FreeBSD Manual Pages
Tk_GetUid(3) Tk Library Procedures Tk_GetUid(3) ________________________________________________________________________________ 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 correspond- ing 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 (str- cmp(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 str- cmp. 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)
NAME | SYNOPSIS | ARGUMENTS | DESCRIPTION | KEYWORDS
Want to link to this manual page? Use this URL:
<https://man.freebsd.org/cgi/man.cgi?query=Tk_GetUid.tk86&sektion=3&manpath=FreeBSD+Ports+15.1.quarterly>