How can I use lambdas with standard algorithms in C++?

How can I use lambdas with standard algorithms in C++?

You can use lambdas to create inline functions that can be passed to standard algorithms like std::sort, std::for_each, etc.

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

Sure! Here's a simple example:

#include <vector>
#include <algorithm>

int main() {
    std::vector<int> vec = {5, 2, 9, 1, 5, 6};
    std::sort(vec.begin(), vec.end(), [](int a, int b) { return a < b; });
}

This sorts the vector in ascending order using a lambda.

What if I want to sort in descending order?

You can modify the lambda to return a > b instead:

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 lead to performance overhead. Use captures wisely!