When is Destructor Called for temporary variables?

Here is the code,

Code:

class A
{
};

A foo(A a)
{
       return a;
}

int main()
{
     A a;
     foo(a);
     
     return 1;
}

As we know, two temporary variables will be generated. One is when a is passed to foo and another one is when foo returns a A object. But when exactly is destructor invoked for these two temporary variables?[/QUOTE]