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

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

Lambda expressions in C++ are useful for creating anonymous functions. They can be used in algorithms, callbacks, and event handling.

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 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 great for event handling in GUI applications. For instance, you can connect a button click event to a lambda function that executes specific code when the button is clicked.

Are there any performance considerations when using lambda expressions?

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.