Memory layout of a data structure: Difference between revisions

=={{header|Kotlin}}==

If it were only desired to access pin settings by position (albeit starting from pin 0 rather than pin 1), then a java.util.BitSet could be used to model this task.

However, if access by both position and name is required, then a data class with 9 named boolean properties would be more suitable. This automatically generates functions called component1, component2 etc. to get the pin values by pin number. However, a function needs to be written manually to set pin values by pin number:

<lang scala>// version 1.0.6

const val OFF = false

const val ON = true

fun toOnOff(b: Boolean) = if (b) "ON" else "OFF"

data 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

) {

fun setPin(n: Int, v: Boolean) {

when (n) {

1 -> carrierDetect = v

2 -> receivedData = v

3 -> transmittedData = v

4 -> dataTerminalReady = v

5 -> signalGround = v

6 -> dataSetReady = v

7 -> requestToSend = v

8 -> clearToSend = v

9 -> ringIndicator = v

}

}

}

fun main(args: Array<String>) {

val plug = Rs232Pins9(carrierDetect = ON, receivedData = ON) // set first two pins, say

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>

{{out}}

<pre>

ON

ON

ON

OFF

</pre>