What are the best practices for lambda capture in C++?

What are the best practices for lambda capture in C++?

When capturing variables in C++ lambdas, prefer using capture by reference when you need to modify the variable, and capture by value when you want to keep a copy. This helps avoid unintended side effects.

Can you explain the difference between capturing by value and by reference?

Sure! Capturing by value means the lambda gets a copy of the variable, while capturing by reference means it gets a reference to the original variable. If the original variable changes, the reference will reflect that change, but the value capture will not.

Are there any performance implications I should be aware of?

Yes, capturing by value can lead to performance overhead if the captured object is large, as it involves copying. In contrast, capturing by reference is generally more efficient but requires careful management of the variable's lifetime.

What about capturing this in member functions?

Capturing this in a lambda allows you to access member variables and functions. However, be cautious of the object's lifetime to avoid dangling references.