Binding temporary to a lvalue reference

Question

I have the following code

string three()
{
    return \"three\";
}

void mutate(string& ref)
{
}

int main()
{
    mutate(three()); 
    return 0;
}
         


        

Answer 1

I guess it depends on the compiler. g++ 4.1.2 gives me this.

In function 'int main()':
Line 15: error: invalid initialization of non-const reference of type 'std::string&' from a temporary of type 'std::string'
compilation terminated due to -Wfatal-errors.

Maybe because you're not doing anything the call is optimized away.