From: masa16.tanaka@...
Date: 2018-04-26T01:17:14+00:00
Subject: [ruby-core:86686] [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).


Former NArray had add! method, but it results in a confused result.

~~~ ruby
require 'narray'

a = NArray.int(2,2).indgen!
a[1,true] += 10
p a
# => NArray.int(2,2): 
#    [ [ 0, 11 ], 
#      [ 2, 13 ] ]

a = NArray.int(2,2).indgen!
a[0,true].add!(10)
p a
# => NArray.int(2,2): 
#    [ [ 0, 1 ], 
#      [ 2, 3 ] ]
~~~

So I dismissed add! method of the current numo-narray.


----------------------------------------
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-71646

* 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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