22 Aug
2003
22 Aug
'03
11:19 a.m.
On Fri, 22 Aug 2003 15:49:15 +0300, "Cagdas Ozgenc"
How do I emulate the "when" clause in ML for pattern matching? In other words when a pattern is matched (from a list of patterns of a function) and to enforce additional predicates I use guards, but if the guard condition is not satisfied I want Haskell to get back to trying the remaining patterns.
I may be confused about what you're asking for, but Haskell does this by default: foo (Left x) | x>3 = "bar" foo _ = "splat" Main> foo (Left 5) "bar" Main> foo (Left 1) "splat" Ganesh