Re: First C program

The GENCSRC facility allows you to generate C/C++ header files for database
files.  That is the mechanism used in the C++ language.  You can find a
comparison between #pragma mapinc and GENCSRC in Appendix A of the ILE C/C+
+ Programmer's Guide.  Here is a link to the 6.1 version of that document:
http://pic.dhe.ibm.com/infocenter/iseries/v6r1m0/topic/rzaha/sc092712.pdf

Aaron


c400-l-bounces-Zwy7GipZuJhWk0Htik3J/[email protected] wrote on 04/03/2014 10:39:56 AM:

> From: Steve Richter <[email protected]>
> To: "Bare Metal Programming IBM i (AS/400 and iSeries)" <c400-
> [email protected]>,
> Date: 04/03/2014 10:40 AM
> Subject: Re: [C400-L] First C program
> Sent by: c400-l-bounces-Zwy7GipZuJhWk0Htik3J/[email protected]
>
> I notice that C++ does not support the #pragma mapinc statement:
>
> #pragma mapinc("ddhpf","*libl/REL(*ALL)","input"," ",,"")
> #include "ddhpf"
>
> I was going to suggest compiling as C++ and using classes to reduce the
> complexity of the code. But the CRTCPPMOD command does not support
#pragma
> mapinc ?
>
> "QGPL/QRPGLESRC(CSAMPLEC)", line 22.10: CZP0836(30) The #include file
>   "ddhpf" is not found.
>
> -Steve
>
>
>
> On Thu, Apr 3, 2014 at 6:39 AM, Frank Kolmann <[email protected]> wrote:
>
> > Hi Jevgeni
> >
> >
> >
> > Thank you.  You make good points.
> >
> > That is a good way of trapping the == issue.
> >
> > I will follow Barbaras advice in the coding of the if.
> >
> >
> >
> > I like the way you use the #define for the type defs.
> >
> > It does make the code clearer, I will use that sytle.
> >
> >
> >
> > Frank
> >
> >
> >
> >
> >
> > >*Subject: Re: First C program
> >
> > >*From: Jevgeni Astanovski <Jevgeni.Astanovski@xxxxxxxxxxxxx>
> >
> > >*Date: Wed, 2 Apr 2014 07:54:34 +0000
> >
> > >Yes. Barbara mentioned the define and I haven't...
> >
> > >Definitely there are lots of this sort of advises to avoid =/==
possible
> > mistake.
> >
> > >I've never saw the one you referred.
> >
> > > However some use another technique:
> >
> > >Instead of writing
> >
> > >if ((pf = _Ropen(PFILENAME, "rr")) == NULL)
> >
> > >they write
> >
> > >if (NULL == (pf = _Ropen(PFILENAME, "rr")))
> >
> > >In this case if you make a mistake and write
> >
> > >if (NULL = (pf = _Ropen(PFILENAME, "rr")))
> >
> > >you will immediately get a syntax error.
> >
> > >
> >
> > ....
> >
> > >
> >
> > >On the second issue - this is purely a question of how readable is
your
> > program.
> >
> > > My personal practice is to use "explicit" way of defining types. For
> > example:
> >
> > >
> >
> > >#pragma mapinc("dspf", "*LIBL/Y80ALD(ADDCHRG)", "both", "_P", "Y80",
> > "Y80")
> >
> > > #include "dspf"
> >
> > > #define INPUT_T Y80_ADDCHRG_i_t
> >
> > > #define OUTPUT_T Y80_ADDCHRG_o_t
> >
> > >
> > >in this case it is (more) clear where these types are derived from....
> > --
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