June 2018 Update

Task/Memory-layout-of-a-data-structure/Julia/memory-layout-of-a-data-structure.julia

@@ -0,0 +1,23 @@
+mutable struct NinePinSerialPort
+    pins::BitArray
+    function NinePinSerialPort()
+        this = new()
+        this.pins = BitArray(9)
+    end
+end
+
+const CD = 1
+const RD = 2
+const TD = 3
+const SG = 5
+const DSR = 6
+const RTS = 7
+const CTS = 8
+
+# Here we test the type's code.
+port = NinePinSerialPort()
+println("Port is now at defaults, which are $port")
+port[CTS] = true
+println("CD pin of port, which is pin $CD, is now $(port[CD])")
+println("CTS pin of port, which is pin $CTS, is now $(port[CTS])")
+println("port is now: $port")

Task/Memory-layout-of-a-data-structure/Scala/memory-layout-of-a-data-structure.scala

@@ -0,0 +1,40 @@
+object Rs232Pins9 extends App {
+
+  val (off: Boolean, on: Boolean) = (false, true)
+  val plug = new Rs232Pins9(carrierDetect = on, receivedData = on) // set first two pins, say
+
+  def toOnOff(b: Boolean) = if (b) "on" else "off"
+
+  class Rs232Pins9(
+                    var carrierDetect: Boolean = off,
+                    var receivedData: Boolean = off,
+                    var transmittedData: Boolean = off,
+                    var dataTerminalReady: Boolean = off,
+                    var signalGround: Boolean = off,
+                    var dataSetReady: Boolean = off,
+                    var requestToSend: Boolean = off,
+                    var clearToSend: Boolean = off,
+                    var ringIndicator: Boolean = off
+                  ) {
+    def setPin(n: Int, v: Boolean) {
+      (n) match {
+        case 1 => carrierDetect = v
+        case 2 => receivedData = v
+        case 3 => transmittedData = v
+        case 4 => dataTerminalReady = v
+        case 5 => signalGround = v
+        case 6 => dataSetReady = v
+        case 7 => requestToSend = v
+        case 8 => clearToSend = v
+        case 9 => ringIndicator = v
+      }
+    }
+  }
+
+  // println(toOnOff(plug.component2()))                          // print value of pin 2 by number
+  plug.transmittedData = on // set pin 3 by name
+  plug.setPin(4, on) // set pin 4 by number
+  // println(toOnOff(plug.component3()))                          // print value of pin 3 by number
+  println(toOnOff(plug.dataTerminalReady)) // print value of pin 4 by name
+  println(toOnOff(plug.ringIndicator)) // print value of pin 9 by name
+}