Rvalue References Overview

              
12345678910111213141516171819
            
#include <iostream>

void process(int& x)
{
    std::cout << "Lvalue reference called with " << x << std::endl;
}

void process(int&& x)
{
    std::cout << "Rvalue reference called with " << x << std::endl;
}

int main()
{
    int a = 42;
    process(a);      // lvalue, calls process(int&)
    process(99);     // rvalue, calls process(int&&)
    process(std::move(a)); // rvalue, calls process(int&&)
}