Memory layout of a data structure: Difference between revisions

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=={{header|Scala}}==

<lang Scala>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

}</lang>

=={{header|Tcl}}==

This Tcl implementation represents the fields as bits in an integer. It provides two functions to get from symbolic pin names to the integer, and vice versa.