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template with vc6

supagu · 2004-02-29T06:24:10

the following tempalte: class RegBase { public: virtual Obj* Create() { return 0; } }; template<class T> class ObjReg : public RegBase { public: ObjReg( const char* classId ) { ObjMgr::Register( classId, (RegBase*)this ); } Obj* Create() { printf("Creating the class complete@!!!\n"); return new T; //return 0; } protected: }; stops me compiling in vc6 when i got use it like: ObjReg regReg("chat"); the error says: f:\siphongl\engine\objmgr.h(61) : error C2259: 'Chat' : cannot instantiate abstract class due to following members: f:\siphongl\engine\objmgr.h(59) : while compiling class-template member function 'class Obj *__thiscall ObjReg::Create(void)' clicking on the error points to the line "return new T;" it works compiles fine on linux, so im guessing its a vc6 issue, would be nice to find a fix for it tho, or some alternative :-/ the idea of the tempalte is to register a class, and provide a method to create an instance of the class for my network code. [edited by - supagu on February 28, 2004 6:44:20 AM]

General and Gameplay Programming Programming

Started by supagu February 28, 2004 05:04 AM

14 comments, last by supagu 20 years, 1 month ago

supagu

148

Author

February 29, 2004 05:39 AM

the problem is, i cant create an instance of my class i want registered, because if its created it will automatically be replicated over the network which is bad.

tok_junior

229

February 29, 2004 05:57 AM

You can''t create an instance of it? Then what is it good for?
Do you mean you can''t create it on the heap, or that you can''t even create one on the stack using ''new''? Since the method using the downcasting works fine using any way of creation.

supagu

148

Author

February 29, 2004 05:59 AM

no i cant create in instance of it until i need it.... i cant just create them if im bored ;p

okay i found out why im getting this error in the first place:

Chat : Obj, NetObj
^ stops it compiling

Chat : Obj compiles fine

so i tried
Obj;
NetObj : Obj
Chat : NetObj

but then it doesnt work again :-/

doesnt like not directly inheriting from Obj!!!!!!
or multiple inheritence!!!!

[edited by - supagu on February 29, 2004 7:08:42 AM]

tok_junior

229

February 29, 2004 06:07 AM

You haven''t declared a pure virtual method in NetObj and forgot to define the method in chat by any chance?

--
MFC is sorta like the swedish police... It''''s full of crap, and nothing can communicate with anything else.

supagu

148

Author

February 29, 2004 06:13 AM

thats it !!! omG i've been trying to get that working for 3 weeks

thanks u

now another problem :-/

netobj extends obj as virtual,
and chat extends netobj as virtual, and i cant cast from obj to netobj

saying:
F:\SiphonGL\Engine\Client.cpp(176) : error C2635: cannot convert a 'Obj*' to a 'NetObj*'; conversion from a virtual base class is implied

[edited by - supagu on February 29, 2004 7:15:40 AM]

tok_junior

229

February 29, 2004 06:24 AM

I guess you could overload the = operator to do the job for you, by manually converting.
But from what i''ve read so far you have some major design-flaws. Maybe it could be a good idea to go back to the drawing-board with the modelling?

--
MFC is sorta like the swedish police... It''''s full of crap, and nothing can communicate with anything else.

template with vc6

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