On Sun, Jul 18, 2010 at 5:19 PM, Eitan Goldshtrom
Silly question, but I can't find the answer on the net. I think I'm just using the wrong words in my search. I'm looking for a way to create constant expressions in Haskell. The C/C++ equivalent of what I'm talking about is
#define NAME VALUE
I want an expression, or really just numbers for what I'm doing, that the compiler will put into the program at the designated places, instead of storing it in memory like a variable.
Unless you want to pattern match the value, just say myconst :: Double -- or anything else myconst = 7.14 {-# INLINE myconst #-} Voilà! This doesn't work for pattern matching, however, if you say f myconst = ... then 'myconst' will be the name of that argument that could be anything, and not just 7.14. You could, however, use CPP as well {-# LANGUAGE CPP #-} #define MYCONST 7.14 f MYCONST = ... but I'm against using CPP unless you need it. Cheers, -- Felipe.