When should I use std::shared_ptr in C++?

What is std::shared_ptr and when should I use it?

std::shared_ptr is a smart pointer in C++ that manages the lifetime of an object through reference counting. You should use it when you need shared ownership of an object, meaning multiple pointers can point to the same resource.

Can you give me an example of when to use std::shared_ptr?

Sure! If you have a resource that needs to be shared among multiple parts of your program, like a configuration object accessed by different modules, std::shared_ptr is ideal. It ensures that the resource is only deleted when the last shared pointer to it is destroyed.

Are there any downsides to using std::shared_ptr?

Yes, while std::shared_ptr is convenient, it can introduce overhead due to reference counting and may lead to circular references if not managed properly. In such cases, consider using std::weak_ptr to break the cycle.

When should I prefer std::unique_ptr over std::shared_ptr?

You should prefer std::unique_ptr when you want sole ownership of an object and don't need to share it. It's more efficient as it doesn't involve reference counting.