#include <utility>
#include <type_traits>
#include <iostream>
 
struct foo{};
 
template<typename T>
void bar2(T&& t)
{
    std::cout << __PRETTY_FUNCTION__ << ' '
               << std::is_rvalue_reference<decltype(t)>::value << '\n';
}
 
template<typename T>
void bar1(T&& t)
{
    std::cout << __PRETTY_FUNCTION__ << ' '
              << std::is_rvalue_reference<decltype(t)>::value << '\n';
    bar2(std::forward<T>(t));
    bar2(t);
}
 
int main()
{
    foo f;
    bar1(f);
    std::cout << "--------\n";
    bar1(foo{});
}
 

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