The destructor is called as described in the concrrency tutorial.

r_val_ref_example.cpp

#include <iostream>
#include <string>

class BartoszMilewski{
public:
    BartoszMilewski(){
        greeting = "Hello";
        std::cout << greeting << std::endl;
    }   
    ~BartoszMilewski(){
        std::cout << greeting << std::endl;
    }   
    std::string greeting;
};

void takeRValue(BartoszMilewski && bm){
    bm.greeting = "Goodbye";
}

int main(){
    takeRValue(BartoszMilewski());
}