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RE: Pre-RFC: Real "boolean" SV type

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Carl Friedberg
August 4, 2021 15:22
RE: Pre-RFC: Real "boolean" SV type
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Hi Paul LeoNerd,

Yes, please write the RFC. Thank you,

Carl Friedberg
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165 William St New York NY
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-----Original Message-----
From: Paul "LeoNerd" Evans <> 
Sent: Wednesday, August 4, 2021 10:58 AM
To: Perl5 Porters <>
Subject: Pre-RFC: Real "boolean" SV type

I propose the addition of a new SV type, of SVt_BOOL. Should I write an RFC?

This type will act much like the existing "booleans" of PL_sv_no and PL_sv_yes, except its type will remain distinct, so it will be possible to distinguish "that SV is a boolean". This is a requirement for certain kinds of data serialisation - such as JSON or MsgPack - and may be useful for many other purposes too.

Still to be determined: a pureperl interface on it. E.g. would this be

  use feature 'bool';

  my $yes = true;   # new literal value keywords
  my $no  = false;  #

  use Scalar::Util 'svtype';

  is( svtype($yes), "BOOL", 'true is SVt_BOOL');

Thoughts on a postcard*.

*: Where "postcard" means: **PLEASE KEEP REPLIES SHORT**. This is a pre-RFC question. Replies should be limited to the question of whether I should write the RFC - not about the feature itself.

Paul "LeoNerd" Evans      |  |

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