Object-Oriented Suicide or delete this;

Question

The following code compiled with MSVC9.0 runs and outputs Destructor four times, which is logical.

#include 
class SomeClass         


        

Answer 1

p->~SomeClass(); //line 5

p->CommitSuicide(); //line 6

Line (6) definitely invokes Undefined Behaviour.

That is, is invocation of another member after the explicit call of the destructor allowed (defined)?

No! Your assumption is correct.

Answer 2

"delete this" is ok as long as you do not attempt to call any code of that object after the deletion (not even the destructor). So a self deleting object shoud only be placed at the heap and shoud have a private destructor to protect from creation on the stack.

I dont know if a direct call to the destructor leads to undefined behaviour but a userdefined delete-operator would'nt get executed.

Answer 3

The delete this; is fine. The last p->CommitSuicide(); gives undefined behavior because you already destroyed the object in "line 5".