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Tk_GetUid(3)		     Tk Library Procedures		  Tk_GetUid(3)

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NAME
       Tk_GetUid, Tk_Uid - convert from string to unique identifier

SYNOPSIS
       #include <tk.h>

       Tk_Uid
       Tk_GetUid(string)

ARGUMENTS
       char *string (in)			 String	 for  which the corre‐
						 sponding unique identifier is
						 desired.
_________________________________________________________________

DESCRIPTION
       Tk_GetUid  returns  the	unique	identifier  corresponding  to  string.
       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
       “char *” could be used.	However, there is guaranteed to be exactly one
       unique identifier for any given string value.  If Tk_GetUid  is	called
       twice,  once  with string a and once with string b, and if a and b have
       the same string value (strcmp(a, b) == 0), then Tk_GetUid  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  com‐
       pared  directly	(x  == y) without having to call strcmp.  In addition,
       the return value from Tk_GetUid will have the same string value as  its
       argument (strcmp(Tk_GetUid(a), a) == 0).

KEYWORDS
       atom, unique identifier

Tk								  Tk_GetUid(3)

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