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Bernardo Dal Seno <piu1759@cdc8g5.cdc.polimi.it> writes:
> "Ciaran Jessup" <ciaranjessup@myrealbox.com> writes:
>
> > Hi all, sorry if this is a rediculously trivial problem, but I'm having some
> > problems with execi on legos0.2.5 , I can't seem to get g++ to compile when
> > I use it, I pass it a 'correct' function.....like so :
> >
> > int controlThread(int argc, char **argv) { ....blla....blah..blah }
> > defined earlier in file....
> >
> > execi(&controlThread, 0, NULL, 2, DEFAULT_STACK_SIZE);
> >
> > And it throws an error, saying :
> >
> > ANSI C++ forbids implicit conversion from `void *' in argument passing
>
>
> In C you should call execi() like this:
>
> execi(controlThread, 0, NULL, 2, DEFAULT_STACK_SIZE); /* Removed `&' */
>
> since a function is like an array name: it is an address. Probably the same
> applies to C++.
I've spoken too fast. Re-reading the error message I saw the real problem.
"controlThread" or "&controlThread" are the same. You should add a cast:
execi(&controlThread, 0, (char **)NULL, 2, DEFAULT_STACK_SIZE);
NULL is defined mem.h as "((void*)0)" and that causes problem with C++ due
to the stricter type checking. The right definition for NULL in C++ is
(according to B. Stroustrup):
const int NULL = 0;
legOS included should be corrected (any maintainer listening? :-).
bye
Bernardo
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Message is in Reply To:
 | | Re: execi and C++
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| (...) In C you should call execi() like this: execi(controlThread, 0, NULL, 2, DEFAULT_STACK_SIZE); /* Removed `&' */ since a function is like an array name: it is an address. Probably the same applies to C++. bye Bernardo (24 years ago, 18-Feb-01, to lugnet.robotics.rcx.legos)
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