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MaybeBij :: Maybe Bij -> MaybeBijmappings Data.Bijection No documentation available.
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Defines MaybeLike typeclass - a generic way to look at some types as if they were Maybe It is currently used to add maybe-ness to unboxed primitive types in cases when it isn't possuble to just use `Maybe a` (e.g. unboxed arrays)
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monad-memo Data.MaybeLike An abstract interface to a type which may not have a value
module Control.Monad.Ology.Specific.
MaybeT No documentation available.
newtype
MaybeT (m :: Type -> Type) amonadology Control.Monad.Ology.Specific.MaybeT The parameterizable maybe monad, obtained by composing an arbitrary monad with the Maybe monad. Computations are actions that may produce a value or exit. The return function yields a computation that produces that value, while >>= sequences two subcomputations, exiting if either computation does.
MaybeT :: m (Maybe a) -> MaybeT (m :: Type -> Type) amonadology Control.Monad.Ology.Specific.MaybeT No documentation available.
module Opaleye.Internal.
MaybeFields No documentation available.
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opaleye Opaleye.Internal.MaybeFields The Opaleye analogue of Maybe. A value of type MaybeFields a either contains a value of type a, or it contains nothing.
MaybeFields :: Column SqlBool -> fields -> MaybeFields fieldsopaleye Opaleye.Internal.MaybeFields No documentation available.
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MaybeFields is Opaleye's analogue to Maybe. You probably won't want to create values of type MaybeFields directly; instead they will appear as the result of left/right/outer join-like operations, such as optionalRestrict and optional.