Potential problem in Builder: invalid object copy

[stephan b. <st...@s1...>]

      inline _BaseType*
      build(_BaseType const& __THAT) const {...}

Let's say i've got:

Builder<AType,BType> bob;

CType c;
AType * a = bob.build( c );

Doh! Undefined copy behaviour!

Also, it just occurred to me: all of the copy-based funcs are of course 
going to require that the type be Copyable, which may not be the case 
for some types. Many types which are default-constructable are not 
copyable. zB, singletons come to mind. It is also possible that BaseT 
implements Copyable but SubT does not, in which case such a call would 
fail... luckily, at compile time.

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