module SingleForwardable
SingleForwardable can be used to setup delegation at the object level as well.
printer = String.new printer.extend SingleForwardable # prepare object for delegation printer.def_delegator "STDOUT", "puts" # add delegation for STDOUT.puts() printer.puts "Howdy!"
Also, SingleForwardable can be used to set up delegation for a Class or Module.
class Implementation def self.service puts "serviced!" end end module Facade extend SingleForwardable def_delegator :Implementation, :service end Facade.service #=> serviced!
If you want to use both Forwardable and SingleForwardable, you can use methods def_instance_delegator and def_single_delegator, etc.
Public Instance Methods
# File vendor/bundle/ruby/4.0.0/gems/rbs-4.0.3/stdlib/forwardable/0/forwardable.rbs, line 263
def def_single_delegator: (interned accessor, Symbol method, ?Symbol ali) -> void
Defines a method method which delegates to accessor (i.e. it calls the method of the same name in accessor). If new_name is provided, it is used as the name for the delegate method. Returns the name of the method defined.
(interned accessor, *Symbol methods) → voidSource
# File vendor/bundle/ruby/4.0.0/gems/rbs-4.0.3/stdlib/forwardable/0/forwardable.rbs, line 246
def def_single_delegators: (interned accessor, *Symbol methods) -> void
Shortcut for defining multiple delegator methods, but with no provision for using a different name. The following two code samples have the same effect:
def_delegators :@records, :size, :<<, :map def_delegator :@records, :size def_delegator :@records, :<< def_delegator :@records, :map
# File vendor/bundle/ruby/4.0.0/gems/rbs-4.0.3/stdlib/forwardable/0/forwardable.rbs, line 224
def single_delegate: (Hash[Symbol | Array[Symbol], Symbol] hash) -> void
Takes a hash as its argument. The key is a symbol or an array of symbols. These symbols correspond to method names. The value is the accessor to which the methods will be delegated.