[boost] some mpl programming task -- don't get this compiled

Subject: [boost] some mpl programming task -- don't get this compiled
From: Peter Foelsche (peter_foelsche_at_[hidden])
Date: 2009-06-16 17:31:11

I'm still unclear about some fundamentals of the mpl library.
Could somebody have a look at this source code?
I'm playing around with this since quite a while.
I'm trying to convert some information into an array of strings.
I'm using boost::mpl::map instead of vector as I want to overwrite points in 
a two dimensional matrix.
So in fact this is a map indexed by a long containing another map indexed by 
a long containing char. Two dimensional quadratic matrix of char.

Thanks
Peter