Module: SingleForwardable
- Defined in:
- lib/forwardable.rb
Overview
Usage of The SingleForwardable is like Fowadable module.
Instance Method Summary collapse
-
#def_single_delegator(accessor, method, ali = method) ⇒ Object
(also: #def_delegator)
Defines a method method which delegates to obj (i.e. it calls the method of the same name in obj).
-
#def_single_delegators(accessor, *methods) ⇒ Object
(also: #def_delegators)
Shortcut for defining multiple delegator methods, but with no provision for using a different name.
-
#single_delegate(hash) ⇒ Object
(also: #delegate)
Takes a hash as its argument.
Instance Method Details
#def_single_delegator(accessor, method, ali = method) ⇒ Object Also known as: def_delegator
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.
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# File 'lib/forwardable.rb', line 267 def def_single_delegator(accessor, method, ali = method) str = %{ def #{ali}(*args, &block) begin #{accessor}.__send__(:#{method}, *args, &block) rescue Exception [email protected]_if{|s| %r"#{Regexp.quote(__FILE__)}"o =~ s} unless Forwardable::debug ::Kernel::raise end end } instance_eval(str, __FILE__, __LINE__) end |
#def_single_delegators(accessor, *methods) ⇒ Object Also known as: def_delegators
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
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# File 'lib/forwardable.rb', line 254 def def_single_delegators(accessor, *methods) methods.delete("__send__") methods.delete("__id__") for method in methods def_single_delegator(accessor, method) end end |
#single_delegate(hash) ⇒ Object Also known as: delegate
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.
:call-seq:
delegate method => accessor
delegate [method, method, ...] => accessor
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# File 'lib/forwardable.rb', line 234 def single_delegate(hash) hash.each{ |methods, accessor| methods = [methods] unless methods.respond_to?(:each) methods.each{ |method| def_single_delegator(accessor, method) } } end |