On Dec 10, 2008, at 9:45 AM, Dave DeLong wrote:

Put the & before the variable type:

- (UInt32) traverseTreeStraightReturnedDirection: (&int)treeDirection...

I haven't tried that, but it doesn't look right. It doesn't correspond to any C or C++ syntax I've ever seen.


On Dec 10, 2008, at 8:43 AM, Nick Rogers wrote:

Hi,
I have the following in my .m file:


- (UInt32)traverseTreeStraightReturnedDirection:(int&)treeDirection
                          returnedTreeDepth:(int&)treeDepth
                                returnedKey:(HPlusCatalogKey&)catKey
                                 lookForKey:(HPlusCatalogKey)lastKey
{
// code here
}

But the error when compiling is "parse error before & token".
Is passing by reference not allowed or is there any other syntax that I should follow?

References are a language feature of C++. Neither C nor Objective-C has such a notion. You would have to use Objective-C++, which is usually accomplished by using a .mm extension for your source file.

Note that if you use C++ features in a header file, then all translation units which include that header will have to be C++ or Objective-C++, unless you conditionalize the code with "#ifdef __cplusplus".

Cheers,
Ken

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