On Sat, Nov 17, 2007 at 04:01:34PM +0000, Andrew Coppin wrote:
Suppose I write something like this:
foo :: [Int] foo = concat (replicate 4 [4,7,2,9])
The value of "foo" is completely determined at compile-time. So, will the compiler generate calls to concat and replicate, or will it just insert a large list constant here?
Obviously, once somebody has completely examined the contents of "foo", after that point it won't matter either way. I'm just curiose. Concatinating some strings is cheap; I sometimes write constructs like the above using much more expensive operations. (Expensive in time; the space taken up by the result isn't that great.)
The compiler will generate calls to concat and replicate. Stefan, who is pretty sure he has a proposal for generalized folding pragmas Stefan