[Boost-users] [fusion] for_each with indices

Subject: [Boost-users] [fusion] for_each with indices
From: Agustín K-ballo Bergé (kaballo86_at_[hidden])
Date: 2012-07-30 18:20:54

I recently needed to iterate over a fusion sequence, calling a function 
for each element that depends not only on the element type but on its 
index (position within the sequence) as well. I didn't find anything 
readily available to use in conjunction with for_each, so I ended up 
using fold with the index as state.

However, I would like to get the index as a compile time value. What 
would be the simpler/best way to do this? Creating an iterator adaptor 
that keeps track of advances to the base iterator (should I be using the 
iterator_facade extension mechanism)? Or perhaps zipping the sequence 
with some kind of infinite mpl::vector_c sequence?

Agustín K-ballo Bergé.-
http://fusionfenix.com