trait Catchable[F[_]] extends AnyRef
A context in which exceptions can be caught and thrown.
This class places no other class constraints on F
, but it should be the
case that exceptions raised via fail
are caught by the nearest surrounding
attempt
and returned as a Left
. In addition to catching explicitly
raised exceptions via fail
, we expect that attempt
catch ambient
exceptions that might occur when 'evaluating' an F
.
We can state the requirement that attempt
catch all ambient exceptions
by stipulating that for all total functions of the form
g: forall A . F[Throwable \/ A] => B
, g compose attempt
is also
total.
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- Catchable[F]
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- Catchable.scala
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