Re: [Boost-testing] Beginning tests with QNX 6

From: David Abrahams (dave_at_[hidden])
Date: 2005-10-21 08:54:15

Bronek Kozicki <brok_at_[hidden]> writes:

> Jim Douglas wrote:
>> main() {
>> 
>>     A   *MyPtr;
>>     MyPtr = new B;   // this is perfectly legal and very useful
>>     ...
>>     delete MyPtr;    // only calls the dtor for A
>> }
>> 
>> In the above example the delete would only clean up the base class A and 
>> leave bits of the derived class B lying around in memory causing a 
>
> this is actually undefined behaviour, and "pieces of former B
> object" might be corrupting heap state or the whole thing could just
> blow up

Unless B has a trivial destructor, of course.

-- 
Dave Abrahams
Boost Consulting
www.boost-consulting.com