Question

I can’t compile this code because the function declaration depends on the class declaration, and the class declaration depends on the function declaration. Please help.

#include <iostream>
using namespace std;

void simulate(Policy& p);

class Policy {
public:
    Policy(int);
    int x;
    void eval();
};

int main() {
    Policy p(23);
    return 0;
}

Policy::Policy(int y) { x = y; }
void Policy::eval() { simulate(this); }

void simulate(Policy& p) { cout << ++p.x << endl; }

Answer 1

Place the prototype of your function below the definition of your class, but above the member functions.