The open-typerep package

[Tags: bsd3, library]

This package uses Data Types à la Carte to provide open type representations and dynamic types/coercions for open type universes.

Example 1 (dynamic types):

 type MyUniverse = IntType :+: BoolType

 hlist :: [Dynamic MyUniverse]
 hlist = [toDyn True, toDyn (1 :: Int)]
 *Main> hlist

Note that if we were using Data.Dynamic, it would just print


Example 2 (dynamically typed addition):

 addDyn :: (TypeEq ts ts, PWitness Num ts ts) => Dynamic ts -> Dynamic ts -> Maybe (Dynamic ts)
 addDyn (Dyn ta a) (Dyn tb b) = do
     Dict <- typeEq ta tb
     Dict <- pwit pNum ta
     return (Dyn ta (a+b))

Data.Dynamic could only do this monomorphically, for one Num type at a time.


Versions0.1, 0.2
Dependenciesbase (==4.*), constraints (>=0.3), syntactic (>=2.0), tagged (>=0.4)
CopyrightCopyright (c) 2014, Emil Axelsson
AuthorEmil Axelsson
CategoryDependent Types
Home page
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Source repositoryhead: git clone
Upload dateMon Nov 17 08:04:02 UTC 2014
Uploaded byEmilAxelsson
Downloads110 total (42 in last 30 days)




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