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  corresponding  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 compared 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(3tk)