3.4.3 Specialized Lambda Lists

A specialized lambda list is used to specialize a method for a particular signature and to describe how arguments matching that signature are received by the method. The defined names in Figure 3–15 use specialized lambda lists in some way; see the dictionary entry for each for information about how.

  defmethod  defgeneric    

  Figure 3–15: Standardized Operators that use Specialized Lambda Lists

A specialized lambda list can contain the lambda list keywords shown in Figure 3–16.

  &allow-other-keys  &key       &rest  
  &aux               &optional         

  Figure 3–16: Lambda List Keywords used by Specialized Lambda Lists

A specialized lambda list is syntactically the same as an ordinary lambda list except that each required parameter may optionally be associated with a class or object for which that parameter is specialized.

lambda-list ::=({var | (var [specializer])}*  [&optional {var |   (var [init-form [supplied-p-parameter]])}*]  [&rest var]  [&key {var |     ({var |   (keyword-name var)}    [init-form [supplied-p-parameter]])}* [&allow-other-keys]]  [&aux {var | (var [init-form])}*])