internal static bool TryCount <T, TSize>(IEnumerable <T> items, out TSize count)
where TSize : struct, IConvertible
{
IHive <T, TSize> hive = items as IHive <T, TSize>;
if (hive != null)
{
return(hive.TryGetCount(out count));
}
ICollection <T> collection = items as ICollection <T>;
int itemCount = collection != null
? collection.Count
: -1;
count = SizeOperations <TSize> .Default.From(itemCount);
return(itemCount >= 0);
}
protected override void OnInsertRange <TInputSize, TInput>
(Iterator position, IHive <T, TInputSize, TInput> range, out Range <T, TSize, Iterator> insertedRange)
{
TSize beginIndex = position.Key;
TSize endIndex;
TInputSize itemCount;
if (range.TryGetCount(out itemCount))
{
endIndex = Size.Add(beginIndex, Size.From <TInputSize>(itemCount));
EnsureSpaceExists(beginIndex, endIndex);
TSize targetIndex = beginIndex;
for (TInput i = range.Begin; !i.Equals(range.End); i.Increment())
{
Size.SetValueInArray(_innerArray, i.Read(), targetIndex);
Size.Increment(ref targetIndex);
}
}
else
{
StreamBuffer <T, TSize, TSizeOperations> snapshot =
StreamBuffer <T, TSize, TSizeOperations> .Create(range);
endIndex = Size.Add(beginIndex, snapshot.Count);
if (Size.Compare(snapshot.Count, Size.Zero) > 0)
{
EnsureSpaceExists(beginIndex, endIndex);
snapshot.CopyTo(_innerArray, beginIndex);
}
}
insertedRange = new Range <T, TSize, Iterator>(position, new Iterator(this, endIndex));
}