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90 lines
3.5 KiB
Groff
90 lines
3.5 KiB
Groff
'\"
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'\" Copyright (c) 1995-1996 Sun Microsystems, Inc.
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'\"
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'\" See the file "license.terms" for information on usage and redistribution
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'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
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'\"
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'\"
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'\" SCCS: @(#) AssocData.3 1.8 96/03/25 19:56:17
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.so man.macros
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.TH Tcl_SetAssocData 3 7.5 Tcl "Tcl Library Procedures"
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.BS
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.SH NAME
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Tcl_GetAssocData, Tcl_SetAssocData, Tcl_DeleteAssocData \- manage
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associations of string keys and user specified data with Tcl
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interpreters.
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.SH SYNOPSIS
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.nf
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\fB#include <tcl.h>\fR
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.sp
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ClientData
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\fBTcl_GetAssocData\fR(\fIinterp, key, delProcPtr\fR)
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.sp
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\fBTcl_SetAssocData\fR(\fIinterp, key, delProc, clientData\fR)
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.sp
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\fBTcl_DeleteAssocData\fR(\fIinterp, key\fR)
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.SH ARGUMENTS
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.AS Tcl_InterpDeleteProc *delProcPtr
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.AP Tcl_Interp *interp in
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Interpreter in which to execute the specified command.
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.AP char *key in
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Key for association with which to store data or from which to delete or
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retrieve data. Typically the module prefix for a package.
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.AP Tcl_InterpDeleteProc *delProc in
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Procedure to call when \fIinterp\fR is deleted.
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.AP Tcl_InterpDeleteProc **delProcPtr in
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Pointer to location in which to store address of current deletion procedure
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for association. Ignored if NULL.
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.AP ClientData clientData in
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Arbitrary one-word value associated with the given key in this
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interpreter. This data is owned by the caller.
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.BE
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.SH DESCRIPTION
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.PP
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These procedures allow extensions to associate their own data with
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a Tcl interpreter.
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An association consists of a string key, typically the name of
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the extension, and a one-word value, which is typically a pointer
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to a data structure holding data specific to the extension.
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Tcl makes no interpretation of either the key or the value for
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an association.
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.PP
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Storage management is facilitated by storing with each association a
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procedure to call when the interpreter is deleted. This
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procedure can dispose of the storage occupied by the client's data in any
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way it sees fit.
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.PP
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\fBTcl_SetAssocData\fR creates an association between a string
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key and a user specified datum in the given interpreter.
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If there is already an association with the given \fIkey\fR,
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\fBTcl_SetAssocData\fR overwrites it with the new information.
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It is up to callers to organize their use of names to avoid conflicts,
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for example, by using package names as the keys.
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If the \fIdeleteProc\fR argument is non-NULL it specifies the address of a
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procedure to invoke if the interpreter is deleted before the association
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is deleted. \fIDeleteProc\fR should have arguments and result that match
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the type \fBTcl_InterpDeleteProc\fR:
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.CS
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typedef void Tcl_InterpDeleteProc(
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ClientData \fIclientData\fR,
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Tcl_Interp *\fIinterp\fR);
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.CE
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When \fIdeleteProc\fR is invoked the \fIclientData\fR and \fIinterp\fR
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arguments will be the same as the corresponding arguments passed to
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\fBTcl_SetAssocData\fR.
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The deletion procedure will \fInot\fR be invoked if the association
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is deleted before the interpreter is deleted.
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.PP
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\fBTcl_GetAssocData\fR returns the datum stored in the association with the
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specified key in the given interpreter, and if the \fIdelProcPtr\fR field
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is non-\fBNULL\fR, the address indicated by it gets the address of the
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delete procedure stored with this association. If no association with the
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specified key exists in the given interpreter \fBTcl_GetAssocData\fR
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returns \fBNULL\fR.
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.PP
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\fBTcl_DeleteAssocData\fR deletes an association with a specified key in
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the given interpreter. It does not call the deletion procedure.
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.SH KEYWORDS
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association, data, deletion procedure, interpreter, key
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