What are capturing lambdas in C++14?

What are capturing lambdas in C++14?

Capturing lambdas in C++14 allow you to capture variables from the surrounding scope. This means you can use local variables inside the lambda.

Can you give me an example of a capturing lambda?

Sure! Here's a simple example:

int x = 10;
auto lambda = [&x]() { return x + 5; };
std::cout << lambda(); // Outputs 15

In this case, the lambda captures x by reference.

What is the difference between capturing by value and by reference?

Capturing by value creates a copy of the variable, while capturing by reference allows the lambda to access the original variable. Changes to the variable outside the lambda will reflect inside if captured by reference.

Are there any limitations to capturing lambdas?

Yes, one limitation is that you cannot capture variables that are out of scope. Also, if you capture by reference, you need to ensure the referenced variable remains valid for the lifetime of the lambda.