Bits64.cs

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namespace Terraria.Utilities;
 
public struct Bits64
{
    private ulong v;
 
    public bool this[int i]
    {
        get
        {
            return (v & (ulong)(1L << i)) != 0;
        }
        set
        {
            if (value)
            {
                v |= (ulong)(1L << i);
            }
            else
            {
                v &= (ulong)(~(1L << i));
            }
        }
    }
 
    public bool IsEmpty => v == 0;
 
    public static implicit operator ulong(Bits64 b)
    {
        return b.v;
    }
 
    public static implicit operator Bits64(ulong v)
    {
        Bits64 result = default(Bits64);
        result.v = v;
        return result;
    }
}