Re: [Boost-users] [MPL] implementing a "trait"?

Subject: Re: [Boost-users] [MPL] implementing a "trait"?
From: John M. Dlugosz (ngnr63q02_at_[hidden])
Date: 2014-02-05 02:57:13

On 2/4/2014 12:52 PM, Wouter van Ooijen wrote:
> I use
>
>     typedef void has_some_interface;
>
> inside the class to identify that a class implements some interface.

That's the kind I was looking for; thanks.

> In practice I write the identification type in an 'archetype'

I see that the archetype provides the typedef, but what's the point of the static 
functions?  You have to use the actual concrete type to call the right function, so having 
them declared in the base class doesn't let you use them in the manner of a virtual function.