Provides the geny.Gen data type, A Generator of elements of type A.
Generator is basically the inverse of
a scala.Iterator: instead of the core functionality being the pull-based
hasNext and next: T methods, the core is based around the push-based
generate method. generate is basically an extra-customizable version of
foreach, which allows the person calling it to provide basic control-flow
instructions to the upstream Gens.
Unlike a scala.Iterator, subclasses of Generator can guarantee any clean
up logic is performed by placing it after the generate call is made.
Transformations on a Generator are lazy: calling methods like filter
or map do not evaluate the entire Gen, but instead construct a new
Gen that delegates to the original. The only methods that evaluate
the Generator are the "Action" methods like
generate/foreach/find, or the "Conversion" methods like toArray or
generate takes a function returning Gen.Action rather that
Unit. This allows a downstream Gen to provide basic control
commands to the upstream Gens: i.e. Generator.End to cease
enumeration of the upstream Gen. This allows it to avoid traversing and
processing elements that the downstream Gen doesn't want/need to see