[ruby-core:86696] [Ruby trunk Feature#14701] If the object is not frozen, I want to be able to redefine the compound assignment operator.

Issue #14701 has been updated by masa16 (Masahiro Tanaka).


I think it is enough to change the meaning of

~~~ ruby
x += a
~~~

to

~~~ ruby
if x.respond_to?(:'+=')
  x.send(:'+=',a)
else
  x = x + a
end
~~~

Matz rejected this in http://blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-dev/9127,
but I do not completely understand the reason.

----------------------------------------
Feature #14701: If the object is not frozen, I want to be able to redefine the compound assignment operator.
https://bugs.ruby-lang.org/issues/14701#change-71655

* Author: naitoh (Jun NAITOH)
* Status: Rejected
* Priority: Normal
* Assignee: 
* Target version: 
----------------------------------------
If the object is not frozen, I want to be able to redefine the compound assignment operator (e.g. +=, -=, *=, /=, ..etc ).

https://docs.ruby-lang.org/ja/latest/doc/spec=2foperator.html

* Redefinable operator (method) 

~~~
    |  ^  &  <=>  ==  ===  =~  >   >=  <   <=   <<  >>
    +  -  *  /    %   **   ~   +@  -@  []  []=  ` ! != !~
~~~

* use case

~~~
> require 'numo/narray'
> a = Numo::Int32[5, 6]
=> Numo::Int32#shape=[2]
[5, 6]
> a.object_id
=> 70326927544920
> a += 1
=> Numo::Int32#shape=[2]
[6, 7]
> a.object_id
=> 70326927530540
> a.inplace + 1
=> Numo::Int32(view)#shape=[2]
[7, 8]
> a.object_id
=> 70326927530540
~~~

With Numo::NArray, using "inplace" instead of "+=" will update the same object so it will be faster.

I want to write "a += 1" instead of "a.inplace + 1".
However, Ruby can not redefine "+=".



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