Project

General

Profile

Feature #14701

If the object is not frozen, I want to be able to redefine the compound assignment operator.

Added by naitoh (Jun NAITOH) about 2 years ago. Updated 11 months ago.

Status:
Open
Priority:
Normal
Assignee:
-
Target version:
-
[ruby-core:<unknown>]

Description

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 "+=".

Also available in: Atom PDF