Tools.h++ Class Reference

Public Constructor
RWDiskPageHeap(const char* filename = 0,
unsigned nbufs = 10,
unsigned pgsize = 512);
Constructs a new disk-based page heap. The heap will use a file with filename filename,
otherwise it will negotiate with the operating system for a temporary filename. The number
of buffers, each the size of the page size, will be nbufs. No more than this many pages can
be locked at any one time. The size of each page is given by pgsize. To see whether a valid
RWDiskPageHeap has been constructed, call member function isValid().
Public Destructor
virtual
~RWDiskPageHeap();
Returns any resources used by the disk page heap back to the operating system. All pages
should have been deallocated before the destructor is called.
Public Member Functions
virtual RWHandle
allocate();
Redefined from class RWVirtualPageHeap. Allocates a page off the disk page heap and
returns a handle for it. If there is no more space (for example, the disk is full) then returns
zero.
virtual void
deallocate(RWHandle h);
Redefined from class RWBufferedPageHeap. Deallocate the page associated with handle
h. It is not an error to deallocate a zero handle.
virtual void
dirty(RWHandle h);
Inherited from RWBufferedPageHeap.
RWBoolean
isValid() const;
Returns TRUE if this is a valid RWDiskPageHeap.
virtual void*
lock(RWHandle h);
Inherited from RWBufferedPageHeap.
virtual void