“this” pointer in C (not C++)

Question

I\'m trying to create a stack in C for fun, and came up with the idea of using struct to represent the stack. Then I add function pointers to the struct for push() and pop()

Answer 1

The typical approach in C is to have functions expect this as the first parameter.

int push(Stack *self, int val) 
{
  if (self->current_size == self->max_size -1) return 0;
  self->data[self->current_size++] = val;
  return 1;
}

This has the added benefit that, unless you need polymorphism, you don't need to put the functions in the stack, because you could just call push(stack, 10) instead of stack->push(stack,10).