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我尝试寻找解决方案，但找不到。

所以我有一个头文件items.h：

#ifndef ITEMS_H
#define ITEMS_H

#include <vector>

using std::vector;

int create_item();


class itemClass
{

public:

    short int xTile;
    short int yTile;

    bool playerHas;

    short int category;
    short int weaponCategory;


}extern vector<itemClass> items;


#endif

然后我在items.cpp哪里尝试使用这个向量create_item()：

#include "stdafx.h"
#include "SDL.h"
#include "items.h"
#include <vector>

using namespace std;


vector<itemClass> items;

int index = 0;

int create_item()
{
    //select category for the created item
    short int itemCategory = rand() % 3;

    switch(itemCategory)
    {
    case WEAPON:

        //increase weapons list by one
        items.resize(items.size() + 1);

        index = items.size();

        //set appropriate item category
        items.at(index).category = itemCategory;

        items.at(index).weaponCategory = rand() % 9;

        break;

     }

我遗漏了一些不重要的部分。无论如何，只要我不在标头中将向量声明为 extern，此代码就可以正常工作，而只是将其保留在本地。当我尝试这样做时，为什么会导致错误？

编辑：对不起，我忘了包括错误：

1>c:\users\aske\documents\c++\roguelike\roguelike\items.cpp(12)：错误 C2371：'items'：重新定义；不同的基本类型

1>
c:\users\aske\documents\c++\roguelike\roguelike\items.h(53) ：参见“项目”的声明

1>c:\users\aske\documents\c++\roguelike\roguelike\items.cpp(36): error C2228: left of '.resize' must have class/struct/union

1> 类型是'int'

1>c:\users\aske\documents\c++\roguelike\roguelike\items.cpp(36): error C2228: left of '.size' must have class/struct/union

1> 类型是'int'

1>c:\users\aske\documents\c++\roguelike\roguelike\items.cpp(38): error C2228: left of '.size' must have class/struct/union

1> 类型是'int'

1>c:\users\aske\documents\c++\roguelike\roguelike\items.cpp(41): error C2228: left of '.at' must have class/struct/union

1> 类型是'int'

1>c:\users\aske\documents\c++\roguelike\roguelike\items.cpp(41): error C2228: left of '.category' must have class/struct/union

1>c:\users\aske\documents\c++\roguelike\roguelike\items.cpp(43): error C2228: left of '.at' must have class/struct/union

1> 类型是'int'

1>c:\users\aske\documents\c++\roguelike\roguelike\items.cpp(43): error C2228: left of '.weaponCategory' must have class/struct/union

1>c:\users\aske\documents\c++\roguelike\roguelike\items.cpp(46): error C2228: left of '.at' must have class/struct/union

1> 类型是'int'

1>c:\users\aske\documents\c++\roguelike\roguelike\items.cpp(46): error C2228: left of '.weaponCategory' must have class/struct/union

1>c:\users\aske\documents\c++\roguelike\roguelike\items.cpp(47): error C2228: left of '.at' must have class/struct/union

1> 类型是'int'

1>c:\users\aske\documents\c++\roguelike\roguelike\items.cpp(47): error C2228: left of '.weaponCategory' must have class/struct/union

1>c:\users\aske\documents\c++\roguelike\roguelike\items.cpp(48): 错误 C2228: '.at' 的左边必须有类/结构/联合

1> 类型是'int'

1>c:\users\aske\documents\c++\roguelike\roguelike\items.cpp(48): error C2228: left of '.weaponCategory' must have class/struct/union

1>c:\users\aske\documents\c++\roguelike\roguelike\items.cpp(50): error C2228: left of '.at' must have class/struct/union

4

1 回答 1

1

您需要文件中的;before ，然后它应该编译 - 但您实际上不需要在 .h 文件中定义项目向量。externitems.h

于 2012-07-23T14:07:26.513 回答