A generic page view: any Zero page can be viewed as being of this type but it only exposes fields shared by all Zero pages. To "downcast" and access page-type–specific fields, pass a pointer to one of these to one of the page handle classes' (e.g., btree_page_h) constructors. More...
#include <generic_page.h>
Private Attributes | |
| char | subclass_specific [page_sz - sizeof(generic_page_header)] |
Additional Inherited Members | |
 Public Member Functions inherited from generic_page_header | |
| uint32_t | calculate_checksum () const |
| Calculate the correct value of checksum for this page. More... | |
| Public Attributes inherited from generic_page_header | |
| uint32_t | checksum |
| Stored checksum of this page. More... | |
| PageID | pid |
| ID of this page. More... | |
| lsn_t | lsn |
| LSN (Log Sequence Number) of the last write to this page. More... | |
| StoreID | store |
| ID of the store to which this page belongs (0 if none) More... | |
| uint16_t | tag |
| Page type (a page_tag_t) More... | |
| Static Public Attributes inherited from generic_page_header | |
| static const size_t | page_sz = SM_PAGESIZE |
| Size of all Zero pages. More... | |
| Protected Attributes inherited from generic_page_header | |
| uint16_t | page_flags |
| Page flags (an OR of page_flag_t's) More... | |
| uint64_t | reserved |
| Reserved for subclass usage. More... | |
Detailed Description
A generic page view: any Zero page can be viewed as being of this type but it only exposes fields shared by all Zero pages. To "downcast" and access page-type–specific fields, pass a pointer to one of these to one of the page handle classes' (e.g., btree_page_h) constructors.
All zero pages have the same size and initial headers (generic_page_header's). Each specific page type has an associated data type that is a (indirect) subclass of generic_page_header as well as an associated handle class. For example, B-tree pages have associated page class btree_page and handle class btree_page_h. Casting between page types is done by the handle classes after verifying the cast is safe according to the page tag. No other code should perform such casts.
The corresponding handle class for this page type is generic_page_h.
Member Data Documentation
§ subclass_specific
|
private |
The documentation for this class was generated from the following file:
- src/sm/generic_page.h
