# COpenBuffer COpenBuffer is a class for simplified access to open prices of bars in the history. ### Description COpenBuffer class provides a simplified access to open prices of bars in the history. ### Declaration ```    class COpenBuffer: public CDoubleBuffer ``` ### Title ```    #include  ``` ``` Inheritance hierarchy   CObject       CArray           CArrayDouble               CDoubleBuffer                   COpenBuffer ``` ### Class Methods by Groups | Data Update | | | --- | --- | | virtual Refresh | Updates the buffer | | virtual RefreshCurrent | Updates the current value | | Methods inherited from class CObject Prev, Prev, Next, Next, Compare | | --- | | Methods inherited from class CArray Step , Step , Total , Available , Max , IsSorted , SortMode , Clear , Sort | | Methods inherited from class CArrayDouble Delta , Type , Save , Load , Reserve , Resize , Shutdown , Add , AddArray , AddArray , Insert , InsertArray , InsertArray , AssignArray , AssignArray , At , operator, Minimum , Maximum , Update , Shift , Delete , DeleteRange , CompareArray , CompareArray , InsertSort , Search , SearchGreat , SearchLess , SearchGreatOrEqual , SearchLessOrEqual , SearchFirst , SearchLast , SearchLinear | | Methods inherited from class CDoubleBuffer Size , At , SetSymbolPeriod |