koobas.hobune.stream
ArgumentOutOfRangeException: Argument is out of range in Generic.List
I know this error has been asked many times but none of them seem to answer my problem.
TLDR: No problems at getting values from index but still getting ArgumentOutOfRangeException.
I have an object with the script Spawner. Spawner's Start will:
add 0 into a static List x times
add 1 into the same List x times
Instantiate an object (Pivot) and call a function Initialize from Pivot. This happens y times.
Pivot's Initialize will Instantiate a child (Node).
Node's Start will:
get a random index from Spawner's List.
get the value at that index
Debug.Log( value at index)
and removeAt the index.
In total I have 20 Nodes Instantiated. This error appears AFTER ALL the Debug.Logs are called. The error seems to come from value = listName[random index], yet I still got the values I needed (10 Nodes with 0 and 10 Nodes with 1)
ArgumentOutOfRangeException: Argument is out of range.
Parameter name: index
I found out what was the cause. It was a silly mistake on my part :)
I created 2X of nodes while still adding only X amount of things into the List.
The method List.RemoveAt(index) modifies the list, such that if there are 10 elements and you remove the first element, then the last index will be 8. If a Node has stored the index 9 (originally the last index) and calls RemoveAt(9) after another Node has called RemoveAt([0–9]), the index will be out of bounds.
Furthermore, if x < y, at least one index will be removed twice.
