我在使用 vector 时得到一个 undefined reference 。
这里是错误:
/tmp/ccYnTr05.o: In function `TourManager::addCity(City)':
tsp.cpp:(.text._ZN11TourManager7addCityE4City[TourManager::addCity(City)]+0x1c): undefined reference to `TourManager::destinationCities'
/tmp/ccYnTr05.o: In function `TourManager::getCity(int)':
tsp.cpp:(.text._ZN11TourManager7getCityEi[TourManager::getCity(int)]+0x14): undefined reference to `TourManager::destinationCities'
/tmp/ccYnTr05.o: In function `TourManager::numberOfCities()':
tsp.cpp:(.text._ZN11TourManager14numberOfCitiesEv[TourManager::numberOfCities()]+0x5): undefined reference to `TourManager::destinationCities'
collect2: ld returned 1 exit status
这是代码片段:
class TourManager
{
private:
static vector<City> destinationCities;
public:
static void addCity(City city)
{
destinationCities.push_back(city);
}
static City getCity(int index)
{
return (City)destinationCities.at(index);
}
static int numberOfCities()
{
return (int)destinationCities.size();
}
};
我意识到vector还没有被初始化为一个值,但是vectors不是动态分配内存吗?我不确定如何解决这个未定义的引用问题?是 vector 问题还是其他问题?谢谢。
最佳答案
您只将 vector 声明为静态数据成员,但您还需要在类外定义它。例如
vector<City> TourManager::destinationCities;
关于c++ - vector 的 undefined reference ,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/20256335/