Virtual Destructors | C++ Tutorial

How and why to use virtual destructors in C++, including why they are very important to prevent memory leak bugs. Source code: github.com/por.... Check out www.portfolioc... to build a portfolio that will impress employers!

[@Lee13Mac]

Should the delete call within each class destructor be changed to delete[ ], given that new[ ] was used to allocate memory for the integer arrays?

[@variancewithin]

your videos are criminally underrated.

[@PortfolioCourses]

I'm glad you think so! :-)

[@wlcrutch]

Dude, thank you! Super clear! 🙏🏻🙏🏻🙏🏻

[@PortfolioCourses]

You're welcome! :-)

[@jaissonmonteiro9232]

Sorry my English, I am Brazilian 😅 anyway thanks for c++ tutorial playlist, I am learning so much with it 🤝👏🚀

[@PortfolioCourses]

Awesome! :-)

[@snowandl4195]

I think you're like Bob Ross but in programming

[@PortfolioCourses]

Hahahahaha that makes me really happy that you would say that! :-D I actually love having a Bob Ross video on in the background when I'm programming.

[@shafayet0198]

can we use delete [] array; to free the array instated of a loop?

[@PortfolioCourses]

Great question Akash! :-) Because we allocates space using new (instead of new []), we de-allocate the space using delete (instead of delete []). To do otherwise would result in undefined behavior in C++: stackoverflow.com/a/2425749.

[@mihirjog2707]

So is it a good practice to have your base class destructors always virtual, even if you're not using polymorphism? So that if we're to use it in future, we'll be safe?

[@Lee13Mac]

I was thinking the same thing - my guess is that a downside of such a practice is the efficiency lost to dynamic binding over static binding in cases where dynamic binding is not strictly necessary.

[@Emmanuel_Morris]

Thanks,Sir.🙌🏾

[@PortfolioCourses]

You're welcome Emmanuel! :-)

[@Vichained]

To be honest, I have watched this video many times but there is something that still doesnt make sense to me: Why would you create a derivedclass objetct using a Base class pointer? what would it be useful for?

[@PortfolioCourses]

Polymorphism is the reason, it can allow us to have an array of pointers to different types of child objects, with a loop working through the objects and calling each object's member functions. The binding of those function calls can be dynamic, which means each object can have its own 'behaviour' according to its type. Writing code like this can allow us to remove code duplication, and though it may not seem like it, it can actually be more understandable code in the long run too! This video talks about polymorphism more: kzbin.info/www/bejne/Y3e4mXpvbc2Xgqs

[@Vichained]

@@PortfolioCourses Now it makes sense. Thanks sir!

[@PortfolioCourses]

You’re welcome! :-)

[@xturki5741]

u are the best

[@PortfolioCourses]

Aww thanks for the kind feedback! :-)