From: Thufir <hawat.thufir@...>
Date: 2007-11-11T12:30:35+09:00
Subject: composition (Dragon "has a" Trait)

I want to put all of the current attr_accessor's
(:life, :strength, :charisma, :weapon) into class Traits so that each
Creature instance will have one Traits object to go along with that
class.

by themselves, Traits, Dragon and Class give no error messages from
ruby.  From using the IRB it's clear that it's line 6 of the Dragon
class:

@traits.life    = 1340


C:\code\creat3>
C:\code\creat3>
C:\code\creat3>creatures.rb
./Dragon.rb:6:in `initialize': undefined method `life=' for
nil:NilClass (NoMeth
odError)
        from C:/code/creat3/creatures.rb:12:in `new'
        from C:/code/creat3/creatures.rb:12
        from C:/code/creat3/creatures.rb:10:in `times'
        from C:/code/creat3/creatures.rb:10

C:\code\creat3>
C:\code\creat3>
C:\code\creat3>type creatures.rb
require 'ArrayOfCreatures'
require 'MakeCreature'
require 'Location'

include MakeCreature

NumOfCreatures=3
creatures = ArrayOfCreatures.instance

NumOfCreatures.times do |i|
#       creatures[i]=MakeCreature.randomCreature
        creatures[i]=Dragon.new
end

creatures.length.times do |i|
        number = Kernel.rand(6)
        creatures.oneElementToString(i)
        print "factorial of\t"
        print number
        print "\tis\t"
        print Math.factorial(number)
end

C:\code\creat3>
C:\code\creat3>
C:\code\creat3>type Creature.rb
require 'Math'
require 'Traits'

class Creature

Creature.extend Math
include Math


def initialize ()
        @location       =       Room.new
        @traits         =       Traits.new
end

def toString ()
        print "class\t\t"
        print self.class

        @attributes.toString

        print "\n"
end


end

C:\code\creat3>
C:\code\creat3>type Dragon.rb
require 'Creature'

class Dragon < Creature

def initialize ()
        @traits.life    =       1340
end


end

C:\code\creat3>
C:\code\creat3>



thanks,

Thufir