[boost] Re: An alternative typeof macro

From: Daniel James (daniel_at_[hidden])
Date: 2004-09-02 09:22:56

Arkadiy Vertleyb wrote:
> "Daniel James" <daniel_at_[hidden]> wrote
> 
> 
>>Using mpl views might be better. Currently the implementation works by
>>passing a list/vector to encode and adding to it. Instead encode could
>>just return the sequence for it's sub-type, which can then be combined
>>using mpl::joint_view, or similar.
> 
> 
> Note that push_back<mpl::vector<...> > requires just one template
> instantiation.  I am not sure why views are better.  And views definitely
> don't provide constant-time lookup.

I didn't mean to suggest that they're better in that regard. If the 
lookup time proves to be an obstacle, then the sequence can be copied 
into a mpl::vector, or Peder's compile time variables. The real 
advantage is losing the extra template parameter, which might not make 
much of a difference at all. But it might make the code a bit cleaner 
and more 'functional'.

It's probably not worth your time looking into it. But I might have a go 
when you release your next version (so I'm not working against a moving 
target). And I'd like to wait for the new version of mpl.

Daniel