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AnswerRe: IP address of the computer using VC++ Pin
ThatsAlok1-Mar-06 2:45
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Questionto link MDI interface to a dialog Pin
mailsafe28-Feb-06 22:41
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QuestionRe: to link MDI interface to a dialog Pin
Nibu babu thomas1-Mar-06 16:49
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QuestionUsing Sockets in Win32 DLL Pin
castratroi28-Feb-06 21:03
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Questionvirtual function declarations Pin
lastgen28-Feb-06 20:45
lastgen28-Feb-06 20:45 
AnswerRe: virtual function declarations Pin
lastgen28-Feb-06 20:55
lastgen28-Feb-06 20:55 
GeneralRe: virtual function declarations Pin
Cedric Moonen28-Feb-06 20:58
Cedric Moonen28-Feb-06 20:58 
AnswerRe: virtual function declarations Pin
Cedric Moonen28-Feb-06 20:57
Cedric Moonen28-Feb-06 20:57 
First, it is always usefull to add the exact error message when you got one. We cannot guess what the error message is (and in general they are really helpfull).

Now, to answer your question, the =0 means that this is a pure virtual function, that is a function that NEED to be redefined in the child classes. If you don't redefine them in child classes and if you try to instantiate your object, you will get an erro telling you that it cannot instantiate the class due to pure vitual function.

But in your example, I don't see why you get an unresolved external error if you don't add this =0. Maybe try to post more code and the exact error message.
AnswerRe: virtual function declarations Pin
Nibu babu thomas28-Feb-06 20:57
Nibu babu thomas28-Feb-06 20:57 
AnswerRe: virtual function declarations Pin
John R. Shaw28-Feb-06 23:03
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QuestionC++ Pin
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AnswerRe: C++ Pin
Nibu babu thomas28-Feb-06 20:10
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Ryan Binns28-Feb-06 20:11
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AnswerRe: C++ Pin
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QuestionIncremental backup of a disk. Pin
ashtwin28-Feb-06 19:36
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AnswerRe: Incremental backup of a disk. Pin
David Crow1-Mar-06 3:20
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Questioncopy file to URL Pin
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QuestionHow to hide standard toolbar in my simple appliation by default? Pin
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AnswerRe: How to hide standard toolbar in my simple appliation by default? Pin
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