groovy Groovy Truth (true-ness) Overriding boolean evaluation in a user defined class
Example
Sometimes it may be useful to have a specific asBoolean definition in your own program for some kind of objects.
/** an oversimplified robot controller */
class RunController {
def complexCondition
int position = 0
def asBoolean() {
return complexCondition(this);
}
def advanceTo(step) {
position += step
}
}
def runController = new RunController(complexCondition : { c -> c.position < 10 } )
assert runController
runController.advanceTo(5)
assert runController
runController.advanceTo(5)
// The limit has been reached : the controller evaluates to false
assert !runController
This code shows an oversimplifed robot controller who checks that the position of the robot does not exceeds 10 (with a closure for condition evaluation)
