Re: [boost] Re: Policy or Trait?

From: Rob Stewart (stewart_at_[hidden])
Date: 2004-04-02 11:05:58

From: David Abrahams <dave_at_[hidden]>
> 
> Technically one can never say "class template foo is a traits
> template" or "class template foo is a policy" without examining how
> it's used.  There's no fundamental reason that the same class template
> can't be used in both ways, so for any given class template, there may
> be no either/or answer.

I don't quite agree.  A policy class is only that because it is a
template parameter.  Whether a class that is passed as a policy
to some template happens to be a traits class is immaterial.  So,
in the context of the template, the template parameter is a
policy class and that may correspond to a traits class in a
particular specialization, but that doesn't make the traits class
a policy class.  Does that make sense?

-- 
Rob Stewart                           stewart_at_[hidden]
Software Engineer                     http://www.sig.com
Susquehanna International Group, LLP  using std::disclaimer;