scala.util.boundary
A boundary that can be exited by break calls. boundary and break represent a unified and superior alternative for the scala.util.control.NonLocalReturns and scala.util.control.Breaks APIs. The main differences are:
boundary to establish a scope, break to leave it. break can optionally return a value.breaks are logically non-fatal exceptions. The Break exception class extends RuntimeException and is optimized so that stack trace generation is suppressed.Example usage:
import scala.util.boundary, boundary.break
def firstIndex[T](xs: List[T], elem: T): Int =
boundary:
for (x, i) <- xs.zipWithIndex do
if x == elem then break(i)
-1
User code should call break.apply instead of throwing this exception directly.
User code should call break.apply instead of throwing this exception directly.
Labels are targets indicating which boundary will be exited by a break.
Labels are targets indicating which boundary will be exited by a break.
Run body with freshly generated label as implicit argument. Catch any breaks associated with that label and return their results instead of body's result.
Run body with freshly generated label as implicit argument. Catch any breaks associated with that label and return their results instead of body's result.
Abort current computation and instead return value as the value of the enclosing boundary call that created label.
Abort current computation and instead return value as the value of the enclosing boundary call that created label.
Abort current computation and instead continue after the boundary call that created label.
Abort current computation and instead continue after the boundary call that created label.
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