What are lambda capture expressions in C++?

Can you explain what lambda capture expressions are in C++?

Sure! Lambda capture expressions allow you to capture variables from the surrounding scope in a lambda function.

How do I capture variables by value and by reference?

You can capture by value using [=] and by reference using [&]. For example, [x, &y] captures x by value and y by reference.

Can you give me an example of a lambda function using capture expressions?

Absolutely! Here's a simple example: auto add = [x, &y](int z) { return x + y + z; }; This captures x by value and y by reference.

What happens if the captured variable goes out of scope?

If a captured variable goes out of scope, accessing it in the lambda will lead to undefined behavior if it was captured by reference.