Re: [boost] Proposed: a new sequence adapter for MPL (product_view)

From: Steven Watanabe (watanabesj_at_[hidden])
Date: 2008-03-12 17:53:12

AMDG

Max Motovilov wrote:
> David Abrahams wrote:
>
>   
>> If the original posting there isn't a true crossproduct view, I would be
>> very grateful if you'd replace it with your own solution.
>>     
>
> I think we've settled that the solution to the book problem is a correct 
> crossproduct view for 2 sequences. Mine is set up to handle any number 
> of sequences from 0 to n but it is certainly bad illustrative material 
> as it's much more convoluted.
>   

The two are not the equivalent.  Given vector_c<int, 0, 1> and 
vector_c<int, 2, 3>
the book solution generates the equivalent of
vector<vector<pair<0, 2>, pair<0, 3> >, vector<pair<1, 2>, pair<1, 3> > >
while your solution flattens the result.

In Christ,
Steven Watanabe