You're a genius! Thanks. Message is gone, and as a side benefit, the code still works.
I suppose if someone REALLY wanted to be a C++ pedant, myStruct *opts_char = reinterpret_cast<myStruct *>(reinterpret_cast<void *>(opts)); I wonder how much of the problem is the extern "OS". On MS VS, where I edit and test compile, the extern "OS" is skipped by an #ifdef WIN32 and in that situation I get no warning (neither with the old code nor with your new code). Or perhaps reinterpret_cast is just fussy. I did not try simply = (myStruct *)opts; I might have tried that before posting. Charles -----Original Message----- From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf Of Gord Tomlin Sent: Wednesday, January 29, 2020 11:42 AM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: C++ reinterpret_cast question On 2020-01-29 13:29, Charles Mills wrote: > If you're not a C++ person you may hit Delete at any time ... > > I want to load a module that is a non-executable table (and non-reentrant) > and then modify it. > > I have the entry point declared as > > extern "OS" typedef int compiler_t(void *parm1); > compiler_t *opts; > > (compiler_t is what is expected by several methods unrelated to this exact > question, and this all works, so I would like to leave that alone.) > > When I want to modify it I want to treat it as a struct. So I say > > myStruct *opts_char = reinterpret_cast<myStruct *>(opts); > > That generates the following warning in XLC: > > CCN5216 (W) An expression of type "extern "OS" int (*)(void *)" cannot be > converted to type "myStruct *". > > > The code all works perfectly. I'd just like to get rid of the warning. > Anyone know what to do? > > Charles > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN > I'm not in a position to test this right now, but does this work: myStruct *opts_char = reinterpret_cast<myStruct *>((void *) opts); -- Regards, Gord Tomlin Action Software International (a division of Mazda Computer Corporation) Tel: (905) 470-7113, Fax: (905) 470-6507 Support: https://actionsoftware.com/support/ ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
