Control.Eff.Example

Example usage of Control.Eff

Documentation

newtype TooBig

The datatype for the example from the paper. See the tests for the example

Constructors

TooBig Int

Instances

Eq TooBig

Methods

(==) :: TooBig -> TooBig -> Bool

(/=) :: TooBig -> TooBig -> Bool

Show TooBig

Methods

showsPrec :: Int -> TooBig -> ShowS

show :: TooBig -> String

showList :: [TooBig] -> ShowS

runErrBig :: Eff (Exc TooBig ': r) a -> Eff r (Either TooBig a)

specialization to tell the type of the exception

sum2 :: [Reader Int, Reader Float] <:: r => Eff r Float

Multiple Reader effects

writeAll :: Member (Writer a) e => [a] -> Eff e ()

Write the elements of a list of numbers, in order.

sumAll :: (Num a, Member (State a) e) => [a] -> Eff e ()

Add a list of numbers to the current state.

writeAndAdd :: ([Writer a, State a] <:: e, Num a) => [a] -> Eff e ()

Write a list of numbers and add them to the current state.

sumEff :: Num a => [a] -> a

Sum a list of numbers.

lastEff :: [a] -> Maybe a

Safely get the last element of a list. Nothing for empty lists; Just the last element otherwise.

lastAndSum :: Num a => [a] -> (Maybe a, a)

Get the last element and sum of a list

data Move x where

Constructors

Move :: Move ()

handUp :: Eff (Move ': r) a -> Eff r a

handDown :: Eff (Move ': r) a -> Eff r a