错误C2143和错误C4430 C ++ MS VS 2012 [英] error C2143 and error C4430 C++ MS VS 2012

问题描述

你好.我用C ++编写Conway Life游戏.我使用MVC模式.由于某种原因，我无法在模型和视图类中在控件的对象上创建指针.

Hello. I write Conway Life game on C ++. I use MVC pattern. For some reason I can not create the pointer on object of the controler in the class Model and View.

#ifndef _ConwayModels_H_
#define _ConwayModels_H_

#include <list>
#include "ConwayController.h"

class ConwayModels
{
public:
	ConwayModels();
	void update_state(const int n);
private:
	ConwayController *Controller; // ERROR!
	class cell
	{
		// live or dead
		bool state;

		// coordinates
		int x, y;
	};

	std::list<cell> live_with_neighbors;
};

#endif /* _ConwayModels_H_ */

#ifndef _ConwayViews_H_
#define _ConwayViews_H_

#include "IConwayViews.h"
#include "ConwayController.h"

class ConwayViews : public IConwayViews
{
public:
	ConwayViews();
	
	virtual ~ConwayViews();

	virtual void drow();

	virtual void set_cell(const int x, const int y);

	virtual void reset_cell(const int x, const int y);
private:
	ConwayController *Controller;
};

#endif /* _ConwayViews_H_ */

#ifndef _ConwayController_H_
#define _ConwayController_H_

#include "Parser.h"
#include "ConwayModels.h"
#include "ConwayViews.h"
#include <string>
#include <fstream>

class ConwayController
{
public:
	ConwayController() : default_input("input.txt"), default_output("output.txt") {};
	~ConwayController() {};

	// start reading and execution commands of game
	void start_game(const int argc, const char **argv);

	// read and execute next command
	void eval();
private:
	const char *default_input;
	const char *default_output;
	// built-in parcer (aggregation)
	ArgParser Parser;

	// communication with model and view (association)
	ConwayModels *Model;
	ConwayViews *View;

	// io files
	ifstream in;
	ofstream out;
};

#endif /* _ConwayController_H_ */

我在Microsoft Visual Studio 2012中编写代码.

I write a code in microsoft visual studio 2012.
Prompt please because of what it occurs?

推荐答案

乍一看:在类ConwayModels中，ConwayController字段是私有的，已声明但从未使用过.永远不会初始化(使用"new").

—SA

From the first glance: in the class ConwayModels, ConwayController field is private, declared but never used. It is never initialized (with "new").

—SA

对Contoller的循环依赖性. Model和View不了解真正的Conroller，仅了解Interface Controller.模型和视图可能会交叉.谢谢大家.

Cyclical dependence on a Contoller. Model and View do not know about real Conroller, only Interface Controller. The model and view shan''t be crossed. Thanks to all.

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