C ++通过具有数组索引的类传递参数？

Question

class cat
{public:
  void dog(int ID, char *value) // int ID I'd like to be the index array it was called from?
  {
    debug(ID, value);
  }
}

cat cats[18];

cats[1].dog("value second arg, first arg auto filled from index array");

我想要类似的东西。

   include <vector>

class CatArray;

class Cat {
    // This line means that the CatArray class can 
    // access the private members of this class.
    friend class CatArray;

    private:
        static int ID;

    public:
        void dog(const char* value) {
            // Use ID here any way you want.
        }
};

int Cat::ID = 0;

class CatArray {
    private:
        std::vector<Cat> cats;
    public:
        explicit CatArray(unsigned int size) : cats(size) {}

        Cat& operator [](unsigned int index) {
            Cat::ID = index;
            return cats[index];
        }
};

但有点不同。一个游戏中有 18 个客户端，我基本上需要这样做。例如，“客户端 4 选择一个选项，然后通过数组索引调用该选项，然后客户端 4 将调用具有索引 4 的函数的函数”

Answer 1

那么cats[1] 并不是真正的Cat 对象而是CatWithIndex 对象：

class Cat {
public:
  void dog(size_t index,const char* value);
};

class CatWithIndex {
  size_t index_;
  const Cat &cat_;
public:
  CatWithIndex(size_t index, const Cat &cat): index_(index), cat_(cat) {}

  void dog(const char* value) {
    cat_.dog(index_,value);
  }
};

class CatArray {
private:
    std::vector<Cat> cats;
public:
    Cat& operator [](unsigned int index) {
        Cat::ID = index;
        return CatWithIndex(index,cats[index]);
    }
};