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

From: Larry Evans (cppljevans_at_[hidden])
Date: 2008-03-12 07:10:10

On 03/11/08 22:42, Max Motovilov wrote:
[snip]
> I apologize in advance if something along these lines is already 
> available; however current public documentation doesn't mention such a 
> facility and a brief glance into SVN did not reveal one either...
> 
> product_view
> 
> Description: provides a view of a Cartesian product of multiple 
> sequences. Modeled after zip_view in that it expects a sequence [of 
> length n] of sequences S1...Sn as its argument and lazily generates a 
> sequence [of length Prod{1...n}( size< Si > )] of sequences 
> S1[1]...Sn[1] through S1[n]...Sn[n]. Whew... I know I can write better 
> documentation than that if I put my mind to it :(
> 
 From Prod[1..n}(size<Si>} it appears this just flattens a list 1 level.
IOW:
   from:
      list
      < list< A0_0, A0_1>
      , list< A1_0, A1_1>
      ...
      , list< An_0, An_1.
      >
   it produces:
      list
      < A0_0, A0_1
      , A1_0, A1_1
      ...
      , An_0, An_1
      >

Is that right?