unamb-0.1.1: Unambiguous choiceSource codeContentsIndex
Unambiguous choice
bottom :: a
unamb :: a -> a -> a
assuming :: Bool -> a -> a
asAgree :: Eq a => a -> a -> a
hang :: a
amb :: a -> a -> IO a
race :: IO a -> IO a -> IO a
bottom :: aSource
A bottom value, allowing no information out. A left- and right- identity for unamb. At the top level, evaluating bottom results in the message Exception: thread blocked indefinitely.
unamb :: a -> a -> aSource
Unambiguous choice operator. Equivalent to the ambiguous choice operator, but with arguments restricted to be equal where not bottom, so that the choice doesn't matter. See also amb.
assuming :: Bool -> a -> aSource
Yield a value if a condition is true. Otherwise wait forever.
asAgree :: Eq a => a -> a -> aSource
The value of agreeing values (or hang)
hang :: aSource
Never yield an answer. Like undefined or 'error whatever', but don't raise an error, and don't consume computational resources.
amb :: a -> a -> IO aSource
Ambiguous choice operator. Yield either value. Evaluates in separate threads and picks whichever finishes first. See also unamb and race.
race :: IO a -> IO a -> IO aSource
Race two actions against each other in separate threads, and pick whichever finishes first. See also amb. Thanks to Spencer Janssen for this simple version.
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