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'operator=' unavailable ?

Started by edotorpedo Jun 10, 2002 at 3:07 PM 3 replies 450+ views

Original Post

Jun 10, 2002 at 3:07 PM

OK, I have a class without any pointers, say Camera. Now I''m trying to do this: class world { public: void set(Camera); private: Camera cam; }; void world::set(Camera c) { cam = c; } So why does this give an error ''operator='' uavailable. The VC++6 compiler should be smart enough to create its own assignment operator for class Camera??? I don''t get it. edotorpedo

Dez

Jun 10, 2002 at 3:15 PM

I think I know what you're talking about. When I get that messsage, it's usually because the class in question contains data members which are either constant or are reference variables.

The compiler's default assignment operator simply copies the memory from one object to the other, but it can't do that when there are either of these types of variables involved.

Try just changing them to pointers. The code might get a bit complex, so be careful.

[edited by - Dez on June 10, 2002 4:17:46 PM]

Palidine

200

Palidine

Jun 10, 2002 at 3:16 PM

please post your code for the Camera class.

edotorpedo

Author

edotorpedo

Jun 10, 2002 at 3:18 PM

Thanks dez!,

The camera class does contain a constant! Still...why can''t this class be copied? Shouldn''t be to hard to implement for a compiler.

Does anybody know this?

Thanks,

edotorpedo

Stoffel

Jun 10, 2002 at 3:24 PM

Just a note: two copies are potentially occuring here, one in the assignment, and another when you pass in the Camera argument. You can keep the same semantics and remove the copying in the argument by changing your prototype to:

void world::set (const Camera &c);

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