Evaluate the computation and return an A value.
Evaluate the computation and return an A value.
For lazy instances (Later, Always), any necessary computation will be performed at this point. For eager instances (Now), a value will be immediately returned.
Ensure that the result of the computation (if any) will be memoized.
Ensure that the result of the computation (if any) will be memoized.
Practically, this means that when called on an Always[A] a Later[A] with an equivalent computation will be returned.
Lazily perform a computation based on an Eval[A], using the
function f to produce an Eval[B] given an A.
Lazily perform a computation based on an Eval[A], using the
function f to produce an Eval[B] given an A.
This call is stack-safe -- many .flatMap calls may be chained without consumed additional stack during evaluation. It is also written to avoid left-association problems, so that repeated calls to .flatMap will be efficiently applied.
Computation performed in f is always lazy, even when called on an eager (Now) instance.
Transform an Eval[A] into an Eval[B] given the transformation
function f.
Transform an Eval[A] into an Eval[B] given the transformation
function f.
This call is stack-safe -- many .map calls may be chained without consumed additional stack during evaluation.
Computation performed in f is always lazy, even when called on an eager (Now) instance.
Eval is a datatype, which controls evaluation.