From: John Maddock (john_at_[hidden])
Date: 2005-03-11 06:42:55
> Always use a fully qualified name to refer to an integral constant
> expression.
Correct, but see below.
> However, it appears that the same compiler (BCB6) has problems if the
> '::' is left in. For example...
>
>
> template <class T>
> struct Foo
> {
> typedef typename ::boost::remove_reference< T >::type type;
> typedef typename ::boost::add_reference<
> typename ::boost::add_const< type >::type
> >::type ref_to_const_type;
> };
>
> fails to compile. Initially I thought it had something to do with
> typename (e.g., another BOOST_DEDUCED_TYPENAME) because, the first,
> simpler line compiles if I remove the "typename" keyword.
The thing is your typedef names a *type*, and *not* an integral constant
expression, and as you have discovered, typename can't be followed by ::
when using Borland.
Keep the typename and remove the :: when using types, but keep in in when
refering to values.
Simple eh? (Just kidding).
John.