public List <Mask2> Minus(Mask2 Other)
{
var builders = new List <StringBuilder>();
builders.Add(new StringBuilder());
for (var i = 0; i < MaskString.Length; i++)
{
if (MaskString[i] != 'X')
{
if (MaskString[i] != Other.MaskString[i] && Other.MaskString[i] != 'X')
{
// If there is ever a bit they differ on, then the subtraction removes nothing
return(new List <Mask2>()
{
this
});
}
foreach (var builder in builders)
{
builder.Append(MaskString[i]);
}
}
else
{
if (Other.MaskString[i] == 'X')
{
foreach (var builder in builders)
{
builder.Append('X');
}
}
else
{
for (var j = 0; j < builders.Count - 1; j++)
{
builders[j].Append('X');
}
builders.Add(new StringBuilder(builders[builders.Count - 1].ToString()));
builders[builders.Count - 2].Append(Other.MaskString[i] == '0' ? '1' : '0');
builders[builders.Count - 1].Append(Other.MaskString[i]);
}
}
}
// Discard the last entry as the other always includes it
builders.RemoveAt(builders.Count - 1);
return(builders.Select(builder => new Mask2(builder.ToString())).ToList());
}