Objective-C++: passing Objective-C objects to C++ methods?
Objective-C++: passing Objective-C objects to C++ methods?
- Subject: Objective-C++: passing Objective-C objects to C++ methods?
- From: <email@hidden>
- Date: Sat, 11 Nov 2006 23:21:29 -0500
I am new to Objective-C++, and I am having some problems. I'm using
a recent snapshot of GCC 4.2, for the record.
Passing a statically typed Objective-C object to a C++ function
with a parameter of type id works fine. However, I get compilation
errors when passing the same statically typed Objective-C object to
a method of a C++ class that has a parameter of type id.
I'm also getting errors when (in this case) I'm passing Objective-C
classes of type Test, but declared to be of type id, to C++ object
methods expecting an argument of type Test*.
I'm getting these errors:
test.mm: In function 'int main(int, char**)':
test.mm:51: error: no matching function for call to
'printer::print_Test(objc_object*&)'
test.mm:33: note: candidates are: void printer::print_Test(Test*)
test.mm:53: error: no matching function for call to
'printer::print_id(Test*&)'
test.mm:37: note: candidates are: void
printer::print_id(objc_object*)
Here is the test.mm code in question:
----8<-----
#import <stdio.h>
#import <objc/Object.h>
@interface Test : Object {
int i;
}
-(id) init:(int)n;
-(id) print;
@end
@implementation Test
-(id) init:(int)n {
i = n;
return self;
}
-(id) print {
printf("%d\n", i);
return self;
}
@end
class printer {
public:
void print_Test(Test* test) {
[test print];
}
void print_id(id test) {
[test print];
}
};
int main(int argc, char** argv) {
Test* test_Test = [[Test alloc] init:100];
id test_id = [[Test alloc] init:200];
printer p;
p.print_Test(test_Test);
p.print_Test(test_id);
p.print_id(test_Test);
p.print_id(test_id);
return 0;
}
----8<-----
What I'd like to do is to be able to pass an Objective-C object
declared to be of type id, along with any statically typed
Objective-C object, to the C++ method. Is this something that can
be done in Objective-C++? How would one go about doing this?
Unfortunately, I don't have a Mac available to test this with. What
behavior does Apple's version of GCC exhibit for the above
Objective-C++ code? Does it compile?
Any help would be most appreciated.
- Frederik Smith
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