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| Control.Arrow.DeepArrow.Examples | | Portability | portable | | Stability | experimental | | Maintainer | conal@conal.net |
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| Description |
DeepArrow examples.
The types in the source code are formatted for easier reading.
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| Synopsis |
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| deep :: DeepArrow ~> => (c ~> c') -> (a -> (f, b -> (c, g)), e) ~> (a -> (f, b -> (c', g)), e) | | | extF :: DeepArrow ~> => (d ~> (c -> b)) -> (e -> (a, d), f) ~> (c -> (e -> (a, b), f)) | | | extFF :: DeepArrow ~> => (e -> (a, c -> b), f) ~> (c -> (e -> (a, b), f)) | | | extI :: DeepArrow ~> => (((a, (b, e)), c) -> d) ~> (b -> ((a, e), c) -> d) | | | extFI :: DeepArrow ~> => (e -> (g, ((a, (b, e)), c) -> d), f) ~> (b -> (e -> (g, ((a, e), c) -> d), f)) |
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| Deep application
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| deep :: DeepArrow ~> => (c ~> c') -> (a -> (f, b -> (c, g)), e) ~> (a -> (f, b -> (c', g)), e) | Source |
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Given a value of type (a -> (f,b -> (c,g)),e), apply a function to
just the c part and leave the rest intact.
deep = first . result . second . result . first |
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| Function extraction
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| extF :: DeepArrow ~> => (d ~> (c -> b)) -> (e -> (a, d), f) ~> (c -> (e -> (a, b), f)) | Source |
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Given a way to extract a function from a d value, create a way to
extract a function from a (e -> (a,d), f) value.
extF = funFirst . funResult . funSecond |
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| extFF :: DeepArrow ~> => (e -> (a, c -> b), f) ~> (c -> (e -> (a, b), f)) | Source |
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To make an extractor, simply apply the extractor-transformer extF
to the identity arrow.
extFF = extF idA |
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| Input extraction
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| extI :: DeepArrow ~> => (((a, (b, e)), c) -> d) ~> (b -> ((a, e), c) -> d) | Source |
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Extract a b input from a ((a,(b,e)),c) argument.
extI = (inpFirst . inpSecond) inpF |
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| extFI :: DeepArrow ~> => (e -> (g, ((a, (b, e)), c) -> d), f) ~> (b -> (e -> (g, ((a, e), c) -> d), f)) | Source |
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Typically, we will have to combine function and input extractors.
For instance, combine extF and extI.
extFI = extF extI |
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| Produced by Haddock version 2.3.0 |
