[ruby-core:77847] [Ruby trunk Feature#12515] Create "Boolean" superclass of TrueClass / FalseClass
From:
nobu@...
Date:
2016-11-01 01:51:12 UTC
List:
ruby-core #77847
Issue #12515 has been updated by Nobuyoshi Nakada.
Rodrigo Rosenfeld Rosas wrote:
> Maybe something like:
```ruby
Boolean = [true, false]
```
> ~~~ruby
> input.zip([String, String, String, Boolean, String, Boolean]).all?{|(i, c)| c === i }
> ~~~
----------------------------------------
Feature #12515: Create "Boolean" superclass of TrueClass / FalseClass
https://bugs.ruby-lang.org/issues/12515#change-61159
* Author: Loren Segal
* Status: Rejected
* Priority: Normal
* Assignee:
----------------------------------------
Since Ruby 2.4 is unifying Bignum/Fixnum into Integer (https://bugs.ruby-lang.org/issues/12005), it seems reasonable to do something similar for TrueClass / FalseClass, and create a proper Boolean hierarchy. The implementation would be fairly straightforward and should be back compat unless someone already has a "Boolean" class at toplevel out there.
Given the compatibility implications of Integer, this Boolean proposal is even less intrusive.
Sample implementation:
~~~
class Boolean < BasicObject; end
class TrueClass < Boolean; end
class FalseClass < Boolean; end
~~~
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