Objective-CとC++の機能の混在

http://developer.apple.com/jp/documentation/cocoa/conceptual/objectivec/Articles/chapter_12_section_3.html

class Hello {

private:

id _greeting_text; // NSStringを保持

public:

Hello() {

_greeting_text = @"Hello, world!";

}

Hello(const char* greeting_text) {

_greeting_text = [NSString stringWithUTF8String:greeting_text];

}

void say_hello() {

printf("%s\n", [_greeting_text UTF8String]);

}

};

@interface Greeting :NSObject {

@private

Hello *_hello;

}

- (id)init;

- (void)dealloc;

- (void)sayGreeting;

- (void)sayGreeting:(Hello*)greeting;

@end