Re: Question on a C++ string

From	Keith Thompson <Keith.S.Thompson+u@gmail.com>
Newsgroups	comp.lang.c++
Subject	Re: Question on a C++ string
Date	2019-12-29 13:57 -0800
Organization	None to speak of
Message-ID	<87zhfapzgb.fsf@nosuchdomain.example.com> (permalink)
References	<qu9hgc$nut$1@dont-email.me> <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>

Show all headers | View raw

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?

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.

-- 
Keith Thompson (The_Other_Keith) Keith.S.Thompson+u@gmail.com
    [Note updated email address]
Working, but not speaking, for Philips Healthcare
void Void(void) { Void(); } /* The recursive call of the void */

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

csiph-web