c++ - Virtual destructor of abstract class fix is fuzzy -

i have abstract class , errors when try delete instance of class.

class ccobjectbase { public:     ccobjectbase();     virtual ~ccobjectbase();      virtual void createpainterpath() = 0; };  class ctriangle : public ccobjectbase { public:     ctriangle();     ~ctriangle();     void createpainterpath();   };  ccobjectbase :: ~ccobjectbase(){} 

i create object bellow:

std::vector<ccobjectbase *> m_objectbaselist;  m_objectbaselist.push_back(new ctriangle());  //do stuff m_objectbaselist  delete m_objectbaselist.at(index); m_objectbaselist.erase(m_objectbaselist.begin() + index); 

i retrieve error @ ~ctriangle() "undefined reference ccobjectbase :: ~ccobjectbase()". if delete virtual destructor ccobjectbase warning "deleting object of abstract class type ccobjectbase has non-virtual destructor cause undefined behavior" annoying fix cause more problems.

update: kind of stupid tried run qmake -> rebuild , nothing happen when restart app there no errors or warnings displayed. why works now? not know.

your method

virtual ~ccobjectbase(); 

is undefined. declared, didn't provide definition. c++11 can change declaration

virtual ~ccobjectbase() = default; 

for empty definition.