public R GetOrAdd(T key, Func <T, R> addFunc)
{
var res = dict.GetOrAdd(key, _ => NewRef(key, addFunc));
OnFinalise <R> target = null;
if (res.TryGetTarget(out target))
{
return(target.Value);
}
else
{
var upd = NewRef(key, addFunc);
res = dict.AddOrUpdate(key, upd, (_, __) => upd);
if (res.TryGetTarget(out target))
{
return(target.Value);
}
else
{
// This is a best guess of why the target can't be got.
// It might not be the best approach, perhaps a retry, or a
// better/more-descriptive exception.
throw new OutOfMemoryException();
}
}
}
public OptionUnsafe <R> TryGetValue(T key)
{
WeakReference <OnFinalise <R> > res = null;
OnFinalise <R> target = null;
return(dict.TryGetValue(key, out res)
? res.TryGetTarget(out target)
? SomeUnsafe(target.Value)
: None
: None);
}
