Someone asked this question a while ago, but I didn't
see a clear answer.

Given:

     class X a, b;
     a = (X)b;

There are two ways the compiler can handle the assignment:

     temp.X::X(b); a.X::operator=(temp); temp.X::~X();
or
     a.X::operator=(b)

Does an "identity conversion" with the functional cast notation
require that a temporary be created and the class's constructor
be called? Or is it optional? Or is it prohibited? Section 5.2.3
seems to require the temporary. Is there a section that permits
the optimization despite Section 5.2.3? Section and paragraph,
please.

Thanks,

     -- Dave

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