if-instance
ifcxt
| if-instance | ifcxt | |
|---|---|---|
| 4 | 4 | |
| 28 | 110 | |
| - | - | |
| 3.6 | 0.0 | |
| 9 months ago | over 6 years ago | |
| Haskell | Haskell | |
| - | BSD 3-clause "New" or "Revised" License |
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if-instance
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Branching on constraints (if-instance), applications
Sam Derbyshire has a cool type-checking plugin called if-instance that lets you branch on whether a constraint is satisfied with the following interface:
- Different `Num` instances based on availability of another instance.
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How do I define this super-unsafe type class (not internally consistent at all 😱)
/u/presheaf has a more modern version using a GHC plugin: https://github.com/sheaf/if-instance
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Quantified, overlapping type family equations
I just put up a library that allows branching on whether a constraint is satisfied, using a type-checking plugin. There's also a type-family IsSat, which works as in the OP. Let me know what you think!
ifcxt
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Monthly Hask Anything (August 2022)
Even the IfCtx "tricks" and stuff like /u/Noughtmare's post don't resolve the constraints at runtime. The constraints are still resolved statically, you just carry around a (constant) token that indicates how compile-time resolution went.
- Different `Num` instances based on availability of another instance.
- How do I define this super-unsafe type class (not internally consistent at all 😱)
What are some alternatives?
capability - Extensional capabilities and deriving combinators
auto - Haskell DSL and platform providing denotational, compositional api for discrete-step, locally stateful, interactive programs, games & automations. http://hackage.haskell.org/package/auto
transient-universe - A Cloud monad based on transient for the creation of Web and reactive distributed applications that are fully composable, where Web browsers are first class nodes in the cloud
safe-exceptions - Safe, consistent, and easy exception handling
rio-orphans - A standard library for Haskell
objective - Purely functional objects
effect-monad - Provides 'graded monads' and 'parameterised monads' to Haskell, enabling fine-grained reasoning about effects.
xml-html-conduit-lens - Optics for xml-conduit and html-conduit
static-closure
cloud-haskell - This is an umbrella development repository for Cloud Haskell
selective - Selective Applicative Functors: Declare Your Effects Statically, Select Which to Execute Dynamically
freer-simple - A friendly effect system for Haskell