public async ValueTask <bool> MoveNextAsync()
{
for (; ;)
{
if (_once)
{
if (_queue.Dequeue(out _current))
{
return(true);
}
return(false);
}
while (await _source.MoveNextAsync())
{
if (_size != 0)
{
_size--;
}
else
{
_queue.Dequeue(out _);
}
_queue.Enqueue(_source.Current);
}
_once = true;
}
}
public async ValueTask <bool> MoveNextAsync()
{
while (_size != 0)
{
if (await _source.MoveNextAsync())
{
_queue.Enqueue(_source.Current);
_size--;
}
else
{
_size = 0;
return(false);
}
}
if (await _source.MoveNextAsync())
{
_queue.Dequeue(out _current);
_queue.Enqueue(_source.Current);
return(true);
}
return(false);
}
public async ValueTask <bool> MoveNextAsync()
{
for (; ;)
{
if (_done)
{
if (_buffers.Dequeue(out _buffer))
{
return(true);
}
return(false);
}
if (await _source.MoveNextAsync())
{
if (_index == 0)
{
_buffers.Enqueue(_bufferSupplier());
}
_index++;
_count++;
_buffers.ForEach(_source.Current, (b, v) => b.Add(v));
}
else
{
_done = true;
continue;
}
if (_index == _skip)
{
_index = 0;
}
if (_count == _size)
{
_count -= _skip;
_buffers.Dequeue(out _buffer);
return(true);
}
}
}