C++类中的构造函数
C++类中的构造函数
提问于 2018-06-08 08:51:28
我有两个类，Player和Game。
class Game
{
private:
int maxPlayer;
Player** playersArray;
public:
Game(int maxPlayer);
~Game();
}playersArray中的每个索引都由指向类Player.The的指针组成，因为构造函数不起作用，因为以下消息不断出现：
error: invalid use of 'Player::Player' playersArray[i]->Player();
Game::Game(int maxPlayer)
{ this->maxPlayer=maxPlayer;
this->playersArray = new Player*[maxPlayer];
for(int i=0;i<maxPlayer;i++)
{
playersArray[i]->Player();
}
}这是类播放器：
class Player {
private:
char* player_name;
int level;
int life;
int strength;
Weapon player_weapon;
int place;
}我的目标是将player_name设置为NULL，而不是设置为内存中的任意位置。这就是Player()应该做的事情。
回答 1
Stack Overflow用户
回答已采纳
发布于 2018-06-08 09:04:14
您没有正确填充Game数组。您正在尝试调用Player()构造函数，就好像它是一个常规的类方法(它不是)，更糟糕的是，您正在通过一个未初始化的Player*指针调用它。
您需要改用new运算符，例如：
class Game
{
private:
int maxPlayers;
Player** playersArray;
public:
Game(int aMaxPlayers);
~Game();
}
Game::Game(int aMaxPlayers)
{
maxPlayers = aMaxPlayers;
playersArray = new Player*[maxPlayers];
for(int i = 0; i < maxPlayers; ++i)
playersArray[i] = new Player; // <-- here
}
Game::~Game()
{
for(int i = 0; i < maxPlayers; ++i)
delete playersArray[i];
delete[] playersArray;
}更安全的选择是使用std::unique_ptr而不是原始指针：
#include <memory>
class Game
{
private:
int maxPlayers;
std::unique_ptr<std::unique_ptr<Player>[]> playersArray;
public:
Game(int aMaxPlayers);
}
Game::Game(int aMaxPlayers)
{
maxPlayers = aMaxPlayers;
playersArray = std::make_unique<std::unique_ptr<Player>[]>(maxPlayers);
for(int i = 0; i < maxPlayers; ++i)
playersArray[i] = std::make_unique<Player>();
}也就是说，当Player*对象数组就足够时，不需要使用Player指针数组：
class Game
{
private:
int maxPlayers;
Player* playersArray;
public:
Game(int aMaxPlayers);
~Game();
}
Game::Game(int aMaxPlayers)
{
maxPlayers = aMaxPlayers;
playersArray = new Player[maxPlayers];
}
Game::~Game()
{
delete[] playersArray;
}或者：
#include <memory>
class Game
{
private:
int maxPlayers;
std::unique_ptr<Player[]> playersArray;
public:
Game(int aMaxPlayers);
}
Game::Game(int aMaxPlayers)
{
maxPlayers = aMaxPlayers;
playersArray = std::make_unique<Player[]>(maxPlayers);
}然后，您可以使用std::vector来进一步简化：
#include <vector>
class Game
{
private:
std::vector<Player> playersArray;
public:
Game(int maxPlayers);
}
Game::Game(int maxPlayers)
: playersArray(maxPlayers)
{
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/50751933
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