C++11 rvalue reference vs const reference

Question

This may be obvious but I think it is something difficult to me. Given this:

void test(std::string&&) { }

std::string x{\"test\"};
test(std::move(x)         


        

Answer 1

In simple terms:

• && can bind to non-const rvalues (prvalues and xvalues)
• const && can bind to rvalues (const and non-const)
• & can bind to non-const lvalues
• const & can bind to rvalues (prvalues and xvalues) and lvalues (const and non-const for each). A.k.a. to anything.