my derived classs override of that virtual function get invoked?
During the class Base’s constructor, the object isn’t yet a Derived, so if Base::Base() calls a virtual[20] function virt(), the Base::virt() will be invoked, even if Derived::virt() exists. Similarly, during Base’s destructor, the object is no longer a Derived, so when Base::~Base() calls virt(), Base::virt() gets control, not the Derived::virt() override. You’ll quickly see the wisdom of this approach when you imagine the disaster if Derived::virt() touched a member object from class Derived. In particular, if Base::Base() called the virtual function virt(), this rule causes Base::virt() to be invoked. If it weren’t for this rule, Derived::virt() would get called before the Derived part of a Derived object is constructed, and Derived::virt() could touch unconstructed member objects from the Derived part of a Derived object. That would be a disaster. ================================================== ============================ [23.
