Possible scoping bug?

[Martin von Loewis]

> Changing line 9 to
> 
> 	foo = (::foo*) 0;
> 
> or
> 	foo = (struct foo*) 0; 
> 
> makes it work.  Is this necessary?

Yes. This is explained in 3.3.7 [basic.scope.hiding]/2:

>> A class name (9.1) or enumeration name (7.2) can be hidden by the
>> name of an object, function, or enumerator declared in the same
>> scope. If a class or enumeration name and an object, function, or
>> enumerator are declared in the same scope (in any order) with the
>> same name, the class or enumeration name is hidden wherever the
>> object, function, or enumerator name is visible.

It later lists the two options you find: qualified lookup, and
elaborated type names.

Martin