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GHC 10.0.0.20260917 · lts/ghc-10.0.x · 8fef28d · 2026-11-02

Moduleselective-0.7.0.1Haskell2010

Control.Selective.Rigid.Freer

This is a library for selective applicative functors, or just selective functors for short, an abstraction between applicative functors and monads, introduced in this paper: https://dl.acm.org/doi/10.1145/3341694.

This module defines freer rigid selective functors. Rigid selective functors are those that satisfy the property <*> = apS. Compared to the "free" construction from Control.Selective.Rigid.Free, this "freer" construction does not require the underlying base data type to be a functor.

Contents
  1. Free rigid selective functors
  2. Static analysis
Synopsis

Free rigid selective functors

Static analysis

valuegetEffects :: Functor f => Select f a -> [f ()]

Collect all possible effects in the order they appear in a free selective computation.

valuegetNecessaryEffect :: Functor f => Select f a -> Maybe (f ())

Extract the necessary effect from a free selective computation. Note: there can be at most one effect that is statically guaranteed to be necessary.

valuerunSelect :: Selective g => (forall x. f x -> g x) -> Select f a -> g a

Given a natural transformation from f to g, this gives a canonical natural transformation from Select f to g.