"David B. Held" <[EMAIL PROTECTED]> writes:
> "David Abrahams" <[EMAIL PROTECTED]> wrote in message
> [EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
>> [...]
>> In Boost.Python I'm using a system for interfaces such as this one
>> where optional template parameters can be passed in any order.
>> I'm using the properties of the type to detect their meaning. It
>> works great. Using boost/mpl/has_xxx.hpp (and, for compilers
>> which don't support it, is_base_and_derived) should be enough to
>> build a nice policy-based interface.
>
> By "works great", do you mean it works great for you as a library
> implementor, or it works great for users, and they feel it is a good
> way to specify policies?
Yes. Actually I don't think most of my users think they're specifying
policies when they do this -- you could even argue that my design
isn't policy-based, but that's really beside the point because the
crucial feature is that there are many parameters with useful
defaults. It just works and nobody thinks about it. I've never had a
support request or question related to this part of the interface.
--
David Abrahams
[EMAIL PROTECTED] * http://www.boost-consulting.com
Boost support, enhancements, training, and commercial distribution
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