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nx::next

Skip to the next most specific method implementation






next ?arguments?











  

  
This command is invoked inside a method body to call the next most
      specific method implementation in the list of available methods. This list
      of available methods is specific to the current method-call context. This
      context is set by the usage context of nx::next (method combination
      vs. method-call interception; see below). The optional arguments
      are the argument values to be passed into the next most specific method
      implementation. If omitted, the arguments of the current method call are
      automatically forwarded. To call the next most specific method
      implementation without arguments (or to suppress argument forwarding),
      arguments must be set to an empty string. To pass an empty string
      as a (single) argument value, protect it as a list. The result of a call
      to nx::next is the result of the next most specific method
      implementation. If there are no more further applicable methods, the
      result of nx::next will depend on its usage context: method
      combination or method-call interception. If nx::next is used in a
      method body for method combination, the result will be an empty string. If
      nx::next is used in the body of a filter method for method-call
      interception, the result will be an error.
    
When executing a method call, the NX dispatch mechanism
        computes a list of applicable method implementations for the method name
        requested from a given object receiving the call; in support of method
        combination and method-call interception.

    
For method combination, the computed list contains any
        object-local method implementation and any method implementations
        inherited by the object from the classes in its precedence list.
        Examples are overloading method implementations in the class hierarchy
        of the object, as well as from mixin classes of the object. For
        method-call interception, the computed list contains the
        applicable filter methods, again ordered by their definition order
        according to the precedence list of the called object.

    
To retrieve the next most specific method implementation to be
        invoked by nx::current from the internally computed list, if any,
        use nx::current.

  







Copyright (c) 2014-16 Stefan Sobernig <stefan.sobernig@wu.ac.at>, Gustaf Neumann <gustaf.neumann@wu.ac.at>