From: "naruse (Yui NARUSE)" <naruse@...>
Date: 2012-03-21T09:46:48+09:00
Subject: [ruby-core:43506] [ruby-trunk - Feature #6180] to_b for converting objects to a boolean value


Issue #6180 has been updated by naruse (Yui NARUSE).


BasicObject#! is optimized by YARV as following:

% ruby -e'puts RubyVM::InstructionSequence.compile(%[!!foo]).disasm'
== disasm: <RubyVM::InstructionSequence:<compiled>@<compiled>>==========
0000 trace            1                                               (   1)
0002 putself          
0003 send             :foo, 0, nil, 24, <ic:0>
0009 opt_not          <ic:3>
0011 opt_not          <ic:4>
0013 leave            

% rb -e'puts RubyVM::InstructionSequence.compile(%[foo.to_b]).disasm'
== disasm: <RubyVM::InstructionSequence:<compiled>@<compiled>>==========
0000 trace            1                                               (   1)
0002 putself          
0003 send             :foo, 0, nil, 24, <ic:0>
0009 send             :to_b, 0, nil, 0, <ic:1>
0015 leave 

As showed above, its byte code is shorter than with new method.
----------------------------------------
Feature #6180: to_b for converting objects to a boolean value
https://bugs.ruby-lang.org/issues/6180#change-24987

Author: AaronLasseigne (Aaron Lasseigne)
Status: Open
Priority: Normal
Assignee: 
Category: 
Target version: 


When a boolean return value is required it has become common practice is to use "!!" to convert the object. It would be more consistent to provide a "to_b" method on Object.


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