How do I capture variables in C++ lambdas?

How do I capture variables in C++ lambdas?

In C++, you can capture variables in lambdas using the capture clause. You can capture by value or by reference.

Can you give me an example of capturing by value?

Sure! Here's an example: int x = 10; auto lambda = [x]() { return x + 5; }; This captures x by value.

What about capturing by reference?

To capture by reference, you can use &. For example: int x = 10; auto lambda = [&x]() { x += 5; }; This modifies x directly.

Are there any limitations to capturing variables?

Yes, if you capture a local variable by reference, it must outlive the lambda. Otherwise, you'll have a dangling reference.