CLHS: Constant Variable T

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Constant Variable T

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

Notes: None.

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