[Boost-users] boost::pp application

From: Marco Correia (mvc_at_[hidden])
Date: 2006-02-03 01:57:07

hi,

I would like to ask if there is a way boost::preprocessor may be used to solve 
the following problem:

The problem is to define a macro that expands to the concatenation of their 
arguments, without duplicates. The arguments are symbols belonging to a known 
alphabet.

For example, one possible solution for a macro which can take 3 symbols from 
the alphabet (A,B,C), would be

#define RemoveDuplicates(S1,S2,S3)      S1 ## S2 ## S3
#define AAA             A
#define AAB             AB
#define ABA             AB
#define ABB             AB
#define BAA             AB
#define BAB             AB
#define BBA             AB
#define BBB             B

In my real problem I have an alphabet of 10 symbols, which would be solved 
similarly with 10^10 #defines instructions, which is too much for the 
c++ preprocessor. So finally, is there any way boost::preprocessor can help me 
on this? And also, is there any paper or other document explaining how does 
boost::preprocessor works inside ? 

thanks
Marco

-- 
Marco Correia <mvc_at_[hidden]>