Re: Selectors and categories in GNUstep (porting from Cocoa)

[Andreas Hoeschler]

Hi Ian,

thanks for the quick response.

> well, to start off with, change this:
>
> switch ([attributeNames count])
>
> to this:
>
> switch (([attributeNames count]))

That helped. It were rather statements like this

        if (object = [self firstOne])
                ...

that caused warnings under GNUstep.


> as far as the "isEqualTo:" method not being found, you might not have
> <Foundation/NSString.h> imported, or you may just need to typecast the
> object to (NSString *) in order to avoid the warning.

Why NSString? According to my research the warnings are generated by the 
following code:

  if (sel == FBQualifierOperatorNotEqual)
      return [leftValue isNotEqualTo:rightValue];
   else if (sel == FBQualifierOperatorLessThan)
      return [leftValue isLessThan:rightValue];
   else if (sel == FBQualifierOperatorGreaterThan)
      return [leftValue isGreaterThan:rightValue];
   else if (sel == FBQualifierOperatorLessThanOrEqualTo)
      return [leftValue isLessThanOrEqualTo:rightValue];
   else if (sel == FBQualifierOperatorGreaterThanOrEqualTo)
      return [leftValue isGreaterThanOrEqualTo:rightValue];
   else if (sel == FBQualifierOperatorContains)
      return [leftValue doesContain:rightValue];
   else if (sel == FBQualifierOperatorLike)

where sel is a selector (SEL) and FBQualifierOperatorNotEqual,... are 
defined as follows:

#define FBQualifierOperatorEqual @selector(isEqualTo:)
#define FBQualifierOperatorNotEqual @selector(isNotEqualTo:)
#define FBQualifierOperatorLessThan @selector(isLessThan:)
#define FBQualifierOperatorGreaterThan @selector(isGreaterThan:)
#define FBQualifierOperatorLessThanOrEqualTo 
@selector(isLessThanOrEqualTo:)
#define FBQualifierOperatorGreaterThanOrEqualTo 
@selector(isGreaterThanOrEqualTo:)
#define FBQualifierOperatorContains @selector(doesContain:)
#define FBQualifierOperatorLike @selector(isLike:)

Why is this causing

FBQualifier.m: In function `-[FBKeyValueQualifier evaluateWithObject:]':
FBQualifier.m:390: warning: cannot find method.
FBQualifier.m:390: warning: return type for `isEqualTo:' defaults to id
FBQualifier.m:390: warning: pointer/integer type mismatch in conditional 
expression
FBQualifier.m:390: warning: return makes integer from pointer without a 
cast
FBQualifier.m:394: warning: cannot find method.
FBQualifier.m:394: warning: return type for `isNotEqualTo:' defaults to 
id
FBQualifier.m:394: warning: return makes integer from pointer without a 
cast
FBQualifier.m:396: warning: cannot find method.
FBQualifier.m:396: warning: return type for `isLessThan:' defaults to id
FBQualifier.m:396: warning: return makes integer from pointer without a 
cast
FBQualifier.m:398: warning: cannot find method.
FBQualifier.m:398: warning: return type for `isGreaterThan:' defaults to 
id
FBQualifier.m:398: warning: return makes integer from pointer without a 
cast
FBQualifier.m:400: warning: cannot find method.
FBQualifier.m:400: warning: return type for `isLessThanOrEqualTo:' 
defaults to id
...

Thanks,

   Andreas