What is the std::transform function in C++?

Can you explain what the std::transform function does in C++?

Sure! The std::transform function is used to apply a transformation to a range of elements in a container, such as an array or vector.

How do I use std::transform with a lambda function?

You can use std::transform with a lambda by passing the beginning and end iterators of the range, along with the lambda function as the transformation.

Can you give me a code example?

Absolutely! Here's a simple example:

#include <iostream>
#include <vector>
#include <algorithm>

int main() {
    std::vector<int> vec = {1, 2, 3, 4, 5};
    std::vector<int> result(vec.size());
    std::transform(vec.begin(), vec.end(), result.begin(), [](int x) { return x * 2; });
    for (int n : result) std::cout << n << ' '; // Outputs: 2 4 6 8 10
}

This doubles each element in the vector.

What headers do I need to include for std::transform?

You need to include <algorithm> for std::transform and <vector> if you're using vectors.