Re: Question on a C++ string

From	T <T@invalid.invalid>
Newsgroups	comp.lang.c++
Subject	Re: Question on a C++ string
Date	2019-12-29 15:00 -0800
Organization	A noiseless patient Spider
Message-ID	<qubb67$702$2@dont-email.me> (permalink)
References	(1 earlier) <slrnr0gsmi.5eh.grahn+nntp@frailea.sa.invalid> <qu9sst$6j4$2@dont-email.me> <slrnr0h294.5eh.grahn+nntp@frailea.sa.invalid> <qub02f$5t1$2@dont-email.me> <87zhfapzgb.fsf@nosuchdomain.example.com>

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On 2019-12-29 13:57, Keith Thompson wrote:
> T <T@invalid.invalid> writes:
> [...]
>> I figured out through experimentation that Native Call
>> automatically add the chr(0) on to the end of a CString.
>>
>> And that sending Native Call a zero gets automatically
>> changed into a NULL.  Hmmm, I wonder what happens
>> if you really what a numerical zero.  That will be a
>> test for another day.
>>
>> Thank you all for all the wonderful help!
> 
> You're talking about Raku/Perl6, right?

Yes.  Once I understood what was going on in C++,
I was able to get my code working.

> Things you find out through experimentation aren't always reliable.
> It's possible that the Raku native call interface (which I haven't
> looked at) doesn't distinguish between a numerical zero and a null
> pointer.  If that's the case, it could work with any C++ implementation
> that represents a null pointer as all-bits-zero.  That's likely to be
> all existing C++ implementations, or at least all C++ implementations
> that Raku might interface with.  It's not guaranteed by the C++
> standard, though.  A literal 0 is a *null pointer constant*, but that
> doesn't imply that a *null pointer* is represented as all-bits-zero.

The Raku Native Call documentation is so, so bad
your only choice is experimentation.

NULL was a nightmare for me to figure out.  Once I did,
it was so simple it made my head spin

That you again for the wonder teaching!
-T

Thread

Question on a C++ string T <T@invalid.invalid> - 2019-12-28 22:35 -0800
  Re: Question on a C++ string Jorgen Grahn <grahn+nntp@snipabacken.se> - 2019-12-29 09:33 +0000
    Re: Question on a C++ string Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2019-12-29 01:45 -0800
      Re: Question on a C++ string T <T@invalid.invalid> - 2019-12-29 01:49 -0800
        Re: Question on a C++ string Jorgen Grahn <grahn+nntp@snipabacken.se> - 2019-12-29 11:04 +0000
        Re: Question on a C++ string Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2019-12-29 13:57 -0800
          Re: Question on a C++ string T <T@invalid.invalid> - 2019-12-29 14:57 -0800
    Re: Question on a C++ string T <T@invalid.invalid> - 2019-12-29 01:50 -0800
      Re: Question on a C++ string Jorgen Grahn <grahn+nntp@snipabacken.se> - 2019-12-29 11:08 +0000
        Re: Question on a C++ string T <T@invalid.invalid> - 2019-12-29 11:50 -0800
          Re: Question on a C++ string Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2019-12-29 13:57 -0800
            Re: Question on a C++ string T <T@invalid.invalid> - 2019-12-29 15:00 -0800
      Re: Question on a C++ string Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2019-12-29 13:57 -0800
        Re: Question on a C++ string T <T@invalid.invalid> - 2019-12-29 15:02 -0800
          Re: Question on a C++ string Paavo Helde <myfirstname@osa.pri.ee> - 2019-12-30 01:28 +0200
      Re: Question on a C++ string Sam <sam@email-scan.com> - 2019-12-29 21:47 -0500
  Re: Question on a C++ string Bo Persson <bo@bo-persson.se> - 2019-12-29 11:00 +0100
    Re: Question on a C++ string T <T@invalid.invalid> - 2019-12-29 02:33 -0800
      Re: Question on a C++ string Bart <bc@freeuk.com> - 2019-12-29 12:09 +0000
        Re: Question on a C++ string T <T@invalid.invalid> - 2019-12-29 11:51 -0800
  Re: Question on a C++ string Paavo Helde <myfirstname@osa.pri.ee> - 2019-12-29 12:17 +0200
    Re: Question on a C++ string Barry Schwarz <schwarzb@delq.com> - 2019-12-29 08:45 -0800
      Re: Question on a C++ string T <T@invalid.invalid> - 2019-12-29 11:54 -0800
  Re: Question on a C++ string Öö Tiib <ootiib@hot.ee> - 2019-12-29 02:56 -0800
    Re: Question on a C++ string T <T@invalid.invalid> - 2019-12-29 12:02 -0800
  Re: Question on a C++ string Barry Schwarz <schwarzb@delq.com> - 2019-12-29 08:39 -0800
    Re: Question on a C++ string T <T@invalid.invalid> - 2019-12-29 12:10 -0800

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