C/C++: goto into the for loop

Question

I have a bit unusual situation - I want to use goto statement to jump into the loop, not to jump out from it.

There are strong reasons to do so - this c

Answer 1

If I understand correctly, you're trying to do something on the order of:

• The first time foo is called, it needs to request some data from somewhere else, so it sets up that request and immediately returns;
• On each subsequent call to foo, it processes the data from the previous request and sets up a new request;
• This continues until foo has processed all the data.

I don't understand why you need the for loop at all in this case; you're only iterating through the loop once per call (if I understand the use case here). Unless i has been declared static, you lose its value each time through.

Why not define a type to maintain all the state (such as the current value of i) between function calls, and then define an interface around it to set/query whatever parameters you need:

typedef ... FooState;

void foo(FooState *state, ...)
{
  if (FirstCall(state))
  {
    SetRequest(state, 1);
  }
  else if (!Done(state))
  {
    // process data;
    SetRequest(state, GetRequest(state) + 1);
  }
}