IssueTracker

Component used: collection-ktx

Version used: 1.4.0

I need to use a memory efficient mutable map of Long to Pair<Int, Int>. A pair of 2 ints can be represented as a long, so I can use MutableLongLongMap for this.

Currently, I have to do this:

// putting an int pair
val map = buildMutableLongLongMap()

val firstValue = 1
val secondValue = 2
map[42L] = ((firstValue.toLong()) shl 32) or (secondValue.toLong() and 0xffffffffL)

// getting an int pair
val map = buildMutableLongLongMap()

val packedValue = map[42L]
val firstValue = (packedValue shr 32).toInt()
val secondValue = (packedValue and 0xFFFFFFFF).toInt()

Ideally I'd be able to leverage IntIntPair for this instead:

// putting an int pair
val map = buildMutableLongLongMap()

val firstValue = 1
val secondValue = 2
map[42L] = IntIntPair(firstValue, secondValue).packedValue

// getting an int pair
val map = buildMutableLongLongMap()

val (firstValue, secondValue) = IntIntPair(map[42L])

Unfortunately, I can't do that today because packedValue and IntIntPair(Long) are internal.

This isn't a huge blocker, but it sure would be nice :)

Note: this issue is similar to Generate collections for storing IntIntPair and FloatFloatPair but I don't think the library should generate the combinatorial of all possible collection types, it'd be nicer to allow combining the various pair types with the optimized primitive data structures.