Tools.h++ Class Reference

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©Copyright 1996 Rogue Wave Software
RWFileManager
RWFileManager RWFile
Synopsis●
Description●
Persistence●
Public Constructor●
Public Member Functions●
Synopsis
typedef long RWoffset ;
typedef unsigned long RWspace; // (typically)
#include <rw/filemgr.h>
RWFileManager f("file.dat");
Description
Class RWFileManager allocates and deallocates storage in a disk file, much like a "freestore"
manager. It does this by maintaining a linked list of free space within the file. Note: Class
RWFileManager inherits class RWFile as a public base class; hence all the public member
functions of RWFile are visible to RWFileManager. They are not listed here.
If a file is managed by an RWFileManager then reading or writing to unallocated space in the
file will have undefined results. In particular, overwriting the end of allocated space is a
common problem which usually results in corrupted data. One way to encounter this problem is
to use binaryStoreSize() to discover the amount of space needed to store an RWCollection. For
most purposes, the storage size of an RWCollection is found using the RWCollectable method
recursiveStoreSize().