How to wrap around values (using `mod`) when using get/set for array values?

Question

NOTICE: I do not want do wrap the index of the array, in fact, I already did that. I also want to wrap the individual values of the array when they are set.

I am trying to get array values to automatically wrap around without using a for loop to do it, because I have a fairly large array (uint16 limit).

I was trying to use a get/set and use a simple wrap code if it is above the max or below the minimum.

Is there any way I can do this?

What I want:

MyArray[0] = 5

//MyArray's max is 3, and minimum is 0

Outcome: MyArray[0] = 2

The problem is not looping around indices, but instead to have the values reduced to a limited range.

I've seen how to implement indexer - like Example of Indexer and how to clamp value - Where can I find the "clamp" function in .NET? (some even were suggested as duplicates).

@AlexeiLevenkov that works on the indexes. OP wants the values mod 5 — pm100, Feb 01 '22 at 00:06
i think you will have to create a wrapper around an array and overload the indexer function — pm100, Feb 01 '22 at 00:08
@AlexeiLevenkov no problem, I just want to solve this as quick as possible and I'm willing to do whatever it takes. — Vinny, Feb 01 '22 at 00:12
@AlexeiLevenkov it´s also clearly not about clamping as a value of 5 would be converted to 2. — rewritten, Feb 01 '22 at 00:12
@AlexeiLevenkov Actually, I'm using my own set method to wrap them! I am currently integrating these answers now, and although I do believe it is a bit hacky, it will work. Thanks for your concern! — Vinny, Feb 01 '22 at 00:32

score 2 · Accepted Answer · answered Feb 01 '22 at 00:17

this help?

using System;
public class ModArray
{
    int [] _array;
    int _mod;
    public ModArray(int size, int mod){
        _array = new int[size];
        _mod = mod;
    }
    public int this[int index]
    {
        get => _array[index];
        set => _array[index] = value % _mod;
    }
}
public class Test
{
    public static void Main()
    {
        var ma = new ModArray(10,3);
        ma[0] = 5;
        Console.WriteLine(ma[0]);
        }
}

score 0 · Answer 2 · answered Feb 01 '22 at 00:19

If you can change the way you set the values, you can just use the remainder operator (it should be like MyArray[0] = 5 % 3).

But if you can't, you will have to wrap your array in a class (as you cannot subclass arrays) similar to this:

class MyArray
{
   // Declare an array to store the data elements.
   private uint16[] arr = new uint16[100];

   // Define the indexer to allow client code to use [] notation.
   public uint16 this[int i]
   {
      get { return arr[i]; }
      set { arr[i] = value % 5; }
   }
}

How to wrap around values (using `mod`) when using get/set for array values?

2 Answers2