Re: Strange problem when not declaring the functions in interface

FROM : Daniel DeCovnick
DATE : Tue Apr 19 05:34:30 2005

Additionally, you can simply reopen the interface in your .m file:

in Bar.h:

@interface Bar : NSObject
{
   id ivar;
   id ivar2;
}
-(int)doStuff;
@end

in Bar.m

@interface Bar
-(int)foo1;
-(int)foo2;
@end

@implementation Bar
-(int)doStuff
{
    //code that does stuff
}

-(int)foo1
{
return 10;
}
-(int)foo2
{
return 20;
}
@end

Daniel DeCovnick
danhd123 at mac dot com
Softyards Software
http://www.softyards.com


On Apr 18, 2005, at 4:36 PM, Ivan S. Kourtev wrote:

> The default return type is (id).  If you don't declare the functions
> you should do:
>
> i = i + (int)[self foo1];
>
> --
> ivan
>
> On Apr 18, 2005, at 4:08 PM, Pradeep Kumar wrote:
>

>>  Hi All
>>
>>  I am not sure if I am missing something really fundamental or it is
>> really a bug. But I have
>>  this strange problem that's occurring when functions are not
>> declared in the interface.
>>  Thought of broadcasting this incase some one has any insight on why
>> this is happening.
>>
>>  Please review the following code snippet. Assume that the functions
>> foo1 and foo2 are
>>  declared in the interface declaration of MyObject.
>>
>>  @implementation MyObject
>>
>>  -(void)awakeFromNib
>>  {
>>       NSLog(@"[self foo1] returned %d", [self foo1]);
>>       NSLog(@"[self foo2] returned %d", [self foo2]);
>>       int foo1 = [self foo1];
>>       int foo2 = [self foo2];
>>       NSLog(@"Variables foo1 = %d\tfoo2 = %d", foo1, foo2);
>>       
>>       int i = 100;
>>       NSLog(@"i = %d", i);
>>       
>>       i = i+[self foo1];
>>       NSLog(@"Executing i = i+[self foo1] = %d", i);
>>       i = i+[self foo2];
>>       NSLog(@"Executing i = i+[self foo2]; = %d", i);
>>  }
>>
>>  -(int)foo1
>>  {
>>       return 10;
>>  }
>>
>>  -(int)foo2
>>  {
>>       return 20;
>>  }
>>
>>  @end
>>
>>  The result you get in the log is
>>
>>  [self foo1] returned 10
>>  [self foo2] returned 20
>>  Variables foo1 = 10     foo2 = 20
>>  i = 100
>>  Executing i = i+[self foo1] = 110
>>  Executing i = i+[self foo2]; = 130
>>
>>  The results are perfect.
>>
>>  Now remove the declarations of foo1 and foo2 from the interface file
>> of MyObject. After
>>  doing this here's what I get.
>>
>>  [self foo1] returned 10
>>  [self foo2] returned 20
>>  Variables foo1 = 10     foo2 = 20
>>  i = 100
>>  Executing i = i+[self foo1] = 410
>>  Executing i = i+[self foo2]; = 1660
>>
>>  See the results of the last two statements. 410 and 1660. Why is
>> this happening?
>>
>>  I am using XCode 1.5 with  Component versions Xcode IDE: 389.0,
>> Xcode Core: 387.0,
>>  ToolSupport: 372.0 on 10.3.9 (7W98). I know it is recommended that
>> functions be declared
>>  in the interface. But can not declaring the functions cause such a
>> huge difference in ways
>>  you can use non-declared functions?
>>
>>  Thanks
>>  prady
>>
>>
>>
>>