How can I use lambda expressions in C++ standard algorithms?

How can I use lambda expressions in C++ standard algorithms?

You can use lambda expressions to create inline functions for algorithms like std::sort, std::for_each, and more.

Can you give me an example of using a lambda with std::sort?

Sure! Here's a simple example:

std::vector<int> vec = {5, 2, 9, 1};
std::sort(vec.begin(), vec.end(), [](int a, int b) { return a < b; });

This sorts the vector in ascending order.

What if I want to sort in descending order?

You can modify the lambda like this:

std::sort(vec.begin(), vec.end(), [](int a, int b) { return a > b; });

This will sort the vector in descending order.

Are there any performance considerations when using lambdas?

Lambdas are generally efficient, but if they capture large objects by value, it can impact performance. Use captures wisely!