Property with pure virtual function

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Adriano Coser - 22 Jul 2004 14:35 GMT

Hi. I'm declaring a property on a base class that is represented by a
pure virtual function. Something like this:

public:
__declspec( property( get=GetWidth ) ) int Width;
virtual int GetWidth() = 0;

I'm implementing GetWidth in all subclasses, but I got the following
linker error:

QIVReport error LNK2001: unresolved external symbol "public: virtual
int __thiscall TMyAbstractClass::GetWidth(void)"
(?GetWidth@TMyAbstractClass@@UAEHXZ)

If I turn the function non-pure the error desapears.

Is there a way to use a pure virtual function to represent a property?

Thanks in advance for any help.

Regards,
Adriano.

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Vince Yuan - 27 Jul 2004 01:43 GMT

a property cannot be a pure virtual function

Vince

> Hi. I'm declaring a property on a base class that is represented by a
> pure virtual function. Something like this:
[quoted text clipped - 18 lines]
> Regards,
> Adriano.

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David Olsen - 27 Jul 2004 19:17 GMT

> a property cannot be a pure virtual function

But it seems like there is a relatively simple workaround (which I
haven't tested):

public:
__declspec( property( get=DoGetWidth ) ) int Width;
int DoGetWidth() { return GetWidth(); }
virtual int GetWidth() = 0;

DoGetWidth could probably be private, since there is no good reason (in
this particular case) to expose it. DoGetWidth and GetWidth should
probably be const member functions.

>>Hi. I'm declaring a property on a base class that is represented by a
>>pure virtual function. Something like this:
[quoted text clipped - 13 lines]
>>
>>Is there a way to use a pure virtual function to represent a property?

Signature

David Olsen
qg4h9ykc5m@yahoo.com

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tom_usenet - 28 Jul 2004 12:46 GMT

>Hi. I'm declaring a property on a base class that is represented by a
>pure virtual function. Something like this:
[quoted text clipped - 13 lines]
>
>Is there a way to use a pure virtual function to represent a property?

You could try providing an implementation for the pure virtual
function (while leaving it pure virtual).

Tom.

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Property with pure virtual function

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