Question

I am getting an error at the line “void operation” when I compile, because I havent defined Gate_ptr yet. I thought of exchanging the “Gate_ptr” with just “Gate*” instead in the function def. However, is there a way to maintain my current style?

  class Gate
    {
        public:
                Gate();
          void operation(Gate_ptr &gate_tail, string type, int input1, int input2=NULL);

        private:
                int cnt2;
                int input_val1, input_val2;
                int output, gate_number;
                int input_source1, input_source2;
                int fanout[8];
                Gate* g_next;
                string type;
};
typedef Gate* Gate_ptr;

Answer 1

Prefer this order:

 //forward decleration
class Gate;

//typedef based on forward dec.
typedef Gate* Gate_ptr; 

//class definition
class Gate
{
   public:
//...
};