[boost] Re: [MPL] Type detection

From: David B. Held (dheld_at_[hidden])
Date: 2003-10-24 14:22:33

"Joel de Guzman" <joel_at_[hidden]> wrote in message
news:007a01c39a19$cb730ac0$450caccb_at_godzilla...
> [...]
> Views *are* sequences. Conceptually a view has a begin
> and end (typically, but not always, an iterator pair).

Ok, thanks for the explanation.  That makes things clearer
(there really needs to be an MPL book, IMO, and probably
a Fusion one when it gets done).

> [...]
> Why is MPL being rewritten for tuples? It's like asking the
> question why was STL rewritten for meta-sequences
> (MPL)? Because these are two different domains. MPL
> deals with metafunctions, Fusion deals with polymorphic
> functions and metafunctions. MPL deals with types and
> constants purely at compile time. Fusion deals with types
> constants *and values* at compile time *and* at runtime.

And this makes a lot of sense too.  It's weird that there are
three different domains, one of them halfway between the
other two.  I would say that a perfect language would let
you collapse all three libraries together, since this is what
I might call "abstraction-level redundancy".  But I guess
having good libraries for each one is good enough for C++.

Dave

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