Re: [boost] [parameter] parameters<> and result_of

From: David Abrahams (dave_at_[hidden])
Date: 2006-09-28 13:39:08

"Eric Niebler" <eric_at_[hidden]> writes:

> David Abrahams wrote:
>> "Eric Niebler" <eric_at_[hidden]> writes:
>> 
>>>>> Another feature request: it would be nice if parameters<> were a
>>>>> valid MPL sequence that I could manipulate with MPL algorithms.
>>>> It already is an MPL sequence.
>>>
>>> No, it's not. An argument pack is an MPL sequence, but a
>>> parameters<> instantiation is not.
>> 
>> Oh, I see.  What would you use that capability for?
>
> I'd use it for the generic object construction utility I sent mail
> about a few days ago. The constructor parameters for facade<Object>
> should be the constructor parameters for Object, plus any additional
> parameters facade<> might need. So I need to be able to manipulate
> Object's parameters<> at compile time.

So essentially, you need to construct a new parameters<>
specialization with additional -- or fewer -- ParameterSpecs?

I think it's a fine idea, but I have to say, we're up to our eyeballs
in work to do on the parameter library right now.  So I guess you
should either put it in the tracker for later, or as ever, contribute
a most welcome patch.

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