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11.14.2007 at 12:45PM PST, ID: 22961250
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8.6

Virtual functions & Destruction order

Asked by nivd in C++ Programming Language

Tags: , ,

Hi Experts,
I think that this is a hard one, as it really require understanding of how destruction order is done.
It is well known that when deleting an inherited class, it will first destruct itself and then destruct its base class.
However, I wonder when exactly will the object become invalid?
The following sample:
class A
{
public:
A(){}
virtual ~A();
virtual f()=0;
}

Class B : public A
{
public:
B() {};
virtual ~B(){};
virtual f(){};
int m_int;
}

When will accessing m_int considered as an access violation? after ~B and before ~A? only after ~A?
When will a call to f() will not be valid anymore due to pure virtual call? after ~B and before ~A? only after ~A?
When will the virtual table be deleted? does desctructing of each class removes its entries from the virtual table or it is done after all destrucors are completed.
What if there is a context switch before ~A is over?
Thanks
Niv
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[+][-]11.14.2007 at 12:50PM PST, ID: 20283677

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[+][-]11.14.2007 at 12:52PM PST, ID: 20283689

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[+][-]11.14.2007 at 12:55PM PST, ID: 20283720

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[+][-]11.14.2007 at 02:33PM PST, ID: 20284585

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[+][-]11.14.2007 at 09:50PM PST, ID: 20287162

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[+][-]11.15.2007 at 12:42AM PST, ID: 20287662

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About this solution

Zone: C++ Programming Language
Tags: virtual, order, destruction
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Solution Provided By: evilrix
Participating Experts: 4
Solution Grade: A
 
 
[+][-]11.15.2007 at 02:12AM PST, ID: 20287934

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