public IEnumerator <PeekElement <T> > GetEnumerator()
{
if (_walker != null)
{
var v = _walker;
_walker = null;
return(v);
}
else
{
return(new PeekWalker <T>(_source.GetEnumerator()));
}
}
public PeekWalkable(IEnumerable <T> source)
{
_source = source ?? throw new ArgumentNullException(nameof(source));
_walker = new PeekWalker <T>(_source.GetEnumerator());
}