Re: [boost] [mpl] Metafunction terminology - revival?

From: Aleksey Gurtovoy (agurtovoy_at_[hidden])
Date: 2006-07-25 22:18:15

David Bergman writes:
> Aleksey Gurtovoy wrote:
>
>> Joaquín López Muñoz writes:
>> > Please correct if I'm wrong, but I'd say the official 
>> definition for a 
>> > MPL lambda expression:
>> >
>> > http://boost.org/libs/mpl/doc/refmanual/lambda-expression.html
>> >
>> > actually encompasses both metafunction classes and placeholder 
>> > expressions ("proper" lambda expressions, if you wish), so "lambda 
>> > expression" is the common name you're after. Am I missing something?
>> 
>> Nope, you are 100% correct.
>
> Ok, so
>
> 	struct Map { template<typename T> struct apply { typedef int type; }; };
>
> is a "lambda expression" then? 

One of its forms, and among other things, yes.

> A bit weird in my book, but if that is the
> official nomenclature for MPL, I will use it...
>
> By the way, Aleksey, what do you think of calling anything
> applicable via mpl::apply a "metafunctor"?

Being one of these people who frown upon the term "functor"
(http://groups.google.com/group/boost-list/msg/d3d7546f3e8b1188), I'm
not in favor of this one, for obvious reasons :).

-- 
Aleksey Gurtovoy
MetaCommunications Engineering