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Questions - coerce

True isomorphisms in Haskell

Are the following assertions true: The only real isomorphism, accessible programatically to the user, verified by Haskell type system, and that the Haskell compiler is/can be made aware of, is betwee...
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nicolas

haskell

isomorphism

coerce

derivingvia

Votes: 0

Answers: 1

Latest Answer

Look into Homotopy Type Theory/Cubical Agda where an "equality is isomorphism". I am not familiar enough with it to know what happens operationally, even if Agda knows isomorphic types are e...
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Iceland_jack

Can not deduce proper type when coercing newtype

I was trying to simplify my life with newtype with coerce, but I've encountered a quite painful problem when using it in certain scenario: import Data.Coerce (coerce) import Data.Foldable (toList) --...
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majkrzak

haskell

coerce

Votes: 0

Answers: 2

Latest Answer

The lens solution you may be looking for is in Control.Lens.Wrapped: {-# LANGUAGE DeriveGeneric, StandaloneDeriving #-} import Control.Lens import Control.Lens.Wrapped import GHC.Generics import Data...
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K. A. Buhr

Binding Slider.Value to property and setting Value to value above Slider.Maximum will coerce it to Maximum but the ViewModel will go out of sync

Before I start to explain my problem: The Slider is just an example for the following problem. I work on a custom control, that has to do a very similar thing like the slider does here: Scenario: I h...
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Jannik

wpf

data-binding

dependency-properties

coerce

Votes: 0

Answers: 1

Latest Answer

Bind the Maximum property of your Slider to another view model property and implement logic to ensure that your values are always within the valid range in your view model class. The control rightfull...
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mm8

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