What are some use cases for lambda expressions in C++?

What are some use cases for lambda expressions in C++?

Lambda expressions in C++ are often used for short, inline functions. They are particularly useful in algorithms, event handling, and as callbacks.

Can you give me an example of using a lambda expression with the STL?

Sure! You can use a lambda with std::sort to sort a vector based on a custom condition. For example: std::sort(vec.begin(), vec.end(), [](int a, int b) { return a > b; }); sorts the vector in descending order.

What about capturing variables in a lambda?

You can capture variables by value or by reference. For instance, [&x] captures x by reference, while [x] captures it by value. This allows the lambda to access or modify the variable.

Are there any performance considerations when using lambdas?

Yes, while lambdas are generally efficient, capturing large objects by value can lead to performance overhead. It's often better to capture by reference when possible.