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Contents
class Module
# Automatically create an initializer assigning the given
# arguments.
#
# class MyClass
# initializer(:a, "b", :c)
# end
#
# _is equivalent to_
#
# class MyClass
# def initialize(a, b, c)
# @a,@b,@c = a,b,c
# end
# end
#
# Downside: Initializers defined like this can't take blocks.
# This can be fixed when Ruby 1.9 is out.
#
# The initializer will not raise an Exception when the user
# does not supply a value for each instance variable. In that
# case it will just set the instance variable to nil. You can
# assign default values or raise an Exception in the block.
#
def initializer(*attributes, &block)
define_method(:initialize) do |*args|
attributes.zip(args) do |sym, value|
instance_variable_set("@#{sym}", value)
end
instance_eval(&block) if block
end
end
end
# _____ _
# |_ _|__ ___| |_
# | |/ _ \/ __| __|
# | | __/\__ \ |_
# |_|\___||___/\__|
#
=begin test
require 'test/unit'
class TCModule < Test::Unit::TestCase
def test_attr_initializer
cc = Class.new
cc.class_eval {
initializer :ai
attr_reader :ai
}
c = cc.new(10)
assert_equal( 10, c.ai )
end
end
=end
Version data entries
23 entries across 23 versions & 1 rubygems