Generic swap: Difference between revisions
Content added Content deleted
Jazzedpineda (talk | contribs) (Add Plain English) |
(→{{header|Kotlin}}: added another possible solution) |
||
| Line 1,691: | Line 1,691: | ||
=={{header|Kotlin}}== |
=={{header|Kotlin}}== |
||
As Kotlin does not support passing parameters by reference and tuples cannot be destructured automatically to pre-existing variables, it's just as easy to swap variable values 'inline' rather than using a function. However, here's one of way of doing it generically using the latter: |
As Kotlin does not support passing parameters by reference and tuples cannot be destructured automatically to pre-existing variables, it's just as easy to swap variable values 'inline' rather than using a function. However, here's one of way of doing it generically using the latter: |
||
<syntaxhighlight lang=" |
<syntaxhighlight lang="kotlin"> |
||
fun <T> swap(t1: T, t2: T) = Pair(t2, t1) |
fun <T> swap(t1: T, t2: T) = Pair(t2, t1) |
||
fun main( |
fun main() { |
||
var a = 3 |
var a = 3 |
||
var b = 4 |
var b = 4 |
||
| Line 1,719: | Line 1,718: | ||
e = false |
e = false |
||
</pre> |
</pre> |
||
You can also explicitly create a container class and swap the value that it contains (but this is a bad idea in practice): |
|||
<syntaxhighlight lang="kotlin"> |
|||
data class Ref<T>(var value: T) { |
|||
fun swap(other: Ref<T>) { |
|||
val tmp = this.value |
|||
this.value = other.value |
|||
other.value = tmp |
|||
} |
|||
override fun toString() = "$value" |
|||
} |
|||
|
|||
fun main() { |
|||
val a = Ref(1) |
|||
val b = Ref(2) |
|||
a.swap(b) |
|||
println(a) |
|||
println(b) |
|||
} |
|||
</syntaxhighlight> |
|||
=={{header|Lambdatalk}}== |
=={{header|Lambdatalk}}== |
||