[ruby-core:58077] [ruby-trunk - Feature #9060] "Assignment" operator overloading

Issue #9060 has been updated by nobu (Nobuyoshi Nakada).

Description updated


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Feature #9060: "Assignment" operator overloading
https://bugs.ruby-lang.org/issues/9060#change-42658

Author: popoxee (Bruce Metz)
Status: Rejected
Priority: Normal
Assignee: 
Category: 
Target version: 


=begin
I understand assignment in ruby is assigning an object to the variable. However there are other cases we need to use assignments. For example:

 class Foo
 end

 class Bar < Foo
 end

 f = Foo.new
 b = Bar.new
 //Some operations on b

Now we want ((|f|)) to contain the same data as ((|b|)). But if we use (({f = b})), ((|f|)) will not be (({Foo})) any more.
Or we can define a method like (({Foo##loadFromBar})), but (({Foo})) is the super class of (({Bar})) and usually defined before (({Bar}))...

Can we have something like:
 f := b
so that ((|f|)) will have the same shared data with ((|b|))?

And we can even load data from other classes by overloading this operator:

 class Foo
   def :=(f)
     @data = f
   end
 end
 f = Foo.new
 f := 2.2

We can always achieve this by defining a named method, but this operator can provide some syntax sugar and convenience.
=end



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