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Not every call of a virtual function is resolved dynamically. In fact, in many cases the compiler resolves the call statically, even if the function is declared virtual. For example:
- RealFakeName February 28, 2008class A
{
public:
virtual void func() {/*..*/}
};
int main()
{
A a;
A.func(); // resolved at compile time
}
Dynamic binding applies in two cases: when calling a virtual function through a pointer to a polymorphic object, and when calling a virtual function through a reference to a polymorphic object (a polymorphic object is one that declares or inherits at least one virtual member function). For example.:
void f(A & ref, A* pa)
{
ref.func(); // resolved dynamically
pa->func(); // resolved dynamically
}
int main()
{
A a;
f(a, &a);
}
You can bypass the dynamic binding mechanism by using explicit qualification with the scope operator:
pa->A::func(); // resolved statically