README.md

instancevalue

Description

Constant values for each instance.

Features

instance_variable like API

• .value_reader
• #instance_value_defined?
• #instance_value_get
• #instance_value_set
• #instance_values
• #remove_instance_value

Aliased shortname

• #val

Usage

require 'instancevalue'

class Person

  include InstanceValue
  
  value_reader :birthday

  def initialize(birthday)
    val :birthday, birthday
  end

  def age
    (Time.now - birthday) / (60 * 60 * 24 * 365)
  end

end

person = Person.new Time.at YOUR_BIRTHDAY
person.birthday                                 #=> YOUR_BIRTHDAY
person.age                                      #=> age at runtime
person.instance_eval{val :birthday, Time.now}   #=> Exception

Requirements

• Ruby 1.9.2 or later

Install

$ gem install instancevalue

Link

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License

The MIT X11 License
Copyright (c) 2012 Kenichi Kamiya
See MIT-LICENSE for further details.