Non reentrant iterator warning

[Divelix]

Why do I have non reentrant iterator warning from Android Studio even when I import ktx.collections.*?

[czyzby]

This is because LibGDX reuses iterators internally and might return the same instance on subsequent calls. It's basically an anti-pattern, which I'm guessing they implemented to limit the garbage collection on mobiles. See this StackOverflow thread.

[Divelix]

So is it safe for me to just ignore this warning then?

[czyzby]

@Divelix If you're not iterating over the same collection concurrently or within a nested loop, you should be fine. Just keep in mind that something like this could have unexpected results if the same iterator is used by each loop:

for ((enemy, enemyCount) in Data.matchHistory) {
  for ((enemy, enemyCount) in Data.matchHistory) {
    // ...
  }
}

For safety reasons alone, you might be better off using the maps from the standard library unless this is a performance-critical part of your application.