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Re: *&aptr , &*aptr question

From BartC <bc@freeuk.com>
Newsgroups comp.lang.c
Subject Re: *&aptr , &*aptr question
Date 2016-06-15 01:15 +0100
Organization A noiseless patient Spider
Message-ID <njq6mo$9th$1@dont-email.me> (permalink)
References (2 earlier) <njpul4$eiv$1@dont-email.me> <81f2561c-bea5-4846-9d10-9862764110ef@googlegroups.com> <lvalue-20160614232823@ram.dialup.fu-berlin.de> <njq1ud$sam$1@dont-email.me> <lninxb1g9k.fsf@kst-u.example.com>

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On 15/06/2016 00:51, Keith Thompson wrote:
> BartC <bc@freeuk.com> writes:
> [...]
>> What's going on here then:
>>
>> int* Ptr;
>>
>> Ptr = Ptr;
>> Ptr = *Ptr;  //w
>> Ptr = &Ptr;  //w
>> Ptr = &*Ptr;
>> Ptr = *&Ptr;
>>
>> Ptr = &*&Ptr; //w
>> Ptr = *&*Ptr;//w

>>
>> Ptr = &*&*Ptr;
>> Ptr = *&*&Ptr;
>>
>> These are all fine according to gcc (and TCC and clang; other compilers
>> aren't quite so happy).
>
> What do you mean by "fine"?  Did you not get warnings?

Yes, I did! But I keep forgetting that the way I use gcc hides all the 
warnings. So the lines I've marked //w above had warnings (from gcc, 
clang, tcc). Other compilers gave actual errors.

Sorry...

