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[eos/base.git] / util / src / TclTk / tk8.6.4 / doc / GetUid.3

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-'\"
-'\" Copyright (c) 1990 The Regents of the University of California.
-'\" Copyright (c) 1994-1996 Sun Microsystems, Inc.
-'\"
-'\" See the file "license.terms" for information on usage and redistribution
-'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
-'\" 
-.TH Tk_GetUid 3 "" Tk "Tk Library Procedures"
-.so man.macros
-.BS
-.SH NAME
-Tk_GetUid, Tk_Uid \- convert from string to unique identifier
-.SH SYNOPSIS
-.nf
-\fB#include <tk.h>\fR
-.sp
-Tk_Uid
-\fBTk_GetUid\fR(\fIstring\fR)
-.SH ARGUMENTS
-.AP char *string in
-String for which the corresponding unique identifier is
-desired.
-.BE
-.SH DESCRIPTION
-.PP
-\fBTk_GetUid\fR returns the unique identifier corresponding
-to \fIstring\fR.
-Unique identifiers are similar to atoms in Lisp, and are used
-in Tk to speed up comparisons and
-searches.  A unique identifier (type Tk_Uid) is a string pointer
-and may be used anywhere that a variable of type
-.QW "char *"
-could be used.  However, there is guaranteed to be exactly
-one unique identifier for any given string value.  If \fBTk_GetUid\fR
-is called twice, once with string \fIa\fR and once with string
-\fIb\fR, and if \fIa\fR and \fIb\fR have the same string value
-(strcmp(a, b) == 0), then \fBTk_GetUid\fR will return exactly
-the same Tk_Uid value for each call (Tk_GetUid(a) == Tk_GetUid(b)).
-This means that variables of type
-Tk_Uid may be compared directly (x == y) without having to call
-\fBstrcmp\fR.
-In addition, the return value from \fBTk_GetUid\fR will have the
-same string value as its argument (strcmp(Tk_GetUid(a), a) == 0).
-.SH KEYWORDS
-atom, unique identifier