[#86755] [Ruby trunk Feature#14723] [WIP] sleepy GC — normalperson@...
Issue #14723 has been reported by normalperson (Eric Wong).
6 messages
2018/04/29
[ruby-core:86681] [Ruby trunk Feature#14701] If the object is not frozen, I want to be able to redefine the compound assignment operator.
From:
sonots@...
Date:
2018-04-25 15:19:33 UTC
List:
ruby-core #86681
Issue #14701 has been updated by sonots (Naotoshi Seo).
> Use append instead of += for arrays.
`+=` operation for NArray is totally different with `append` for ruby array.
What we want to do with `+=` operation for NArray is to do element-wise addition like
```
narray([1, 2, 3]) += narray([1, 1, 1]) #=> narray([2, 3, 4])
```
Because the memory size of a NAarray can be large such as 1GB, we wan to perform in-place operation without allocating a new NArray.
> Changing the behavior of += would have too much compatibility problems from side-effect.
It is not necessary to change behavior of ruby default.
We just want to redefine `+=` operator for a specific type of objects such as NArray. So, compatibility problems occur for only classes which redefine `+=` operator newly.
----------------------------------------
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-71641
* 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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