When you construct an instance of a derived class, what happens, exactly? If the class has a vtbl, the process goes something like the following:
Step 1: Construct the top-level base part:.
- Make the instance point to the base class's vtbl.
- Construct the base class instance member variables.
- Execute the body of the base class constructor.
Step 2: Construct the derived part(s) (recursively):
- Make the instance point to the derived class's vtbl.
- Construct the derived class instance member variables.
- Execute the body of the derived class constructor.
Destruction happens in reverse order, something like this:
Step 1: Destruct the derived part:
- (The instance already points to the derived class's vtbl.)
- Execute the body of the derived class destructor.
- Destruct the derived class instance member variables.
Step 2: Destruct the base part(s) (recursively):
- Make the instance point to the base class's vtbl.
- Execute the body of the base class destructor.
- Destruct the base class instance member variables.
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