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Contents
# TITLE:
#
# Reference
#
# SUMMARY:
#
# Reference provides a way to access object indirectly.
# This allows for the object itself to be changed on the fly.
#
# COPYRIGHT:
#
# Copyright (c) 2005 Thomas Sawyer
#
# LICENSE:
#
# Ruby License
#
# This module is free software. You may use, modify, and/or redistribute this
# software under the same terms as Ruby.
#
# This program is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE.
#
# AUTHORS:
#
# - Thomas Sawyer
# = Reference
#
# Reference provides a way to access object indirectly.
# This allows for the object itself to be changed on the fly.
#
# == Synopsis
#
# a = "HELLO"
# b = ref(a)
# puts b #=> "HELLO"
# c = 10
# b.become(c)
# puts b #=> "10"
#
class Reference
# Privatize most Kernel methods.
private *instance_methods
def self.new(obj)
ref = allocate
ref.become obj
ref
end
def method_missing(*args, &block)
@ref.__send__(*args, &block)
end
def become(obj)
old = @ref
@ref = obj
old
end
def __value__
@ref
end
alias_method :instance_delegate, :__value__
end
module Kernel
# Shortcut reference constructor.
def ref(x)
Reference.new(x)
end
end
# _____ _
# |_ _|__ ___| |_
# | |/ _ \/ __| __|
# | | __/\__ \ |_
# |_|\___||___/\__|
#
=begin #test
require 'test/unit'
# TODO
=end
Version data entries
13 entries across 13 versions & 1 rubygems