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eieio: CLOS compatibility

 
 18 CLOS compatibility
 *********************
 
 Currently, the following functions should behave almost as expected from
 CLOS.
 
 ‘defclass’
      All slot keywords are available but not all work correctly.  Slot
      keyword differences are:
 
      :reader, and :writer tags
           Create methods that signal errors instead of creating an
           unqualified method.  You can still create new ones to do its
           business.
 
      :accessor
           This should create an unqualified method to access a slot, but
           instead pre-builds a method that gets the slot’s value.
 
      :type
           Specifier uses the ‘typep’ function from the ‘cl’ package.
           (cl)Type Predicates.  It therefore has the same issues
           as that package.  Extensions include the ability to provide
           object names.
 
      defclass also supports class options, but does not currently use
      values of ‘:metaclass’, and ‘:default-initargs’.
 
 ‘make-instance’
      Make instance works as expected, however it just uses the EIEIO
      instance creator automatically generated when a new class is
      created.  Making New Objects.
 
 ‘defgeneric’
      Creates the desired symbol, and accepts all of the expected
      arguments except ‘:around’.
 
 ‘defmethod’
      Calls defgeneric, and accepts most of the expected arguments.  Only
      the first argument to the created method may have a type specifier.
      To type cast against a class, the class must exist before defmethod
      is called.  In addition, the ‘:around’ tag is not supported.
 
 ‘call-next-method’
      Inside a method, calls the next available method up the inheritance
      tree for the given object.  This is different than that found in
      CLOS because in EIEIO this function accepts replacement arguments.
      This permits subclasses to modify arguments as they are passed up
      the tree.  If no arguments are given, the expected CLOS behavior is
      used.
 
    CLOS supports the ‘describe’ command, but EIEIO provides support for
 using the standard ‘describe-function’ command on a constructor or
 generic function.
 
    When creating a new class (Building Classes) there are
 several new keywords supported by EIEIO.
 
    In EIEIO tags are in lower case, not mixed case.
 

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