んで呼び出す時は
void foo()
{
Base* p=new Derived;
Base* q=new Derived_Derived;
Derived* r=new Derived_Derived;
p->m_func();
q->m_func();
r->m_func();
delete p;
delete q;
delete r;
}

このように、俺はBaseのm_func()にしかキーワードvirtualを付けていないんだが、これであってる？

http://pc12.2ch.net/test/read.cgi/win/1237525619/127