public IAsyncEnumerator <int> GetAsyncEnumerator(CancellationToken cancellationToken = default)
{
CountAsyncEnumerable cae = Interlocked.CompareExchange(ref _state, StateStart, StateCtor) == StateCtor ?
this :
new CountAsyncEnumerable(_param_items)
{
_state = StateStart
};
cae._cancellationToken = cancellationToken;
return(cae);
}
public ValueTask <bool> MoveNextAsync()
{
_vts.Reset();
CountAsyncEnumerable inst = this;
_builder.MoveNext(ref inst); // invokes MoveNext, protected by ExecutionContext guards
switch (_vts.GetStatus(_vts.Version))
{
case ValueTaskSourceStatus.Succeeded:
return(new ValueTask <bool>(_vts.GetResult(_vts.Version)));
default:
return(new ValueTask <bool>(this, _vts.Version));
}
}