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class C {
def methodLift1 = {
def isEven(c: Int) = c % 2 == 0
val f: Int => Boolean = isEven
f
}
def methodLift2 = {
def isEven(c: Int) = c % 2 == 0
def isEven0(c: Int) = isEven(c)
val f: Int => Boolean = isEven0
f
}
def methodLift3 = {
def isEven(c: Int) = {toString; c % 2 == 0}
def isEven0(c: Int) = isEven(c)
val f: Int => Boolean = isEven0
f
}
}
object Test {
def main(args: Array[String]): Unit = {
val c = new C
{
val f = c.methodLift1
assert(f(0))
assert(!f(1))
val f1 = serializeDeserialize(f)
assert(f1(0))
assert(!f1(1))
}
{
val f = c.methodLift2
assert(f(0))
assert(!f(1))
val f1 = serializeDeserialize(f)
assert(f1(0))
assert(!f1(1))
}
{
val f = c.methodLift3
assert(f(0))
assert(!f(1))
try {
serializeDeserialize(this)
assert(false)
} catch {
case _: java.io.NotSerializableException =>
// expected, the closure in methodLift3 must capture C which is not serializable
}
}
}
def serializeDeserialize[T <: AnyRef](obj: T): T = {
import java.io._
val buffer = new ByteArrayOutputStream
val out = new ObjectOutputStream(buffer)
out.writeObject(obj)
val in = new ObjectInputStream(new ByteArrayInputStream(buffer.toByteArray))
in.readObject.asInstanceOf[T]
}
}
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