Re: [boost] [type_traits] fully qualified names

From: Peter Dimov (pdimov_at_[hidden])
Date: 2005-03-10 16:50:52

Jody Hagins wrote:
> The coding guidelines document (boost/more/int_const_guidelines.htm),
> states the following...
> 
> 
> Always use a fully qualified name to refer to an integral constant
> expression.
> 
> For example:
> 
> typedef myclass< ::boost::is_integral<some_type>::value> mytypedef;
> 
> Rationale: at least one compiler (Borland's), doesn't recognise the name 
> of a constant as an integral constant expression unless the name is
> fully qualified (which is to say it starts with ::).
> 
> 
> 
> 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.

This example doesn't contain any integral constant expressions, though.