adding an accessor method to a subclass

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adding an accessor method to a subclass

(4 posts) (3 voices)

Started 10 months ago by kemnet
Latest reply from kemnet

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kemnet
Member

Hello.im trying to control my sprite using sneakyinput. So i have a class called boat thats a subclass of CCNode. (boat.h and boat.mm)
and Stage subclass of CCnode (stage.h and stage.mm) so my stage.mm looks a little like this

[code]
static stage* stageInstance;

//Accessor for the main GameScene object.
+(stave*) sharedstage
{
return stageInstance;
}
[/code]
and stage.h
[code]

+(stage*) sharedstage;
-(boat*) defaultboat;
[/code]

NOw this works fine. i can move my boat BUT i made boat a sub class of Body.h/body.mm so my boat.h looks like

@interface boat : Body {

}

and when i try adding "-(boat*) defaultboat;" to my stage.h i get the error "expected type-specifier before 'boat' and i have "#include body.h" in the header. BUT if i add "#include boat.h" to the header it says "cannot find interface declaration for 'body', superclass of 'boat'..

So i kinda need a way to reach down past the body class and get to my boat class so i can add -(boat)* defaultboat so i can control it OR if this isnt the way to go about controling a subclassed sprite i am open to correction

Posted 10 months ago #
Gray Olson
Member

This is a problem I recently had. It basically means that you have an import loop. To solve it, you need to use forward class declaration. I'm not exactly sure where, but you'll need to hunt them down yourself. Google for understanding what it is.

Posted 10 months ago #
clarus
Member
First, you should be using #import instead of #include, since it does a one-time include, similar to:
```
#ifndef  _MYHEADER_
  #define _MYHEADER_

// All the header guts
// .
// .
// .

#endif
```
If your boat class header file imports your body.h file, that should be sufficient for subclassing, unless the body class has boat objects in it for some reason. In that case, you do need to add

@class boat;

before you reference a boat object in the original class interface. But, I think that's the opposite of the problem you're seeing.

Just to make sure this isn't something really simple, you're using lowercase "boat" but you've got capitalized "Body" for the header file name and here:

@interface boat : Body {

but then lowercase "body.mm" for the implementation file name.

If your class is called "body" rather than "Body" then this won't work:

@interface boat : Body {

and it will generate exactly the error you're seeing even if you include the header file for your body definition (because "Body" <> "body").

You might want to verify that the case of your Body class interface and implementation matches what you're using in your boat.h file. Just a thought.
Posted 10 months ago #
kemnet
Member

Thanks for the tips.
i added @class boat to my header n i think it worked (note: i thinkk) but i didnt get the errors thanks :)

Posted 10 months ago #

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