ContT
Related Docs:
class ContT
| package data
Build a computation that makes use of a callback, also known as a continuation.
Build a computation that makes use of a callback, also known as a continuation.
Example:
ContT.apply { callback =>
for {
a <- doFirstThing()
b <- doSecondThing(a)
c <- callback(b)
d <- doFourthThing(c)
} yield d
}
Similar to pure but evaluation of the argument is deferred.
Similar to pure but evaluation of the argument is deferred.
This is useful for building a computation which calls its continuation as the final step. Instead of writing:
ContT.apply { cb =>
val x = foo()
val y = bar(x)
val z = baz(y)
cb(z)
}you can write:
ContT.defer {
val x = foo()
val y = bar(x)
baz(y)
}
Similar to apply but evaluation of the argument is deferred.
Lift a pure value into ContT