C ++继承和类的新实例

Question

我有以下标题和类：

game.h：

#include "GameStateManager.h"
class game
{
    //bunch of lines here
}

GameStateManager.h

#include "GameState.h"
class GameStateManager
{
    //bunch of lines here
}

GameState.h

class GameState
{
    //bunch of lines here
}

PlayState.h

#include "GameState.h"
class PlayState : public GameState
{
    //bunch of lines here
}

我需要在＆＃39; game.cpp＆＃39;中创建一个新的PlayState实例。我怎么能这样做？

Answer 1

假设您正在使用标题保护或#pragma once，只需：

#include "GameStateManager.h"
#include "PlayState.h"
class game
{
    PlayState play_state;
    //bunch of lines here
}