Re: [boost] [mpl] broken count and at metafunctions

From: David Abrahams (dave_at_[hidden])
Date: 2005-08-30 15:27:16

Matt Calabrese <rivorus_at_[hidden]> writes:

> Forgive me for posting three times in a row, but I just realized that the 
> reason why this conflict appears in the first place is because of the 
> difference between <algorithm> count and count as a member of associative 
> sequences in the STL. Since there is currently no distinction between these 
> two types of count in MPL, the conflict simply cannot be resolved (it is 
> conceivable that in certain cases you may wish to count by value_type 
> whereas sometimes you may wish to count by key_type, such as the STL allows, 
> so both forms of count should be useable for associative sequences). It 
> seems as though the only way to resolve this would be to have two 
> differently named counts, such as count and count_by_key appropriately.

I'm not ignoring you, but Aleksey is really responsible for most of
the implementation stuff so I'll leave it to him to respond.
-- 
Dave Abrahams
Boost Consulting
www.boost-consulting.com