-- 
Bartc

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Thread

*&aptr , &*aptr question G G <gdotone@gmail.com> - 2016-06-14 13:43 -0700
  Re: *&aptr , &*aptr question Richard Heathfield <rjh@cpax.org.uk> - 2016-06-14 22:01 +0100
    Re: *&aptr , &*aptr question Ike Naar <ike@iceland.freeshell.org> - 2016-06-14 21:20 +0000
      Re: *&aptr , &*aptr question G G <gdotone@gmail.com> - 2016-06-14 14:38 -0700
    Re: *&aptr , &*aptr question Richard Heathfield <rjh@cpax.org.uk> - 2016-06-14 22:42 +0100
    Re: *&aptr , &*aptr question Ken Brody <kenbrody@spamcop.net> - 2016-06-15 14:22 -0400
      Re: *&aptr , &*aptr question Richard Heathfield <rjh@cpax.org.uk> - 2016-06-15 19:24 +0100
  Re: *&aptr , &*aptr question "James R. Kuyper" <jameskuyper@verizon.net> - 2016-06-14 17:17 -0400
  Re: *&aptr , &*aptr question Keith Thompson <kst-u@mib.org> - 2016-06-14 14:37 -0700
  Re: *&aptr , &*aptr question "James R. Kuyper" <jameskuyper@verizon.net> - 2016-06-14 17:40 -0400
    Re: *&aptr , &*aptr question "James R. Kuyper" <jameskuyper@verizon.net> - 2016-06-14 17:49 -0400
    Re: *&aptr , &*aptr question BartC <bc@freeuk.com> - 2016-06-14 22:57 +0100
      Re: *&aptr , &*aptr question jameskuyper@verizon.net - 2016-06-14 15:22 -0700
        Re: *&aptr , &*aptr question "James R. Kuyper" <jameskuyper@verizon.net> - 2016-06-14 18:40 -0400
        Re: *&aptr , &*aptr question BartC <bc@freeuk.com> - 2016-06-14 23:44 +0100
        Re: *&aptr , &*aptr question BartC <bc@freeuk.com> - 2016-06-14 23:54 +0100
          Re: *&aptr , &*aptr question Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-06-15 00:14 +0100
          Re: *&aptr , &*aptr question Keith Thompson <kst-u@mib.org> - 2016-06-14 16:51 -0700
            Re: *&aptr , &*aptr question BartC <bc@freeuk.com> - 2016-06-15 01:15 +0100
              Re: *&aptr , &*aptr question Keith Thompson <kst-u@mib.org> - 2016-06-14 17:44 -0700
              Re: *&aptr , &*aptr question David Brown <david.brown@hesbynett.no> - 2016-06-15 09:12 +0200
                Re: *&aptr , &*aptr question Richard Heathfield <rjh@cpax.org.uk> - 2016-06-15 08:28 +0100
                Re: *&aptr , &*aptr question David Brown <david.brown@hesbynett.no> - 2016-06-15 10:26 +0200
                Re: *&aptr , &*aptr question Richard Heathfield <rjh@cpax.org.uk> - 2016-06-15 09:48 +0100
                Re: *&aptr , &*aptr question BartC <bc@freeuk.com> - 2016-06-15 11:05 +0100
                Re: *&aptr , &*aptr question David Brown <david.brown@hesbynett.no> - 2016-06-15 12:22 +0200
                Re: *&aptr , &*aptr question Malcolm McLean <malcolm.mclean5@btinternet.com> - 2016-06-15 03:55 -0700
                Re: *&aptr , &*aptr question David Brown <david.brown@hesbynett.no> - 2016-06-15 13:15 +0200
                Re: *&aptr , &*aptr question BartC <bc@freeuk.com> - 2016-06-15 13:08 +0100
                Re: *&aptr , &*aptr question David Brown <david.brown@hesbynett.no> - 2016-06-15 14:15 +0200
                Re: *&aptr , &*aptr question BartC <bc@freeuk.com> - 2016-06-15 14:02 +0100
                Re: *&aptr , &*aptr question Malcolm McLean <malcolm.mclean5@btinternet.com> - 2016-06-15 13:38 -0700
                Re: *&aptr , &*aptr question David Brown <david.brown@hesbynett.no> - 2016-06-16 00:01 +0200
                Re: *&aptr , &*aptr question Malcolm McLean <malcolm.mclean5@btinternet.com> - 2016-06-16 00:58 -0700
                Re: *&aptr , &*aptr question supercat@casperkitty.com - 2016-06-15 09:06 -0700
                Re: *&aptr , &*aptr question BartC <bc@freeuk.com> - 2016-06-15 17:54 +0100
                Re: *&aptr , &*aptr question raltbos@xs4all.nl (Richard Bos) - 2016-06-15 20:10 +0000
    Re: *&aptr , &*aptr question supercat@casperkitty.com - 2016-06-14 16:28 -0700
      Re: *&aptr , &*aptr question Keith Thompson <kst-u@mib.org> - 2016-06-14 16:54 -0700
        Re: *&aptr , &*aptr question supercat@casperkitty.com - 2016-06-14 19:13 -0700
          Re: *&aptr , &*aptr question Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-06-15 13:19 +0100
            Re: *&aptr , &*aptr question Tim Rentsch <txr@alumni.caltech.edu> - 2016-06-16 10:39 -0700
              Re: *&aptr , &*aptr question supercat@casperkitty.com - 2016-06-16 12:06 -0700
                Re: *&aptr , &*aptr question Tim Rentsch <txr@alumni.caltech.edu> - 2016-06-21 12:21 -0700
              Re: *&aptr , &*aptr question Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-06-16 21:06 +0100
                Re: *&aptr , &*aptr question supercat@casperkitty.com - 2016-06-16 14:35 -0700
                Re: *&aptr , &*aptr question Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-06-17 01:22 +0100
                Re: *&aptr , &*aptr question Tim Rentsch <txr@alumni.caltech.edu> - 2016-06-16 22:21 -0700
                Re: *&aptr , &*aptr question Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-06-18 00:55 +0100
                Re: *&aptr , &*aptr question supercat@casperkitty.com - 2016-06-17 17:26 -0700
                Re: *&aptr , &*aptr question Tim Rentsch <txr@alumni.caltech.edu> - 2016-06-21 12:19 -0700
                Re: *&aptr , &*aptr question supercat@casperkitty.com - 2016-06-21 13:09 -0700
  Re: *&aptr , &*aptr question Eric Sosman <esosman@comcast-dot-net.invalid> - 2016-06-14 22:30 -0400
    Re: *&aptr , &*aptr question Tim Rentsch <txr@alumni.caltech.edu> - 2016-06-15 14:20 -0700

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