Question

I am trying to iron out my first compile in a long time, and I think this is the last hurdle.

I am trying to create this type of hierarchy in my design.

  class chin_
  {
  private:
    charon_* engine;

  public:
    chin_();
    chin_(charon_ &handle)
    {
      engine = handle;
    }
    ~chin_();
  };

//////////////

  class charon_ {
  private:
    chin_ engine_input;

  public:
    charon_(){
      engine_input = chin_(this);
    }
    ~charon_();
  };

I am getting errors that tell me there is no matching function for call to

'chio::chin_::chin()'

it also says, mind you this is only when I change the constructor to charon_&

public:
        chin_(const charon_ &handle)
        {
          engine = handle;
        }
sys/../headers/chio.h:104:5: note:   no known conversion for argument 1 from ‘charon::charon_* const’ to ‘const charon::charon_&’

When I use the * instead of & I get this instead, which is by far more baffling.

sys/../headers/chio.h:104:5: note: chio::chin_::chin_(const charon::charon_*)
sys/../headers/chio.h:104:5: note:   candidate expects 1 argument, 0 provided

I’ve tried this and that, and I figure it is probably something super simple. I’ve tried to match my code up squarely with the examples I’ve found though so I don’t know what else I should be trying, I’d like to be able to figure this sort of stuff out on my own. I just am not having any luck with it.

EDIT:
I update the code but I left the updated error for the bottom.

sys/chin.cpp:19:14: error: cannot convert ‘charon::charon_’ to ‘charon::charon_*’ in assignment

It takes me to this code

  chin_::chin_(charon_ &handle) {
    engine = handle;
  }

engine is defined as
charon_* engine; and handle appears to be an address and should fall right into place, but it isn’t. I think I am not using this correctly.

Answer 1

When you declare something like this :

  chin_ engine_input;

chin_ needs a constructor with no parameters or you have to pass the parameters to it in the initializer list, otherwise you will get the error about no matching constructor.

What you can do is either have a default constructor that takes no params. Or make engine_input a pointer and create it with :

 engine_input = new chin_(handle);

Alternatively you can pass handle to chin_ in the initializer list like this :

 foo::foo(charon* handle):
 chin_(handle)
{

}