Looking at reference parameters to functions

refs.cpp

/**
 * In this file we look at a couple of functions that accept an integer literal
 * and one that won't.
 *
 * g++ -std=c++11 refs.cpp -o refs
 */

#include <iostream>

void f( const int& i ){
    std::cout << "constant lvalue reference can be assigned a value" << std::endl;
}

void g( int&& i ){
    std::cout << "rvalue reference can be assigned a value" << std::endl;
}

void h( int& i ){
    std::cout << "non-const lvalue reference cannot be assigned a value." << std::endl;
}

int main(){
    f(1);
    g(1);
    //h(1); //if you uncomment this, you get a compiler error.
}