Usage of The SingleForwardable is like Fowadable module.
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.
# File forwardable.rb, line 248 def def_single_delegator(accessor, method, ali = method) line_no = __LINE__; str = %{ def #{ali}(*args, &block) begin #{accessor}.__send__(:#{method}, *args, &block) rescue Exception $@.delete_if{|s| %r"#{Regexp.quote(__FILE__)}"o =~ s} unless Forwardable::debug ::Kernel::raise end end } instance_eval(str, __FILE__, __LINE__) end
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 forwardable.rb, line 235 def def_single_delegators(accessor, *methods) methods.delete("__send__") methods.delete("__id__") for method in methods def_single_delegator(accessor, method) end end
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.
# File forwardable.rb, line 215 def single_delegate(hash) hash.each{ |methods, accessor| methods = methods.to_s unless methods.respond_to?(:each) methods.each{ |method| def_single_delegator(accessor, method) } } end