Issue #12753 has been updated by phluid61 (Matthew Kerwin).


aycabta (ayca bta) wrote:
> Hi @naruse, matz said below.
> 
> matz (Yukihiro Matsumoto) wrote:
> > I vote for `allbit?`, `anybit?` and `nobit?`. I am not sure about plurality though.
> 
> For your action, as you know, [Dir.exists?](https://bugs.ruby-lang.org/projects/ruby-trunk/repository/revisions/60974/entry/dir.c#L3085) and [File.exists?](https://bugs.ruby-lang.org/projects/ruby-trunk/repository/revisions/60974/entry/file.c#L1676) are deprecated. What do you think about this?

exist/exists is tense, bit/bits is plurality, so it is unrelated.

----------------------------------------
Feature #12753: Useful operator to check bit-flag is true or false
https://bugs.ruby-lang.org/issues/12753#change-68129

* Author: tagomoris (Satoshi TAGOMORI)
* Status: Assigned
* Priority: Normal
* Assignee: matz (Yukihiro Matsumoto)
* Target version: 2.5
----------------------------------------
Ruby's 0 is truthy value. It's useful for many cases, but it's confusing and I made many bugs when I'm writing code to handle binary data, because my thought is almost same with one to write C code in such situation.

```ruby
n = get_integer_value
if n & 0b10100000
  # code for the case when flag is true
else
  # never comes here :(
end
```

IMO it's very useful to have methods for such use-cases, like `#and?` and `#xor?` (`#or?` looks not so useful... I can't imagine the use case of this operator, but it's better to have for consistency).

```ruby
n = get_integer_value
case
when n.and?(0b10000000)
  # negative signed char
when n.and?(0b01110000)
  # large positive
else
  # small positive
end
```




-- 
https://bugs.ruby-lang.org/

Unsubscribe: <mailto:ruby-core-request / ruby-lang.org?subject=unsubscribe>
<http://lists.ruby-lang.org/cgi-bin/mailman/options/ruby-core>