[boost] Re: [type_traits] is_pointer<noncopyable> fails on CodeWarrior 9.4

From: David Abrahams (dave_at_[hidden])
Date: 2005-05-26 10:28:37

Howard Hinnant <hinnant_at_[hidden]> writes:

>
> I haven't dug into boost::is_pointer, but I'm guessing it involves a  
> tentative binding to an ellipsis:
>
>     template <class U> static two  test(...);
>
> 5.2.2p7 says that binding a non-POD class type to an ellipsis has  
> undefined behavior.  CodeWarrior's behavior in this context is to try  
> to pass the type by value by using the type's copy constructor, which  
> in this case is private, and thus triggers the access error.
>
> Metrowerks::is_pointer has a much simpler implementation.

We should probably be forwarding to the metrowerks implementation on
9.4, where it's available.  Failing that we can check is_class first
and avoid the rest of the check in that case.

-- 
Dave Abrahams
Boost Consulting
www.boost-consulting.com