未定義參考「PreconditionViolatedException :: PreconditionViolatedException（的std :: string常量＆）」

Question

我有一個可怕的時間與代碼項目，它由四個文件查找問題：

GiftRegistry.cpp：

#include "GiftRegistry.h" 
#include "LinkList/LinkedList.h" 
#include "LinkList/LinkedList.cpp" 
#include <iostream> 

template<class ItemType> 
GiftRegistry<ItemType>::GiftRegistry() : giftRegistry(new LinkedList<ItemType>()) 
{ 
} 

template<class ItemType> 
bool GiftRegistry<ItemType>::addGift(const ItemType& gift, int desiredRank) 
{ 
    if(giftRegistry->insert(desiredRank, gift)) 
    { 
     return true; 
    } 
    else{ 
     return false; 
    } 
} 

template<class ItemType> 
void GiftRegistry<ItemType>::moveGift(int curPos, int newPos) 
{ 
    if(giftRegistry->isEmpty()) 
    { 
     ItemType itemToMove = giftRegistry->getEntry(curPos); 

     if(giftRegistry->insert(newPos, itemToMove)) 
     { 
      cout << "Gift moved successfully!"; 
     } 
     if(giftRegistry->remove(curPos)) 
     { 
      cout << "Gift removed successfully"; 
     } 
     else{ 
      cout << "Operation failed. Please examine input."; 
     } 
    } 
} 

template<class ItemType> 
bool GiftRegistry<ItemType>::removeGift(int position) 
{ 
    if(giftRegistry->isEmpty()) 
    { 
     if(giftRegistry->remove(position)) 
     { 
      return true; 
     } 

    } 
    else 
    { 
     return false; 
    } 
} 

template<class ItemType> 
void GiftRegistry<ItemType>::showRegistry() 
{ 
    for(int i = 1; i < giftRegistry->getLength(); i++) 
    { 
     ItemType itemToPrint = giftRegistry->getEntry(i); 
     std::cout << i + "." + itemToPrint; 
    } 
} 

main.cpp中：

#include "GiftRegistry.cpp" 
//#include "LinkList/LinkedList.cpp" 
#include <iostream> 
#include <string> 

using namespace std; 

int main() 
{ 
    ListInterface<string>* listPtr = new LinkedList<string>(); 
    //RegistryInterface<string>* weddingRegistry = new GiftRegistry<string>(); 
    string gift = "hello there"; 
    listPtr->insert(1, gift); 
    cout << listPtr->getEntry(1); 
// string gift = "Box of rocks"; 
// 
// RegistryInterface<string>* weddingRegistry = new GiftRegistry<string>(); 
// if(weddingRegistry->addGift(gift, 1)) 
// { 
//  cout << "Added item " + gift; 
//  weddingRegistry->showRegistry(); 
// } 
// else 
// { 
//  cout << "Failed to add item. Error."; 
// } 
    //weddingRegistry->showRegistry(); 

    return 0; 
} 

GiftRegistry.h：

#ifndef Gift_Registry_ 
#define Gift_Registry_ 

#include "RegistryInterface.h" 
#include "C:\Users\Austin\Documents\LinkList\LinkedList.h" 
using namespace std; 

template<class ItemType> 
class GiftRegistry : public RegistryInterface<ItemType> 
{ 
private: 
    LinkedList<ItemType>* giftRegistry; 

public: 
    string CustomerName; 
    string EventName; 
    GiftRegistry(); 

    bool addGift(const ItemType& gift, int desiredRank); 
    void moveGift(int curPos, int newPos); 
    bool removeGift(int position); 
    void showRegistry(); 

    virtual ~GiftRegistry(); 
}; 

#endif // _GiftRegistry_ 

RegistryInterface.h：

#ifndef REGISTRY_INTERFACE_ 
#define REGISTRY_INTERFACE_ 

template<class ItemType> 
class RegistryInterface 
{ 
public: 
    /** Adds gift to the gift registry 
    @post Add was successful 
    @param gift The gift to be added to the registry. 
    @param giftRank The rank to be attributed to the gift. Also determines the point of insertion for the gift. 
    @return 'True' if addition was successful, 'false' if item already exists in the list 
    **/ 
    virtual bool addGift(const ItemType& gift, int giftRank) = 0; 

    /** Moves the gift to the user-desired location/priority 
    @pre List is not empty 
    @param currentPosition The current position of the gift to be moved. 
    @param desiredPosition The new position 
    **/ 
    virtual void moveGift(int currentPosition, int desiredPosition) = 0; 

    /** Removes the specified item from the List 
    @pre List is not empty 
    @post Item was removed 
    @param position The index of the item to be removed 
    @return 'True' if gift was removed, 'False' if not 
    **/ 
    virtual bool removeGift(int position) = 0; 


    /** Prints the registry contents and displays them by most wanted to least wanted 
    @pre List is not empty 
    **/ 
    virtual void showRegistry() = 0; 

    /** Destroys this registry and frees its assigned memory. 
    **/ 
    virtual ~RegistryInterface() { } 
}; 
#endif // REGISTRY_INTERFACE_ 

我使用的代碼:: Blocks的16.01，堅持C++ 11級的標準。運行'main.cpp'文件時出現問題，導致出現以下錯誤：

|| ===構建：DebugList（編譯器：GNU GCC編譯器）=== | obj \ Debug \ main.o ||在函數ZNK10LinkedListISsE8getEntryEi':| C:\Users\Arralan\Documents\LinkList\LinkedList.cpp|121|undefined reference to PreconditionViolatedException :: PreconditionViolatedException（std :: string const &）'| obj \ Debug \ main.o ||在函數中ZN10LinkedListISsE7replaceEiRKSs':| C:\Users\Arralan\Documents\LinkList\LinkedList.cpp|140|undefined reference to PreconditionViolatedException :: PreconditionViolatedException（std :: string const &）'| ||錯誤：ld返回1退出狀態| || ===構建失敗：3個錯誤，0個警告（0分（s），0秒（s））=== |

我是數據結構的新手，這個問題已經讓我掛了兩天了。任何幫助或指導將不勝感激，但請記住，這是一項家庭作業。

「LinkList」中的代碼沒有錯誤並且按照預期在其單獨項目中運行，但在從其他項目引用時表現異常。我相信這個問題可能與我的'#include'語句有關。

編輯：問題是由這個獨特的實例中必需的'#include'造成的。我發現的解決方案，不管是否最好，都是通過'#include'添加此路徑：「LinkList/PreconditionViolatedException.cpp」。將此行添加到我的'main.cpp'後，錯誤已停止顯示。

Answer 1

該問題是由這個獨特實例中必需的#include引起的。我發現的解決方案，不管是否最好，都是通過'#include'添加此路徑：「LinkList/PreconditionViolatedException.cpp」。將此行添加到我的'main.cpp'後，錯誤已停止顯示。