C++11: Rvalue References

To eliminate a copy of a source object during construction or assignment, a destination can be defined as an rvalue, so that a move is made instead of a copy. The symbol for an rvalue reference is &&. Here is an example:

#include

int main()

 {

    int&& i = 3;

    std::cout << i << std::endl;

    return 0;

}

// Output: 3

The above problem doesn’t look too useful, but imagine that the ‘3’ was an invisible temporary, which is another form of an rvalue.

Reference: https://isocpp.org/wiki/faq/cpp11-language#rval