Re: Framework design, initialization and framework usage

[Robert M. Münch via Digitalmars-d-learn]

On 2019-05-07 09:06:03 +0000, Kagamin said:

struct myFramework {
        myFrameworkAccessor myFWApp;
}
interface myFrameworkApp {
        void init();
}

main(){
        myFramework mf = new myFramework;

        mf.myFWApp.init(); // this bombs because myFWApp is NULL
}

struct myFrameworkAccessor {
        myFrameworkApp instance()
        {
                if(_instance==null)_instance=new myAppCode();
                return _instance;
        }
        myFrameworkApp _instance;
        alias instance this;
}

class myAppCode : myFrameworkApp {
        void init() {...}
}

Tried this in a simplex example but get a compile error:

Error: cannot implicitly convert expression `new 
myFramework(myFrameworkAccessor(null))` of type `myFramework*` to 
`myFramework`


--
Robert M. Münch
http://www.saphirion.com
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