private PageAndSubIndex EnsureCurrentPage(int index)
{
var pageAndSubIndex = new PageAndSubIndex(index / _pageSize, index % _pageSize);
if (_currentPage == null || _currentPage.PageIndex != pageAndSubIndex.PageIndex)
{
_currentPage = _allocatedPages.GetOrCreatePage(pageAndSubIndex.PageIndex);
}
return(pageAndSubIndex);
}
protected override int GetKeyForItem(ISparsePage <TElement> item)
{
return(item.PageIndex);
}
