iterators and Collections

From: Bernard HUGUENEY (bernard.hugueney_at_[hidden])
Date: 2000-07-19 11:08:34

Hi,
I am an enthusiast user of LL ( pretty hard for me to get used to such simplicity compared to the clumsy std:: !!! ) and 
GGCL and have always been tired of using temporary tuples of ranges of iterators.

 I use a kind of Collection-like interface with collection_traits<> specialized for tuples and pair, default been for 
Containers. As I was always more than happy to thrash much of my home-brewed code for some code from the 
vault ( one day, oh yes, one day I will be able to contribute back :-) ), I wondered weither it could be standartized, or 
is it plain ugly ?

example:
instead of
... boring declaration of verticesBegin and verticesEnd
tie(verticesBegin, verticesEnd) = vertices(g);// or something else
for_each( verticesBegin, verticesEnd, do_something(free1));
we could have just
for_each( vertices(g), do_something(free1));

with
 template<typename CollectionType, typename Op> 
Op for_each(  const CollectionType & c, Op o){
           return for_each( collection_traits< CollectionType >::begin(c),
                                           collection_traits<CollectionType>::end(c),
                                           o);
}

Bernard