LongIterator
An iterator over a sequence of values of type Long
.
This is a substitute for Iterator<Long>
that provides a specialized version of next(): T
method: nextLong(): Long
and has a special handling by the compiler to avoid platform-specific boxing conversions as a performance optimization.
In the following example:
class LongContainer(private val data: LongArray) {
// LongIterator instead of Iterator<Long> in the signature
operator fun iterator(): LongIterator = object : LongIterator() {
private var idx = 0
override fun nextLong(): Long {
if (!hasNext()) throw NoSuchElementException()
return data[idx++]
}
override fun hasNext(): Boolean = idx < data.size
}
}
for (element in LongContainer(longArrayOf(1, 2, 3))) {
... handle element ...
}
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No boxing conversion is performed during the for-loop iteration. Note that the iterator itself will still be allocated.
Since Kotlin
1.0Functions
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Returns an Iterator that wraps each element produced by the original iterator into an IndexedValue containing the index of that element and the element itself.
Since Kotlin 1.0