public IScalars Add(Scalar value)
{
value.VerifyNotNull(nameof(value));
if (Contains(value))
{
return(this);
}
if (!IsSealed)
{
_hashSet.Add(value);
return(this);
}
if (Count == 0)
{
return(value);
}
else
{
var result = new HashSetScalars();
foreach (var column in this)
{
result.Add(column);
}
result.Add(value);
return(result);
}
}
public IScalars Remove(Scalar value)
{
value.VerifyNotNull(nameof(value));
if (!Contains(value))
{
return(this);
}
if (Count == 1)
{
return(Empty);
}
if (Count == 2)
{
return(_hashSet.Single(x => x != value));
}
if (!IsSealed)
{
_hashSet.Remove(value);
return(this);
}
var result = new HashSetScalars();
foreach (var element in this)
{
if (element != value)
{
result.Add(element);
}
}
return(result);
}