_count = 0;
//     r = functions[3].fn_ptr(a); 

const int max_len=100;                  // longest function name

struct Function { 
   char         fn_name[max_len+1];
   fuzzy_fn     fn_ptr;
};

extern const int num_functions;          // set in Functions.cpp

extern Function *functions;              // pointer to array of size [num_functions],
                                         // allocated in Functions.cpp

#endif