Tk_GetUid - Online Linux Manual Page

Section : 3
Updated :
Source : Tk
Note : Tk Library Procedures

NAMETk_GetUid, Tk_Uid − convert from string to unique identifier
SYNOPSIS#include <tk.h> Tk_Uid Tk_GetUid(string)
ARGUMENTS . el .TP 15   ​char *string (in) String for which the corresponding unique identifier is desired. .\}
DESCRIPTIONTk_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).
KEYWORDSatom, unique identifier 0
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