I stumbled upon a problem that I could not explain.
I want to know why static_cast does not work in this situation:
class ObjectBase
{
virtual ~ObjectBase();
};
class Object : public ObjectBase
{
virtual ~Object();
};
void ObjectBuilder::BuildObject(EObjectType eType, ObjectBase*& pObject)
{
switch (EObjectType)
{
...
case OBJECT:
pObject = new Object();
break;
...
}
}
// ........... somewhere in the program ...........
Object* pMyObject = 0;
objectBuilder.BuildObject(OBJECT, static_cast<ObjectBase*>(pMyObject));
Note that this code is just to illustrate the problem.
Why static_cast cannot work when the pointer is passed as a reference but works if it is passed by value? I am using VC 2005 if that matters.
Also I guess doing the same thing in two steps would work?
ObjectBase* pMyObjectBase = 0;
objectBuilder.BuildObject(OBJECT, pMyObjectBase);
Object* pMyObject = static_cast<Object*>(pMyObjectBase);
I am far from being a c++ guru (that would be quite fun), but I love those little "how-did-you-know-that?" details in programming languages.
Cheers!
