[Crossfire-wiki] [Crossfire DokuWiki] page changed: dev:objects

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Date        : 2007/03/22 08:19
User        : ryo
Edit Summary: merge shared strings to dev:shared_string

@@ -1821,38 +1821,19 @@
  6) Update other areas of the code that you presumably know about that will use these
     flag values.
  
  7) As appropriate, update the arch files and rebuild.
+ 
  
  
  ====== Programming notes ======
  
  This section provides some specific programming notes about objects.  If
  you don't actually work with the C code, there is no need to read this section.
  
- Basically, all the char* pointers in the object structure use a shared
- string library.  Using shared strings saves memory and improved performance.
- 
- To use the share string library, it is as simple as calling add_string(char
- *cp), where *cp is the pointer to the string you want to add.  You can pass
- defined strings also.  The function the finds the string, if it exists,
- increases the referecne count, and returns a pointer to the existing string.
- If the string does not exist in the table, it allocates space for it, copies
- the data into the space, and returns that new pointer.
- 
- free_string should be called to free these strings.
- 
- strdup and free should never be used on these shared strings.
+ Almost all the char* pointers in the object structure use a shared
+ string library. See [[shared_strings]] for more details. 
  
  When copying objects, the copy_object routine should always be used.  It will
  add reference counts to the copied strings.
  
- Because shared strings will return a pointer to a string if it
- exists, one can see if the strings are equal by comparing the shared
- string address they point to.
- 
- Shared string data should never be modified by any means - eg,
- strcpy(op->name, "new value") will update all the objects that use the same
- shared string as op does for its name.  Even without shared strings, this
- should never be done, because you can not be sure of the space allocation for
- op->name is long enough.
- 
+ Shared string data should never be modified by any means - eg, strcpy(op->name, "new value") will update all the objects that use the same shared string as op does for its name.


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Old Revision: http://wiki.metalforge.net/doku.php/dev:objects?rev=1174565240
New Revision: http://wiki.metalforge.net/doku.php/dev:objects

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