IO Monad class hierarchy compatible with: io-sim, base, async, stm, exceptions & time packages. io-classes provides non-standard extensions distributed in public sublibraries io-classes:io-classes - the main library compatible with the above packages io-classes:strict-stm - strict STM API io-classes:strict-mvar - strict MVar API io-classes:si-timers - SI-unit based time / timers API, cancellable timers io-classes:mtl - MTL instances, some of which are experiemental Haddocks of all public sublibraries are published here.