尝试创建我的类的新对象时发生链接错误C++

Question

我试图通过创建SingleLinkedList的对象SingleLinkedList m1;来测试我的程序。如果我不创建和操作对象，它编译得很好。这是我的主：

int main() 
{ 
    SingleLinkedList m1; 
    displayMenu(); 
    int user_menu; 
    cin >> user_menu; //get input from user which pocket they want to go to 
    while (user_menu != 4) 
    { 
     displayChoices(); 
     int user_input; // 
     cin >> user_input; 
     if (user_input == 1) { 
      cout << "You selected the Pocket Of Magic!" << endl; 
      cout << "What do you choose to do?" << endl; 
      //string user_choice; 
      //cin >> user_choice; 
      //SingleLinkedList m1; 
      m1.operationMagic();  
     } 
     else if (user_input == 2) { 
      cout << "You selected the Pocket Of Potions!" << endl; 
      cout << "What do you choose to do?" << endl; 
     } 

    user_input = 4; 
    } 
    displayMenu(); 

然而，当我尝试链接，出现此错误：

Undefined symbols for architecture x86_64: 
    "SingleLinkedList::SingleLinkedList()", referenced from: 
     _main in pocketmaindriver-df9a60.o 
    "SingleLinkedList::~SingleLinkedList()", referenced from: 
     _main in pocketmaindriver-df9a60.o 
ld: symbol(s) not found for architecture x86_64 
clang: error: linker command failed with exit code 1 (use -v to see invocation) 

是什么原因呢？我试着包括.cpp文件以及和没有work.Here是我的.h文件进行比较：

#ifndef POCKET_OF_MAGIC_ 
#define POCKET_OF_MAGIC_ 

//using namespace std; 


class SingleNode { 
private: 
    std::string value; 
    SingleNode *nextNode; 
public: 
    SingleNode(); 
    SingleNode(std::string s); 
    std::string getValue(); 
    SingleNode* getNextNode(); 
    void setNextNode(SingleNode *newNode); 
}; 


class SingleLinkedList { 
private: 
    SingleNode *head; 
    SingleNode *tail; 
    int totalNodes; 
    int itemCount; 
public: 
    SingleLinkedList(); 
    ~SingleLinkedList(); 
    void traverseAndPrint(); 
    void addNode(std::string data); 
    bool deleteNode(std::string data); 
    void operationMagic(); 

}; //end pocket of magic 

#endif //end pocket of magic 

Answer 1

你没有告诉你的类的.cpp文件编译器。您需要执行如下操作：g++ PocketOfMagic.cpp pocketmaindriver.cpp -o my_program