/// <summary>
/// This handles creating the entry on first reference and removing the entry (and releasing on the value)
/// for the scope on last dereference.
/// </summary>
public ScopedReferenceEntry CreateOrUpdateItem(ScopedReferenceEntry oldItem, bool hasOldItem, out bool remove)
{
TValue value;
if (m_dereference)
{
Contract.Assert(hasOldItem, "Extraneous dereference detected. Ensure that scope is only disposed once");
// Check if dereferencing the last reference. If so, remove the item.
remove = oldItem.ReferenceCount == 1;
if (remove)
{
m_map.ReleaseValue(Key, oldItem.Value);
return(default(ScopedReferenceEntry));
}
value = oldItem.Value;
return(new ScopedReferenceEntry(Key, value, oldItem.ReferenceCount - 1));
}
else
{
remove = false;
value = hasOldItem ? oldItem.Value : m_map.CreateValue(Key);
return(new ScopedReferenceEntry(Key, value, oldItem.ReferenceCount + 1));
}
}
