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Re: Print the values of the members of a structure

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Bart <bc@freeuk.com> writes:

> On 29/05/2019 11:21, Stefan Ram wrote:
>> A Google poster writes:
>>> Subject: Print the values of the members of a structure
>>
>>    One cannot directly print structure members automatically in
>>    standard C. Some debuggers or implementations might provide
>>    such a feature as an extension.
>>
>>    One can implement such a feature in C by adding run-time
>>    information about the structs or implementing custom records.
>>    For example, when one uses the Python run-time, one then can
>>    automatically print Python records (objects) using C code.
>
>
> You don't need runtime info, not when the format string is constant
> and known to the compiler.
>
> For example:
>
>     printf("%S", a);
>
> could be compiled as though the user had written:
>
>     printf("%d %s", a.age, a,name);
>
> There will still be plenty of problems: no control over formats; what
> to do with unions; how to deal with arrays. But for simple cases like
> this, it can handy.

The OP is happy to provide the format, just not the member names.  It's
not a massive problem, but a simple solution would be to provide
something like a syntax "macro": __MEMBERS__(a) which expands to the
list of names.  Of course it can't be a macro in the usual sense because
of how they are currently specified.  Types don't exist when macros are
expanded, much less declarations that link names to types.

-- 
Ben.

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Print the values of the members of a structure ab.avramidis@cloudsolutions.co.uk - 2019-05-29 02:19 -0700
  Re: Print the values of the members of a structure mark.bluemel@gmail.com - 2019-05-29 02:32 -0700
    Re: Print the values of the members of a structure Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2019-05-29 08:28 -0600
      Re: Print the values of the members of a structure ab.avramidis@cloudsolutions.co.uk - 2019-05-29 07:35 -0700
  Re: Print the values of the members of a structure Bart <bc@freeuk.com> - 2019-05-29 11:47 +0100
    Re: Print the values of the members of a structure Ben Bacarisse <ben.usenet@bsb.me.uk> - 2019-05-29 12:16 +0100
      Re: Print the values of the members of a structure Bart <bc@freeuk.com> - 2019-05-29 15:45 +0100
    Re: Print the values of the members of a structure Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2019-05-29 08:34 -0600
      Re: Print the values of the members of a structure Clifford Heath <no.spam@please.net> - 2019-05-30 11:55 +1000
        Re: Print the values of the members of a structure Clifford Heath <no.spam@please.net> - 2019-06-02 22:58 +1000
          Re: Print the values of the members of a structure Ben Bacarisse <ben.usenet@bsb.me.uk> - 2019-06-02 17:09 +0100
          Re: Print the values of the members of a structure Tim Rentsch <tr.17687@z991.linuxsc.com> - 2019-06-02 23:05 -0700
            Re: Print the values of the members of a structure Clifford Heath <no.spam@please.net> - 2019-06-03 17:38 +1000
  Re: Print the values of the members of a structure James Kuyper <jameskuyper@alumni.caltech.edu> - 2019-05-29 07:57 -0400

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