C メンバー関数内から Objective-C メソッドを呼び出すにはどうすればよいですか?

int MyObjectDoSomethingWith(void *myObjectInstance, void *parameter) {
    // Call the Objective-C method using Objective-C syntax
    return [(id)myObjectInstance doSomethingWith:parameter];
}

@interface MyObject : NSObject
{
    int someVar;
}

- (int)doSomethingWith:(void *)aParameter;
@end

int MyCPPClass::someMethod(void *objectiveCObject, void *aParameter) {
    // Invoke the Objective-C method using the C trampoline function
    return MyObjectDoSomethingWith(objectiveCObject, aParameter);
}

// MyClassImpl.h (Private Implementation)
class MyClassImpl {
private:
    void *self;
};

// MyObject (Objective-C)
@interface MyObject : NSObject
{
    int someVar;
}

- (void)logMyMessage:(char *)aCStr;
@end

// MyCPPClass (C++)
class MyCPPClass {
private:
    MyClassImpl * _impl;
};

void MyCPPClass::doSomething() {
    _impl->logMyMessage("Hello from C++!");
}