contra-tracer
Safe HaskellSafe-Inferred
LanguageHaskell2010

Control.Tracer.Observe

Contents

Description

Functions useful for observing and measuring actions.

Synopsis

observing

data ObserveIndicator Source #

Constructors

ObserveBefore 
ObserveAfter 

Instances

Instances details
Show ObserveIndicator Source # 
Instance details

Defined in Control.Tracer.Observe

Methods

showsPrec :: Int -> ObserveIndicator -> ShowS Source #

show :: ObserveIndicator -> String Source #

showList :: [ObserveIndicator] -> ShowS Source #

data Observable s e d Source #

Constructors

OStart s 
OEnd e (Maybe d) 

matchObservations :: Monad m => m (Maybe s) -> (s -> m ()) -> (s -> e -> d) -> Tracer m (Observable s e d) -> Tracer m (Observable s e d) Source #