Re: [boost] typedefs within Concept or as Trait?

From: Doug Gregor (dgregor_at_[hidden])
Date: 2008-01-10 16:43:44

On Jan 10, 2008, at 3:40 PM, Michael Fawcett wrote:
>
> My questions are - when creating your own library, when do you choose
> nested typedefs over a traits class,

Never.

> and what effects does it have on
> a library user, both from a usability and extensibility point of view.
> What questions do you ask yourself to come to a decision?

Traits classes are far better than nested typedefs, because one can  
always specialize a traits class for an existing type---even if you  
can't modify the type because it is built-in or comes from another  
library that you can't modify.

        - Doug