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

From: Max Motovilov (max_at_[hidden])
Date: 2008-03-11 23:42:45

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 :(

I have attached a proof of concept implementation and a short test 
program. The code appears to compile and work with MSVC 2003 & 2008 and 
with GCC 4.2. It is not [yet] Boostified. My use case: I needed this 
adapter to write a dynamic dispatcher for a known set of template 
instances (poor man's dynamic template instantiation).

Regards,
...Max...