What is std::move in C++11?

Can you explain what std::move does in C++11?

Sure! std::move is a utility that enables the transfer of resources from one object to another, allowing for move semantics.

How does it improve performance compared to copy semantics?

It avoids unnecessary copying of objects, which can be expensive, especially for large objects. Instead, it transfers ownership.

Can you give me an example of using std::move?

Absolutely! Here's a simple example:

#include <iostream>
#include <vector>
#include <utility> // for std::move

std::vector<int> createVector() {
    std::vector<int> vec = {1, 2, 3, 4, 5};
    return vec; // RVO applies here, but std::move can be used too.
}

int main() {
    std::vector<int> myVec = std::move(createVector());
    // myVec now owns the resources of the temporary vector.
}

Are there any downsides to using std::move?

Yes, if you use std::move on an object, it leaves the original object in a valid but unspecified state, so you must be careful.