Pass by reference in objective c

Question

I am a calling c++ method from objective c:

C++ Method:

void TestMethod( size_t& outputSize,
                 OutputArray& outputArray );

Objective C:

-(void) testMethodObjc : outputSize,
       OutputArrayObjc : outputArray
{

     TestMethod( outputSize, [outputArray getArray ]);
}

How do I accomplish this? I hear from other postings that objective-c does not support pass by reference.

Undo is right, here is a good example http://stackoverflow.com/questions/2892520/passing-arguments-by-value-or-by-reference-in-objective-c — Eugene Gordin, Apr 25 '13 at 04:59

score 1 · Accepted Answer · answered Apr 24 '13 at 22:37

1

You should be able to - Obj-C is a strict subset of C. Just make sure that the file the code is in is a .mm file - not just .m

answered Apr 24 '13 at 22:37

Undo

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score 1 · Answer 2 · answered Apr 25 '13 at 22:36

1

Objective-C, like C, does not support pass by reference.

Like C, you can take the address of the variable and pass a pointer instead. And to manipulated the original variable in the function you would need to dereference the pointer.

answered Apr 25 '13 at 22:36

newacct

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Pass by reference in objective c

2 Answers2