Re: [boost] Interest for a perl6-like-junctions-class?

From: FlSt_at_[hidden]
Date: 2005-07-26 15:17:46

Hello.

You can find a new version of my class to the sandbox file vault 
(flos_junction.zip). It implements some of the ideas from this 
discussion. But it's very inefficient, because it makes a lot of copies. 
I don't like the implementation, but it works and has the semantic I 
visualized.  Probaly I will need some help to make it more efficient.
I see junctions as a expressive way to write comparisons and aritmethic 
operations on lists and as a alternative to loops.
Furthermore I must note that Perls junctions are not limited to sets. 
Junctions are more general. They can be applied to any list and are a 
logical linkage between the elements of the list, which determines the 
result of a comparison. That's exactly what my class implements. There 
are now four classes: conjunction<T>, disjunction<T>, abjunction<T> and 
injunction<T>.  Whereas T is a Container-Type. And the Functions all_of, 
any_of, one_of, none_of create instances of this classes from a 
container. See the examples. There is a base class junction, becaus 
elsewise I don't know how to support all the operators and circumvent 
writing duplicate code (There are already a lot of macros ;-). Is there 
a better way?  

Sincerly
  Florian