internal static NativeArray <T> SubtractArrays <T>(NativeArray <T> minuend, NativeArray <T> subtrahend) where T : struct, IEquatable <T>
{
if (minuend.Length == 0 || minuend.ArraysEqual(subtrahend))
{
return(new NativeArray <T>(0, Allocator.Persistent));
}
if (subtrahend.Length == 0)
{
return(new NativeArray <T>(minuend, Allocator.Persistent));
}
var result = new NativeList <T>(Allocator.Temp);
result.AddRange(minuend);
foreach (var sub in subtrahend)
{
var i = result.IndexOf(sub);
if (i != -1)
{
result.RemoveAtSwapBack(i);
}
}
var asArray = new NativeArray <T>(result.AsArray(), Allocator.Persistent);
result.Dispose();
return(asArray);
}