Re: [boost] is_polymorphic and unions

From: David Abrahams (dave_at_[hidden])
Date: 2003-03-18 23:08:40

Nicodemus <nicodemus_at_[hidden]> writes:

> I did it, but it didn't work. is_class<some_union>::value evaluates to
> true. 8/
>
> I believe that is_polymorphic<some_union>::value should evaluate to
> false, since unions can't be polymorphic.

Sure, but if we don't have a way to reliably distinguish unions from
classes, we're out of luck because there's no way to make
is_polymorphic do something special for unions.

We could put in the test for is_union and then ask users to
specialize is_union<U> for their unions U until they get compiler
support for that type trait.

best-i-can-do-ly y'rs,
Dave

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