Data.Metrics.Counter

An incrementing and decrementing counter metric

 import Data.Metrics.Counter

 main :: IO ()
 main = do
   c <- counter
   increment c
   x <- value c
   print $ x == 1

Documentation

data Counter m

A basic atomic counter.

Instances

PrimMonad m => Clear m (Counter m)

PrimMonad m => Count m (Counter m)

PrimMonad m => Set m (Counter m) Int

PrimMonad m => Value m (Counter m) Int

Register (Counter IO)

counter :: (Functor m, PrimMonad m) => m (Counter m)

Create a new counter.

increment :: PrimMonad m => Counter m -> m ()

Bump up a counter by 1.

increment' :: PrimMonad m => Counter m -> Int -> m ()

Add an arbitrary amount to a counter.

decrement :: PrimMonad m => Counter m -> m ()

Decrease the value of a counter by 1.

decrement' :: PrimMonad m => Counter m -> Int -> m ()

Subtract an arbitrary amount from a counter.

module Data.Metrics.Types