CentOS 7.0 - man page for tk_uid (centos section 3)
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Tk_GetUid(3) Tk Library Procedures Tk_GetUid(3)
Tk_GetUid, Tk_Uid - convert from string to unique identifier
char *string (in) String for which the corresponding unique iden-
tifier is desired.
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 vari-
able 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).
atom, unique identifier
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