Solved

basic c++ polymorphism question

Posted on 2013-05-14
2
237 Views
Last Modified: 2013-05-14
Hi Experts,

I have a tree of different kinds of objects.  i.e., the child nodes of higher level parents are of different types.  However, they all implement a similar interface - ISomething.

If I delete any of the objects by using the interface pointer like this:

delete (ISomething*) theObject;

Am I also safely deleting the underlying full object?  I think not.

Thanks for confirming,
Mike
0
Comment
Question by:thready
2 Comments
 
LVL 86

Accepted Solution

by:
jkr earned 500 total points
ID: 39165249
>> Am I also safely deleting the underlying full object?

As long as the base class destructor is virtual, you are - see http://www.codersource.net/c/c-miscellaneous/c-virtual-destructors.aspx ("C++ Virtual destructors") and http://blogs.msdn.com/b/oldnewthing/archive/2004/05/07/127826.aspx ("When should your destructor be virtual?"). It's actually a simple thing to do, and may have heavy impact if you don't use it.
0
 
LVL 1

Author Closing Comment

by:thready
ID: 39165264
Makes sense!  Thank you! :)
0

Featured Post

Microsoft Certification Exam 74-409

Veeam® is happy to provide the Microsoft community with a study guide prepared by MVP and MCT, Orin Thomas. This guide will take you through each of the exam objectives, helping you to prepare for and pass the examination.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Errors will happen. It is a fact of life for the programmer. How and when errors are detected have a great impact on quality and cost of a product. It is better to detect errors at compile time, when possible and practical. Errors that make their wa…
This article shows you how to optimize memory allocations in C++ using placement new. Applicable especially to usecases dealing with creation of large number of objects. A brief on problem: Lets take example problem for simplicity: - I have a G…
The viewer will learn how to user default arguments when defining functions. This method of defining functions will be contrasted with the non-default-argument of defining functions.
The viewer will learn additional member functions of the vector class. Specifically, the capacity and swap member functions will be introduced.

778 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question