动态初始化对象
我有一个名为“玩家”的向量和一个名为“玩家”的类。我想做的是写：
players.push_back(Player(name, Weapon(bullets)));
所以我希望能够在循环中创建玩家。但我看到一条错误消息说“没有匹配的函数来调用 Player::Player...”
然后我将其更改为：
Weapon w(bullets);
Player p(name, w);
players.push_back(p);
这是我的 Player 定义：
class Player {
public:
Player(string &name, Weapon &weapon);
private
string name;
Weapon weapon;
}
我只是想了解这些定义之间的区别。这是将对象传递给对象构造函数的正确方法吗？
注意：这些不是我实际的类定义。我只是想通过编写代码来学习一些有关 C++ 中面向对象编程的知识。我的意思是我知道武器可以在 Player 中初始化:)
I have a vector called players and a class called Player. And what I'm trying to do is to write:
players.push_back(Player(name, Weapon(bullets)));
So I want to be able to create players in a loop. But I see an error message says "no matching function for call Player::Player..."
Then I've changed that to:
Weapon w(bullets);
Player p(name, w);
players.push_back(p);
Here is my Player definition:
class Player {
public:
Player(string &name, Weapon &weapon);
private
string name;
Weapon weapon;
}
I'm just trying to learn what is the difference between these definitions. And is this the right way to pass an object to an object constructor.
Note: These are not my actual class definitions. I'm just trying to learn something about object oriented programming in C++ with coding it. I mean I know that Weapon can be initialized in Player :)
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将构造函数更改为：
或：
使用临时对象初始化引用是无效的 C++，而这正是您在使用时所做的事情：
不过，使用
const引用是合法的。编辑：您还应该将名称作为
const引用或按值传递。Change constructor to:
or:
It's not valid C++ to initialize a reference with a temporary object, which is what you're doing when you use:
it's legal to use a
constreference though.EDIT: You should also pass name as a
constreference or by value.您将一个临时 (
Weapon(bullets)) 传递给Player构造函数，该构造函数采用Weapon &。但由于不允许您引用临时对象，因此此操作会失败。但是，您可以对临时对象进行常量引用。因此，重新声明您的构造函数，如下所示：
You are passing a temporary (
Weapon(bullets)) to thePlayerconstructor, which takes aWeapon &. But since you're not allowed to make a reference to a temporary, this fails.You are, however, allowed to make a const reference to a temporary. Thus, redeclare your constructor as follows: