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

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

C++ lambda expressions are often used for short, inline functions. They are great for callbacks, algorithms, and event handling.

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

Sure! You can use a lambda with std::sort to sort a vector based on custom criteria. For example:

std::vector<int> vec = {5, 2, 8, 1};
std::sort(vec.begin(), vec.end(), [](int a, int b) { return a > b; });

This sorts the vector in descending order.

What about using lambdas for event handling?

Lambdas are perfect for event handling in GUI applications. You can define a lambda to handle button clicks directly where you set up the event listener.

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.