/// <summary>
/// Append the specified value, commutatively - if you don't / haven't touched the
/// sequence in this transaction (using other methods/properties), this will not cause
/// conflicts! Effectively, the value is simply appended to whatever the sequence
/// is at commit time. Multiple calls to Append made in one transaction will
/// append the items in that order - they commute with other transactions only.
/// </summary>
public void Append(T val)
{
var newItem = new ItemKeeper(val, null, _owner);
Shield.EnlistCommute(() => {
if (_head.Value == null)
{
_head.Value = newItem;
_tail.Value = newItem;
}
else
{
_tail.Modify((ref ItemKeeper t) => {
t.Next.Value = newItem;
t = newItem;
});
}
}, _head, _tail); // the commute degenerates if you read from the seq..
}