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| ANSI Common Lisp 22 Printer 22.4 Dictionary of Printer
22.4.3 pprint-dispatch | Function
  Syntax: pprint-dispatch object `&optional` table function, found-p Arguments and Values: object - an object. table - a pprint dispatch table, or nil. The default is the value of *print-pprint-dispatch*. function - a function designator. found-p - a generalized boolean. Description: Retrieves the highest priority function in table that is associated with a type specifier that matches object. The function is chosen by finding all of the type specifiers in table that match the object and selecting the highest priority function associated with any of these type specifiers. If there is more than one highest priority function, an arbitrary choice is made. If no type specifiers match the object, a function is returned that prints object using print-object. The secondary value, found-p, is true if a matching type specifier was found in table, or false otherwise. If table is nil, retrieval is done in the initial pprint dispatch table. Affected By: The state of the table. Exceptional Situations: Should signal an error of type type-error if table is neither a pprint-dispatch-table nor nil. Notes:
      (let ((*print-pretty* t))
        (write object :stream s))
      ==(funcall (pprint-dispatch object) s object)
Allegro CL Implementation Details: None.

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