RE: [Dev-C++] Why doesn't this compile?

[Per W. <pw...@ia...>]

Style issues aside.

Correct me if I'm wrong but, your
  operator CDerived::MY_TYPE*();
converts from a CDerived object to a MY_TYPE*.

However, you try to use it to convert from a CDerived*.

This would work:
	MY_TYPE *p = *c;

/Per W

On Wed, 9 Oct 2002, Andrew Vidler wrote:

> Ummm...MY_TYPE can be any type, change it to "float" if you like,
> doesn't make any difference like I said.
> I know the constructors etc... aren't strictly needed, they don't stop
> it compiling or working though.
> Also, the constructors etc... *are* required for the actual
> implementation - this is just a stripped down and renamed version for
> test perposes.
> 
> Oh, and I disagree with the "better to 'return 0'" comment :)
> 0 is an integer, I know NULL is just #defined as 0, but using NULL
> implies a pointer type.
> You wouldn't type the following:
> 
> UINT I = 27 + NULL;
> 
> Would you?, so why write:
> 
> UINT *p = 0;
> 
> ?
> 
> -----Original Message-----
> From: dev...@li...
> [mailto:dev...@li...] On Behalf Of Ioannis
> Vranos
> Sent: 09 October 2002 15:54
> To: 'C++ Dev'
> Subject: RE: [Dev-C++] Why doesn't this compile?
> 
> 
> > -----Original Message-----
> > From: dev...@li...
> > [mailto:dev...@li...] On Behalf
> > Of Andrew Vidler
> > Sent: Tuesday, October 08, 2002 10:53 PM
> > To: C++ Dev
> > Subject: [Dev-C++] Why doesn't this compile?
> >
> >
> > And more importantly, how can I make it compile?!
> >
> >
> >
> > #define MY_TYPE IDirect3DBaseTexture8
> >
> > class CBase
> > {
> > 	public:
> > 		CBase() {}
> 
> 
> Not needed.
> 
> 
> > 		virtual ~CBase() {}
> 
> 
> Or better: virtual ~CBase();
> 
> 
> 
> >
> > 		virtual operator MY_TYPE * () = 0;
> 
> 
> Where is IDirect3DBaseTexture8 defined?
> 
> 
> 
> > };
> >
> > class CDerived : public CBase
> > {
> > 	public:
> > 		CDerived() {}
> > 		~CDerived() {}
> 
> 
> You can ommit the above two.
> 
> 
> >
> > 		operator MY_TYPE * () { return NULL; }
> 
> Better: return 0;
> 
> 
> IDirect3DBaseTexture8 not defined anywhere.
> 
> 
> 
> > };
> >
> > void	test()
> > {
> > 	CBase	*c = new CDerived();
> > 	MY_TYPE *f = c;
> > }
> >
> >
> >
> >
> > The #define is there purely so I could see if the code compiled with
> > different types - it doesn't.
> 
> 
> Ioannis
> 
> * Ioannis Vranos
> * Programming pages: http://www.noicys.freeurl.com
> * Alternative URL: http://run.to/noicys
> 
> 
> 
> 
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