A pure virtual function isn't supposed to have a body, but I just noticed that the following code is accepted by the compiler:
class foo
{
virtual void dummy() = 0
{
cout << "hello";
}
};
So, why are pure virtual functions allowed to have a body? Also, even when the function has a body, the class still can't be instantiated, why is that?
Pure virtual function can have a body, but the fact that you declare them pure virtual is exactly to say that a derived implementation is required.
You can execute the pure virtual method from a derived method (using an explicit BaseClass::method()) but still you have to provide an implementation.
Not being able to instantiate a class with a pure virtual method that has not been overriden is the main point of the pure virtual declaration. In other words the idea of declaring a method pure virtual is to ensure that the programmer will not forget about providing its implementation.
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