C++ 未知类型名称，即使类型是通过标头定义的

Question

This is driving me insane, I have a class called Model, a class called View, and a header file for something GameCommand. I've included the right header guards and everything as far as I can tell but I keep getting an unknown type name error

Model.h

#ifndef MODEL_H
#define MODEL_H

class Model
{
public:
    Model(); //default constructor
};

#endif

Model.cpp

#include "Model.h"
#include <iostream>
using namespace std;

Model::Model() //default constructor
{
whatever
}

View.h

#ifndef VIEW_H
#define VIEW_H

class View
{
public:
    View(); 
};

#endif

View.cpp

#include "View.h"
#include <iostream>
using namespace std;

View::View()
{ whatever
}

GameCommand.h

#ifndef GAMECOMMAND_H
#define GAMECOMMAND_H
#include "Model.h"
#include "View.h"

void DoGoCommand(Model&, View&);

error: unknown type name 'Model'
void DoGoCommand(Model&, View&);
                 ^
error: unknown type name 'View'
void DoGoCommand(Model&, View&);
                         ^

I feel like I've tried everything, is there something I am just not seeing here?

Answer 1

You can try to forward declare the classes.

class Model;

class View;

in your GameCommand.h