From: Jia Pu <very.funny.j@...>
Date: 2006-09-01T12:08:37+09:00
Subject: Q: How to use non-builtin class as hash key?

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I have a class defined as:

###########################
class MyClass
    def initialize(s1, s2, s3)
        @string1 = s1
        @string2 = s2
        @string3 = s3
    end

    def hash
        return (@string1 + @string2 + @string3).hash
    end
end
###########################

Then I create two instances of this class:
###########################
obj1 = MyClass.new('a', 'b', 'c')
obj2 = MyClass.new('a', 'b', 'c')
###########################

If verify obj1 and obj2 do have the same hash value, I check that
'obj1.hash == obj2.hash'
returns true

Now i try to use those objects as hash key:
h[obj1] = 'abc'
h[obj2] = 'def'

I expected h contains only one item with value 'def', since obj1 and obj2
have the same hash value. But it turns out it has 2 items instead.

Did I miss something?

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