Question

Motivation:

I have a function

func(const string& s);
{
    //...
}

of course this wont work:

func("hello" + " " + "world");

this solves that problem:

func(string&& s);

Is there a way to write func so that it automagically works with both r-value refs and l-value refs?

Answer 1

Rvalues bind to const lvalue refs with no problem. The problem with your code lies in types. You need at least one std::string for the overloaded operator+ to be used.

func(std::string("hello") + " " + "world");