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ANSI Common Lisp  5 Data and Control Flow 5.3 Dictionary of Data and Control Flow
| 5.3.32 t |
Constant Variable |
- Constant Value:
-
t.
- Description:
-
The boolean representing true,
and the canonical generalized boolean representing true.
Although any object
other than nil is considered true,
t is generally used when there is no special reason
to prefer one such object over another.
The symbol t is also sometimes used for other purposes as well.
For example,
as the name of a class,
as a designator (e.g., a stream designator)
or as a special symbol for some syntactic reason
(e.g., in case and typecase to label the otherwise-clause).
- Examples:
-
t  T
(eq t 't) true
(find-class 't) #<CLASS T 610703333>
(case 'a (a 1) (t 2)) 1
(case 'b (a 1) (t 2)) 2
(prin1 'hello t)
 HELLO
HELLO
- See Also:
-
nil
- Allegro CL Implementation Details:
-
None.
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