Module: SingleForwardable

Module | SingleForwardable
In: | forwardable.rb

The SingleForwardable module provides delegation of specified methods to a designated object, using the methods def_delegator and def_delegators. This module is similar to Forwardable, but it works on objects themselves, instead of their defining classes.

Also see the example at forwardable.rb.

### Methods

def_delegator def_delegators def_singleton_delegator def_singleton_delegators

### Public Instance methods

def_delegator(accessor, method, ali = method)

Alias for def_singleton_delegator

def_delegators(accessor, *methods)

Alias for def_singleton_delegators

def_singleton_delegator(accessor, method, ali = method)

Defines a method method which delegates to obj (i.e. it calls the method of the same name in obj). If new_name is provided, it is used as the name for the delegate method.

See the example at forwardable.rb.

[Source]

    # File forwardable.rb, line 200
      def def_singleton_delegator(accessor, method, ali = method)
        accessor = accessor.id2name if accessor.kind_of?(Integer)
        method = method.id2name if method.kind_of?(Integer)
        ali = ali.id2name if ali.kind_of?(Integer)

        instance_eval("def \#{ali}(*args, &block)\nbegin\n\#{accessor}.__send__(:\#{method}, *args,&block)\nrescue Exception\n$@.delete_if{|s| /^\\\\(__FORWARDABLE__\\\\):/ =~ s} unless Forwardable::debug\nKernel::raise\nend\nend\n", "(__FORWARDABLE__)", 1)
      end

def_singleton_delegators(accessor, *methods)

Shortcut for defining multiple delegator methods, but with no provision for using a different name. The following two code samples have the same effect:

      single_forwardable.def_delegators :@records, :size, :<<, :map

      single_forwardable.def_delegator :@records, :size
      single_forwardable.def_delegator :@records, :<<
      single_forwardable.def_delegator :@records, :map

See the example at forwardable.rb.

[Source]

    # File forwardable.rb, line 187
      def def_singleton_delegators(accessor, *methods)
        for method in methods
          def_singleton_delegator(accessor, method)
        end
      end

[Validate]