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  1. PO
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    <p>Sure -- you can do this. The main thing that's required is to set the .CPP file as "Objective-C++ Source" -- the ".mm" convention is an automagic nicety, but not required. You can then mix and match pretty much as you please:</p> <pre><code>#import &lt;Foundation/Foundation.h&gt; #include &lt;iostream&gt; @interface iCloudUtil : NSObject @property(nonatomic, assign, getter=isAvailable) BOOL iCloudIsAvailable; @property(assign) NSString *urlToFile; - (bool) init_iCloud; - (void) loadDocument:(NSString*)fileUrl; @end ////////////////////////////////////////////////////// @implementation iCloudUtil @synthesize urlToFile = _urlToFile; @synthesize iCloudIsAvailable = _iCloudIsAvailable; - (bool) init_iCloud { NSLog(@"init_iCloud"); std::cout &lt;&lt; "i can mix std c++ in here as well\n"; return YES; } - (void) loadDocument:(NSString*)fileUrl { NSLog(@"url is %@",fileUrl); } @end ////////////////////////////////////////////////////// class ICloudInterface { static ICloudInterface* _instance; bool iCloudIsAvailable; iCloudUtil* myCloudUtil; public: ICloudInterface(); ~ICloudInterface(); bool init_iCloud(); }; ICloudInterface::ICloudInterface() { std::cout &lt;&lt; "ICloudInterface::ctor\n"; myCloudUtil = [[iCloudUtil alloc] init]; [myCloudUtil init_iCloud]; [myCloudUtil loadDocument:@"file://foo/bar/baz"]; } ICloudInterface::~ICloudInterface() { [myCloudUtil release], myCloudUtil = nil; std::cout &lt;&lt; "ICloudInterface::dtor\n"; } int main(int argc, const char * argv[]) { std::cout &lt;&lt; "Test objc/objc++\n"; ICloudInterface iface; return 0; } </code></pre>
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    1. POUsing an Objective-C Class in C++
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    1. COSince Objective-C++ has a few incompatibilities with normal C++ and takes longer to couple, it *might* not be desirable to switch a whole codebase over like that.
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    2. COI agree--wasn't necessarily suggesting that. In my little example I changed the main to ObjC++, but you can certainly do it on a module-by-module basis as well -- I do that all the time.
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