add-method generic-function method → generic-function

generic-function — a generic function object.

method — a method object.

The generic function add-method adds a method to a generic function.

If method agrees with an existing method of generic-function on parameter specializers and qualifiers, the existing method is replaced.

The lambda list of the method function of method must be congruent with the lambda list of generic-function, or an error of type error is signaled.

If method is a method object of another generic function, an error of type error is signaled.

defmethod, defgeneric, find-method, remove-method, Section 7.6.3 (Agreement on Parameter Specializers and Qualifiers)