How can I improve the performance of C++ lambda functions?

How can I improve the performance of C++ lambda functions?

To improve the performance of C++ lambda functions, consider using capture by reference instead of by value when possible.

What are the benefits of using capture by reference?

Capture by reference avoids unnecessary copies of variables, which can significantly reduce overhead, especially for large objects.

Are there any drawbacks to using capture by reference?

Yes, the main drawback is that the referenced variables must outlive the lambda, or you'll end up with dangling references.

Can you give an example of a lambda function with capture by reference?

Sure! Here's a simple example: int x = 10; auto lambda = [&x]() { return x * 2; }; This captures x by reference.