c++ read access violation with extended classes [closed] - c++

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As the title says when I run my program, visual studio, give me that error. The class that produce that error is the following:
class UsesScene {
BaseScene & scene;
public:
UsesScene(BaseScene& scene) : scene(scene) {}
void Start() { scene.Start(); }
void EventHandler(SDL_Event ev) { scene.EventHandler(ev); }
void Update() { scene.Update(); }
void Draw(SDL_Renderer* renderer) { scene.Draw(renderer); }
};
The popup appears after } at the end of the initialization of the Start void.
Another code that can interact with these classes is the following:
void GameManager::regScene(UsesScene scene) {
if (display != NULL) {
UsesScene* ptr = &scene;
UsesScene** pptr = &ptr;
display = *pptr;
}
else
{
UsesScene* ptr = &scene;
UsesScene** pptr = &ptr;
buffer = *pptr;
}
}
the display & buffer are declared as
class GameManager
{
private:
SDL_Window* window;
SDL_Renderer* renderer;
UsesScene* display;
UsesScene* buffer;
bool isRunning;
bool reStart;
};
and for access to the display or buffer's parameter I use the following syntax:
display->Start();
and the last thing that has to do with this class is this part of code:
TestScene tScene;
UsesScene testScene(tScene);
this->regScene(testScene);
Test Scene simply extends BaseScene:
class BaseScene
{
private:
bool sceneloop = false;
public:
virtual void Start() { std::cout << "BasceScene::Start()" << std::endl; };
virtual void EventHandler(SDL_Event event) {};
virtual void Update() {};
virtual void Draw(SDL_Renderer* renderer) {};
void _toggleLoopMode() { sceneloop = !sceneloop; }
bool _sceneloop() { return sceneloop; }
};
How I can solve this?
ps:
some code that doesn't interfere with the Display and Buffer wasn't reported, if you need: free to ask

Answer 1

So, after a few hours of coding, thanks to Remy Lebeau, I've finally resolved this issue.
First I've changed the regScene() method and now looks like this:
void GameManager::regScene(UsersScene *scene) {
if (SceneManager::_display == NULL)
_display = scene;
else
_buffer = scene;
}
And then I pass the scene like this:
TestScene tScene;
UsersScene testScene(tScene);
sManager->regScene(&testScene);
Thanks to all.