Re: Give operator. a chance

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3 total messages Started by Claus A. Faerber Mon, 05 Feb 1996 22:59

#3250

Author: Claus A. Faerber
Date: Mon, 05 Feb 1996 22:59

51 lines
1878 bytes

IMO there's a better way than 'operator.()':

Simply say: 'If a class member identifier is not found  
within an object, all possible cast operators are scanned in  
order to find a conversion to an object of a class  
containing a member with this identifier.'

Eg.:

class A{
public: void A();
        void C();
}

class B{
public:
        void B();
        void C();
        void D();
}

class C{
        A* pA;
        B* pB;
public:
        void D();

        A& operator A&() { return *pA; };
        B& operator B&() { return *pB; };
}

//

C c;

c.A();  // calls ((A&)c).A();
c.B();  // calls ((B&)c).B();

c.C();  // calls ((A&)c).C();, as operator A& is first

c.D();  // calls c.D();, as D() is already member of C

Claus

------------------------------------------------------------------------
Claus Andre Faerber - claus@faerber.muc.de - http://www.muc.de/~cfaerber
------------------------------------------------------------------------
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Re: Give operator. a chance

#3258

Author: Andrew Koenig
Date: Tue, 06 Feb 1996 14:42

18 lines
1290 bytes

In article <62HLdPo3cDB@faerber.muc.de> claus@faerber.muc.de (Claus A.
Faerber) writes:

> IMO there's a better way than 'operator.()':

> Simply say: 'If a class member identifier is not found  
> within an object, all possible cast operators are scanned in  
> order to find a conversion to an object of a class  
> containing a member with this identifier.'

I suspect that makes compilation impossibly hard in the presence of templates.
-- 
				--Andrew Koenig
				  ark@research.att.com
---
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Re: Give operator. a chance

#3312

Author: Jerry Coffin
Date: Fri, 09 Feb 1996 00:18

14 lines
1277 bytes

claus@faerber.muc.de (Claus A. Faerber) wrote:

>IMO there's a better way than 'operator.()':

>Simply say: 'If a class member identifier is not found  
>within an object, all possible cast operators are scanned in  
>order to find a conversion to an object of a class  
>containing a member with this identifier.'

Which would be chosen if two or more possibilities would work?
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