LNK2019錯誤在C++

Question

我得到這個奇怪的鏈接錯誤：

Error 1 error LNK2019: unresolved external symbol "public: virtual __thiscall Data::~Data(void)" (??1Data@@UAE@XZ) referenced in function "public: virtual __thiscall Job::~Job(void)" (??1Job@@UAE@XZ) C:\...\Job.obj 

Error 2 error LNK2019: unresolved external symbol "public: __thiscall List::DataNode::DataNode(class List::DataNode const &)" (??0DataNode@List@@QAE@ABV01@@Z) referenced in function "public: __thiscall List::List(class List const *)" (??0List@@QAE@PBV0@@Z) C:\...\List.obj 

從第一個錯誤的描述，它可能是與析構函數。

我有一個純虛析構函數的空洞抽象的數據類：

virtual ~Data()=0; 

和一類工作，從數據得出，用簡單的實現析構函數：

Job::~Job() 
{ 
} 

燦你發現一個問題？我該如何解決它？ 謝謝！

Answer 1

您需要爲純虛擬析構函數提供定義。

C++ 03 12.4析構函數
第7段：

A destructor can be declared virtual (10.3) or pure virtual (10.4); if any objects of that class or any derived class are created in the program, the destructor shall be defined. If a class has a base class with a virtual destructor, its destructor (whether user- or implicitly- declared) is virtual.