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