How to use c++ and objective-c together in XCode 4.2

Question

I had a trouble to combine c++ and objective-c together in developing a iphone app. I had a 3rd party library to use in the app. I had a plan to use c or c++ to wrap the library and then use objective-c to call it. After I had finished the class with c++, I had a trouble to use it in objective-c. Is there any sample code? Thanks.

in the objective-c head file. I write

#import <UIKit/UIKit.h>
#import "ZJTConstants.h"
#include "TTSAdapter.h"

class Adapter;
@interface ZJTVBlogViewController : UIViewController {
@private
    Adapter* adapter;
}
@end

and in the mm file, I write:

if (self) {
    adapter = Adapter::getInstance();
    // Custom initialization
}

Is it write?

Answer 1

In XCode there is a flag to compile all files as Objective-C++. I've used it to compile huge C++ libraries into iOS programs.

If you look at the "Build Settings" there is a place written "Compile Sources As". There is a dropdown menu there where you can select Objective-C++. In the clang/gcc commandline I think it is "-x objective-c++".