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OpenDarwin 7.2.1 - man page for tcl_setassocdata (opendarwin section 3)

Tcl_SetAssocData(3)		      Tcl Library Procedures		      Tcl_SetAssocData(3)


       Tcl_GetAssocData,  Tcl_SetAssocData,  Tcl_DeleteAssocData  - manage associations of string
       keys and user specified data with Tcl interpreters.

       #include <tcl.h>

       Tcl_GetAssocData(interp, key, delProcPtr)

       Tcl_SetAssocData(interp, key, delProc, clientData)

       Tcl_DeleteAssocData(interp, key)

       Tcl_Interp	      *interp	    (in)      Interpreter in which to execute the  speci-
						      fied command.				  |

       CONST char	      *key	    (in)						  |
						      Key  for	association  with  which to store
						      data or from which to  delete  or  retrieve
						      data.   Typically  the  module prefix for a

       Tcl_InterpDeleteProc   *delProc	    (in)      Procedure to call when interp is deleted.

       Tcl_InterpDeleteProc   **delProcPtr  (in)      Pointer  to  location  in  which	to  store
						      address  of  current deletion procedure for
						      association.  Ignored if NULL.

       ClientData	      clientData    (in)      Arbitrary one-word  value  associated  with
						      the  given  key  in this interpreter.  This
						      data is owned by the caller.

       These procedures allow extensions to associate their own data with a Tcl interpreter.   An
       association  consists of a string key, typically the name of the extension, and a one-word
       value, which is typically a pointer to a data  structure  holding  data	specific  to  the
       extension.  Tcl makes no interpretation of either the key or the value for an association.

       Storage	management  is	facilitated  by storing with each association a procedure to call
       when the interpreter is deleted. This procedure can dispose of the storage occupied by the
       client's data in any way it sees fit.

       Tcl_SetAssocData creates an association between a string key and a user specified datum in
       the given interpreter.  If there is already an association with the given key,  Tcl_SetAs-
       socData overwrites it with the new information.	It is up to callers to organize their use
       of names to avoid conflicts, for example, by using package names  as  the  keys.   If  the
       deleteProc  argument  is non-NULL it specifies the address of a procedure to invoke if the
       interpreter is deleted before the association is deleted.  DeleteProc  should  have  argu-
       ments and result that match the type Tcl_InterpDeleteProc:
	      typedef void Tcl_InterpDeleteProc(
		ClientData clientData,
		Tcl_Interp *interp);
       When  deleteProc  is  invoked  the clientData and interp arguments will be the same as the
       corresponding arguments passed to Tcl_SetAssocData.  The deletion procedure  will  not  be
       invoked if the association is deleted before the interpreter is deleted.

       Tcl_GetAssocData returns the datum stored in the association with the specified key in the
       given interpreter, and if the delProcPtr field is non-NULL, the address	indicated  by  it
       gets  the  address of the delete procedure stored with this association. If no association
       with the specified key exists in the given interpreter Tcl_GetAssocData returns NULL.

       Tcl_DeleteAssocData deletes an association with a specified key in the given  interpreter.
       Then it calls the deletion procedure.

       association, data, deletion procedure, interpreter, key

Tcl					       7.5			      Tcl_SetAssocData(3)

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