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List:       ruby-core
Subject:    [ruby-core:86757] [Ruby trunk Feature#14701] If the object is not frozen, I want to be able to redef
From:       gotoken () gmail ! com
Date:       2018-04-29 5:50:05
Message-ID: redmine.journal-71710.20180429055004.400acafb79c25012 () ruby-lang ! org
[Download RAW message or body]

Issue #14701 has been updated by gotoken (Kentaro Goto).


Maybe I don't get the point though, if `Numo::NArray#inplace` and `inplace.+` always \
return identical object, `#inplace=` can be define and one can wrote 

```
a = Numo::Int32[5, 6]
a.inplace += 1
```

means shorthand for `a.inplace = a.inplace + 1`. This setter `#inplace=` has no \
side-effect because `a.inplace + 1` returns identical to `a.inplace` of LHS by \
assumption.

It also gives same side-effects to `a` for these:

```
a.inplace + 1
```

```
inp = a.inplace
inp += 1
```

By the way, to define similar things with index `#[]=`, `#[]` should be returns a \
view. 

----------------------------------------
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-71710

* 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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