在另一个文件中引用C++ struct对象？

Question

我正在努力让正在进行的游戏更加模块化.我希望能够在游戏中声明所有room_t对象的单个数组(room_t rooms []),将其存储在world.cpp中并从其他文件中调用它.

下面的截断代码不起作用,但就我所知.我想我需要使用extern但是无法找到一个正常工作的方法.如果我尝试在头文件中声明数组,我会得到一个重复的对象错误(因为每个文件都调用world.h,我假设).

main.cpp中

#include <iostream>
#include "world.h"

int main()
{
    int currentLocation = 0;
    cout << "Room: " << rooms[currentLocation].name << "\n";
    // error: 'rooms' was not declared in this scope
    cout << rooms[currentLocation].desc << "\n";    
    return 0;
}

world.h

#ifndef WORLD_H
#define WORLD_H
#include <string>


const int ROOM_EXIT_LIST = 10;
const int ROOM_INVENTORY_SIZE = 10;

struct room_t
{
    std::string name;
    std::string desc;
    int exits[ROOM_EXIT_LIST];
    int inventory[ROOM_INVENTORY_SIZE];
};  

#endif

world.cpp

#include "world.h"

room_t rooms[] = {
  {"Bedroom", "There is a bed in here.", {-1,1,2,-1} },
  {"Kitchen", "Knives! Knives everywhere!", {0,-1,3,-1} },
  {"Hallway North", "A long corridor.",{-1,-1,-1,0} },
  {"Hallway South", "A long corridor.",{-1,-1,-1,1} }
};

Answer 1

只需添加extern room_t rooms[];您的world.h文件即可.