From: Mark Sparshatt <msparshatt@...>
Date: 2004-04-30T04:45:49+09:00
Subject: Re: coerce(), what protocol to implement it

Jean-Hugues ROBERT wrote:

> At 03:45 30/04/2004 +0900, you wrote:
>
>> 4) Can I redefine coerce() ? If so, when is it called ? (I tried,
>> it is not called...)
>>
>> 5) By defining to_str() I can have "xx" + MyClass.new(xx) work. What
>> do I have to redefine to have 1 + MyClass.new(xx) work ?
>>
this works for me

class MyClass
    def initialize(val)
       @value = val
    end

    def coerce(other)
       [other, @value]
    end
end

1 + MyClass.new(5)
#=> 6

>> Google "ruby coerce" provided little help.
>>
You can find some information by searching the ruby-talk archives 
http://blade.nagaokaut.ac.jp/ruby/ruby-talk/index.shtml for coerce.

HTH

--
Mark Sparshatt