Initialize pointer-to-struct declaration to an unnamed struct?

[Ehud Shapira]

But that doesn't help choose which element is being initialized.

union U
{
double d1 ;
double d2 ;
} u = 3.1415 ;

Both are the same, there's no "which".

union U
{
long l ;
double d ;
} u = 42 ;

Which element is being initialized?

Here there's ambiguity, so in this case I agree further qualification
would be needed. But requiring it for simple cases seems redundant.

int* p = new int ;

Of course this would be dynamic (with perhaps being optimized to a
static when this makes sense). I thought you were talking about cases
like simple, ctor-less, initialized structs.