Is it legal to pass a newly constructed object by reference to a function?

Question

Specifically, is the following legal C++?

class A{};

void foo(A*);
void bar(const A&);

int main(void)
{
    foo(&A());  // 1
    bar(A());  // 2
}

It a

Answer 1

No, it's against the standard to pass a non-const reference to a temporary object. You can use a const reference:

class A{};

void bar(const A&);

int main(void)
{
    bar(A());  // 2
}

So while some compliers will accept it, and it would work as long as don't use the memory after the semicolon, a conforming compiler will not accept it.