Method Storage (SOS 1.9)

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### 4.2 Method Storage

Methods are stored in generic procedures. When a generic procedure is called, it selects a subset of its stored methods (using `method-applicable?`), and arranges to invoke one or more of the methods as necessary. The following definitions provide the means for adding methods to and removing them from a generic procedure.

Procedure: add-method generic-procedure method

  Adds method to generic-procedure. If generic-procedure already has a method with the same specializers as method, then the old method is discarded and method is used in its place.

Procedure: delete-method generic-procedure method

  Removes method from generic-procedure. Does nothing if generic-procedure does not contain method.

Procedure: add-methods generic-procedure methods

  Adds methods, which must be a list of methods, to generic-procedure. Equivalent to calling `add-method` on each method in methods.

Procedure: generic-procedure-methods generic-procedure

  Returns a list of the methods contained in generic-procedure. The returned list must not be modified.