pointer to abstract class

[chaoslion]

Hey guys

i wanted to create an gui-env independent gui element so that i can choose
when it should be drawn or not, through the ->draw() function.
So i have created a pointer:

Code: Select all

gui::IGUIButton*btn;

and then the creation, which actually fails because he says
"cannot instantiate abstract class"

Code: Select all

btn = new gui::IGUIButton

where is the exact problem??

[Xaron]

The problem is, as the error message says, that the compiler can't (of course) create an instance of an abstract class because an abstract class doesn't have any implementation but just the interface. So the compiler can't create any code from it.

You have to use the class which implements the abstract class interface. So you should use

Code: Select all

btn = guiEnv->addButton(...);

instead.

Regards - Xaron

[belfegor]

i have the similar problem.and i solved it.see my post at
begginers help/ABSTRACT CLASS ERROR