class c4_Sequence

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

Public:

c4_Sequence ();

Abstract constructor.

virtual int Compare (int, c4_Cursor) const;

Compares the specified row with another one.

void SetAt (int, c4_Cursor);

Replaces the contents of a specified row.

virtual int RemapIndex (int, const c4_Sequence*) const;

Remaps the index to an underlying view.

c4_String Describe () const;

Returns a descriptions of the current data structure.

void IncRef ();

Increments the reference count of this sequence.

void DecRef ();

Decrements the reference count, delete objects when last.

int NumRefs () const;

Returns the current number of references to this sequence.

virtual int Size () const;

Returns the current number of rows.

void Resize (int, int =-1);

Changes number of rows, either by inserting or removing them.

virtual void InsertAt (int, c4_Cursor, int =1);

Inserts one or more rows into this sequence.

virtual void RemoveAt (int, int =1);

Removes one or more rows from this sequence.

virtual void Move (int, int);

Move a row to another position.

int NthProperty (int) const;

Returns the id of the N-th property.

int PropIndex (int, bool =false);

Finds the index of a property, or creates a new entry.

virtual int NumHandlers () const;

Returns the number of data handlers in this sequence.

virtual c4_Handler& NthHandler (int) const;

Returns a reference to the N-th handler in this sequence.

virtual const c4_Sequence* HandlerContext (int) const;

Returns the context of the N-th handler in this sequence.

virtual int AddHandler (c4_Property&, c4_Handler*);

Adds the specified data handler to this sequence.

virtual bool Get (int, int, c4_Bytes&);

Retrieves one data item from this sequence.

virtual void Set (int, int, const c4_Bytes&);

Stores a data item into this sequence.

void Attach (c4_Sequence* child_);

Registers a sequence to receive change notifications.

void Detach (c4_Sequence* child_);

Unregisters a sequence which received change notifications.

c4_Dependencies* GetDependencies () const;

Returns 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.

virtual void SetSize (int size_);

Protected:

int _lastPropId;

see c4_HandlerSeq::Reset()

virtual ~c4_Sequence ();

#include "k4viewx.h"   // Jun 8, 1997