Re: REPOST: compiler error passing method

[Ken Cline]

On Mon, 4 Aug 1997, Steve Emsley wrote:

> -(void) test {
>   double tmp;
>   tmp = [lightSpace spectral: 50];
>   printf("%d\n",tmp);
>   return;
> }
> 
> I get the error message:
> 
> OModel.m: In function `_i_POModel__test':
> POModel.m:665: warning: cannot find method.
> POModel.m:665: warning: return type for `spectral:' defaults to id
> POModel.m:665: incompatible types in assignment
> POModel.m:666: warning: int format, double arg (arg 2)
> make: *** [POModel.o] Error 1


Some things to try:

   1. Check that `spectral' is defined in LightTable.h 
         (or a superclass)

   2. Check that the return type for `spectral' is double

   3. Check that LightTable.h is imported into
         POModel.m, either
            - directly into POModel.m 
         OR
            - into POModel.h *and* then POModel.h is
              imported into POModel.m

   4. Change `test' as follows

          -(void) test {
             double tmp;
             tmp = (double)[lightSpace spectral: 50]; 
                 // ^^^^^^ -- casting just to be safe
             printf("%e\n",tmp);
                 //   ^    -- print `tmp' as a double OR
             printf("%d\n",(int)tmp);
                 //   ^     ^^^ -- print `tmp' as an int
             return;
          }

   5. Alternately, make `tmp' an id and cast in the printf
         statement.


The fact that the compiler cannot find `spectral' appears to
be what is causing make to fail.  The other warnings should
not cause the compilation to fail but should still be
corrected.

I hope this helps.

Ken.

_________________________________________________________
Ken Cline                             address@hidden
SAIC                                 VOICE (410) 571-0413
Annapolis, MD                          FAX (301) 261-8427


                  ==================================
   Swarm-Support is for discussion of the technical details of the day
   to day usage of Swarm.  For list administration needs (esp.
   [un]subscribing), please send a message to <address@hidden>
   with "help" in the body of the message.
                  ==================================