vtkStandardNewMacro給出錯誤C4430：缺少類型說明

Question

我有以下代碼：

#include <vtkInteractorStyleTrackballCamera.h> 

class InteractorStyle : public vtkInteractorStyleTrackballCamera 
{ 
    public: 
     static InteractorStyle* New() {}; 
     vtkTypeMacro(InteractorStyle, vtkInteractorStyleTrackballCamera); 
     InteractorStyle() { 
      cout << "test"; 
     } 
     virtual void OnLeftButtonDown(); 

     virtual void OnKeyPress(); 

    private: 

}; 
vtkStandardNewMacro(InteractorStyle); //error here 

void InteractorStyle::OnLeftButtonDown() 
{ 
    std::cout << "test"; 
    // Forward events 
    vtkInteractorStyleTrackballCamera::OnLeftButtonDown(); 
}; 
void InteractorStyle::OnKeyPress() 
{ 
    // Get the keypress 
    vtkRenderWindowInteractor *rwi = this->Interactor; 
    std::string key = rwi->GetKeySym(); 

    // Output the key that was pressed 
    std::cout << "Pressed " << key << std::endl; 
    // Forward events 
    vtkInteractorStyleTrackballCamera::OnKeyPress(); 
}; 

即使我跟隨tutorial，它總是給我下面的錯誤vtkStandardNewMacro(InteractorStyle);：

錯誤C4430：失蹤類型說明符 - int假定。注：C++不支持 default-int

如何解決這個問題？

Answer 1

所有你需要添加的是#include <vtkObjectFactory.h>。該教程從未明確提到過，太糟糕了。