class c4_Sequence
  A sequence is an abstract base class for views on ranges of records.

Public members
| c4_Sequence (); Abstract constructor
virtual int | Compare (int, c4_Cursor) const; Compare the specified row with another one
void | SetAt (int, c4_Cursor); Replace the contents of a specified row
virtual int | RemapIndex (int, const c4_Sequence*) const; Remap the index to an underlying view
const char* | Describe (); Return a descriptions of the current data structure
void | IncRef (); Increment the reference count of this sequence
void | DecRef (); Decrement the reference count, delete objects when last
int | NumRefs () const; Return the current number of references to this sequence
virtual int | Size () const; Return the current number of rows
void | Resize (int, int =-1); Change number of rows, either by inserting or removing them
virtual void | InsertAt (int, c4_Cursor, int =1); Insert one or more rows into this sequence
virtual void | RemoveAt (int, int =1); Remove one or more rows from this sequence
virtual void | Move (int, int); Move a row to another position
int | NthPropId (int) const; Return the id of the N-th property
int | PropIndex (int); Find the index of a property by its id
int | PropIndex (const c4_Property&); Find the index of a property, or create a new entry
virtual int | NumHandlers () const; Return the number of data handlers in this sequence
virtual c4_Handler& | NthHandler (int) const; Return a reference to the N-th handler in this sequence
virtual const c4_Sequence* | HandlerContext (int) const; Return the context of the N-th handler in this sequence
virtual int | AddHandler (c4_Handler*); Add the specified data handler to this sequence
virtual c4_Handler* | CreateHandler (const c4_Property&); Create a handler of the appropriate type
virtual int | ItemSize (int index_, int propId_); Return width of specified data item
virtual bool | Get (int, int, c4_Bytes&); Retrieve one data item from this sequence
virtual void | Set (int, const c4_Property&, const c4_Bytes&); Store a data item into this sequence
void | Attach (c4_Sequence* child_); Register a sequence to receive change notifications
void | Detach (c4_Sequence* child_); Unregister a sequence which received change notifications
c4_Dependencies* | GetDependencies () const; Return a pointer to the dependencies, or null
virtual c4_Notifier* | PreChange (c4_Notifier& nf_); Called just before a change is made to the sequence
virtual void | PostChange (c4_Notifier& nf_); Called after changes have been made to the sequence
const char* | UseTempBuffer (const char*);
virtual void | SetSize (int size_);
c4_Bytes& | Buffer (); Gives access to a general purpose temporary buffer

Protected members
int | _propertyLimit;
short* | _propertyMap;
c4_Bytes* | _tempBuf;
virtual | ~c4_Sequence ();
void | ClearCache ();

Header file | "mk4.h" -- Dec 9, 1999