public override bool IsAlive()
{
if (target.IsAlive())
{
return(true);
}
return(false);
}
public override bool ContainsKey(K key)
{
_accessCounter++;
WeakReference <V> wv = _dict.TryGetValue(key, null);
if (wv != null)
{
if (wv.IsAlive())
{
return(true);
}
else
{
_dict.Remove(key);
}
}
return(false);
}
public override void Add(K key, V value)
{
_accessCounter += 4;
WeakReference <V> wv = _dict.TryGetValue(key, null);
if (wv != null)
{
if (wv.IsAlive() || wv == WeakNull)
{
throw new KeyAlreadyExistsException();
}
else if (value != null)
{
wv.SetTarget(value);
return;
}
}
_dict[key] = value == null ? WeakNull : new WeakReference <V>(value);
}
