重新启动游戏并重新启动对象 [英] Restarting a game and reinstantiate objects

问题描述

简介

我在C ++中创建一个小游戏，并且想创建一个函数来重新启动游戏。

首先我创建对象 player 。然后我有一个if语句来确定某个键是否被按下来调用 New（）方法。

我的目标

在该方法中，我想重新展示

<$>

p $ p> 玩家;

//新游戏方法
Game :: New（）
{
player = new Player（）;
}

//游戏循环
Game :: Loop（）
{
if（keyispressed（key））
{
Game.New（）;
}
}


有任何建议吗？

解决方案

你混淆指针和非指针变量。 new Player（）返回动态分配的 Player 对象的地址。您不能将此地址分配给非指针变量 player ;您需要将 player 声明为指针：

  player = new Player（）; 
  

您还需要记住释放先前使用匹配的 delete ：

  //播放器开始指向没有
 Player * player = 0; 
 
 //新游戏方法
 Game :: New（）
 {
 //如果玩家已经指向某个内容，释放该内存
 if播放器）
删除播放器; 
 
 player = new Player（）; 
} 
  

现在玩家是一个指针，你必须更新任何其他使用player的代码，使用 - > 成员访问操作符。例如， player.name（）将成为 player-> name（）

Introduction

I am creating a small game in C++ and would like to create a function to restart the game.

First I am creating the object player. Then I have an if statement to determine when a certain key is pressed to call the New() method.

My goal

In that method I would like to reinstantiate an object of the Player class, so all variables will be resetted.

My code:

Player player;

//New game method
Game::New()
{
    player = new Player();
}

//Game loop
Game::Loop()
{
    if(keyispressed(key))
    {
        Game.New();
    }
}

Any suggestions?

解决方案

You're confusing pointer and non-pointer variables. new Player() returns the address of a dynamically allocated Player object. You cannot assign this address to the non-pointer variable player; you'd need to declare player as a pointer:

Player* player = new Player();

You also need to remember to release the memory previously allocated with a matching delete:

// player starts out pointing to nothing
Player* player = 0;

//New game method
Game::New()
{
    // If player already points to something, release that memory
    if (player)
        delete player;

    player = new Player();
}

Now that player is a pointer you'll have to update any other code you've written which uses player, to use the -> member access operator. For example, player.name() will become player->name()

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