Re: [Boost-users] Using MPL to write is_derived_from_std_basic_ostream

From: Daryle Walker (darylew_at_[hidden])
Date: 2004-09-05 18:00:43

On 9/2/04 12:40 PM, "Jonathan Turkanis" <technews_at_[hidden]> wrote:

[SNIP]
> Note that it is fairly common for a stream to derive privately from
> basic_streambuf; with the current implementation, testing such a stream using
> is_streambuf causes a compiler error.

I think that using private inheritance as an quick & dirty containment
strategy is a bad idea in general.  (Which includes this usage.)  All the
member names of the contained object's class get injected as member names of
the container object's class.  Also, the container object's member functions
(and friends) still see the relationship as IS-A, even though it's supposed
to be HAS-A, so inappropriate conversions and/or uses won't be checked.

-- 
Daryle Walker
Mac, Internet, and Video Game Junkie
darylew AT hotmail DOT com