C++中的多继承性,不同文件:“预期类名前”、“令牌”

我在maincontroller.h中得到这个错误“expected class name before”、“token”和“expected class name before”“token”。 我认为我包括了需要的文件,也在所有头文件中执行ifndef header定义header等操作,直到我编写了MainController类才有错误。 我不知道为什么会出现这个错误。我这里缺什么?

我有N4探险家签名。H:

class N4GestureRecognizer;
class N4GestureRecognizerDataSource{ /*it uses N4GestureRecognizer*/ };
class N4GestureRecognizerDelegate{    };
class N4GestureRecognizer {
...    
};

N4fingertipgesturerecognizer.h公司

#include "N4GestureRecognizer.h"
class N4FingerTipGestureRecognizer;

class N4FingerTipGestureRecognizerDelegate : public N4GestureRecognizerDelegate{
public:
    virtual void fingerTipGestureRecognizerCallback(N4FingerTipGestureRecognizer *recognizer) = 0;
};
class N4FingerTipGestureRecognizer : public N4GestureRecognizer{
...    
};

和主控制器。

#include "N4GestureRecognizer.h"
#include "N4FingerTipGestureRecognizer.h"

using namespace cv;

//******Error is in the next line******
class MainController : public N4GestureRecognizerDatasource, public N4FingerTipGestureRecognizeDelegate{ 
protected:
    Mat image;
public:
    /*virtual*/ Mat gestureRecognizerNeedsImageFrame(N4GestureRecognizer *recognizer);
    /*virtual*/ void fingerTipGestureRecognizerCallback(N4FingerTipGestureRecognizer *recognizer);

};