};// Driver Codeintmain(){cout<< boolalpha;cout<<"has_virtual_destructor:"<<endl;cout<<"int:"<<has_virtual_destructor<int>::value <<endl;cout<<"gfg1:"<<has_virtual_destructor<gfg1>::value <<endl;cout<<"gfg2:"<<has_virtual_destructor<gfg2>::value <<endl;cout<<"gfg3:"<<has_...
在用基类指针指向派生类时, 在基类析构函数声明为virtual的时候,delete基类指针,会先调用派生类的析构函数,再调用基类的析构函数。 在基类析构函数没有声明为virtual的时候,delete基类指针,只会调用基类的析构函数,而不会调用派生类的析构函数,这样会造成销毁对象的不完全。 如果觉得我的文章对您有用,请随意打赏。
virtualstringgetDeptName(); }; Worker * worker =NULL; worker =newEmployee(1,"name",1); deleteworker;//这里不行,报错:Delete called on 'Worker' that is abstract but has non-virtual destructor 解决方案: virtual~Worker(){}// 在基类加上虚析构函数 ...
警告解决办法:class xxxx has virtual method but non-virtual destructor,警告尽量去掉。有虚函数(纯虚函数),就要有虚析构函数。如下所示:classElement{public:virtual~Element(){//}virtualboolread()=0;virtualboolwrite()=0;};...
警告:deleting object of polymorphic class type 'XXX' which has non-virtual destructor might cause u... 原来如果基类里有虚函数,定义了基类指针指向派生类,就会需要定义基类虚析构,这样,基类指针析构的时候,就会先析构派生类,再析构基类。 如果不定义虚析构,就会基类指针直接析构基类。这样派生类对象销毁不...
virtual~Animal() =default; to your animal class. Abaseclass destructor should be either public and virtual, or protected and non-virtual Cpp Core Guidelines As for the second issue, the double delete: deleteanimal;// deletes the objectdeletecat;// deletes the same object a...
You cannot safely use a pointer to the base class, unless it has a virtual destructor declared on the base class. Since this is a vendor library, you can not add the virtual destructor needed. If the library itself does not create subclasses of this object, you may be ...
} virtual void f(){ cout<<"ok1"<<endl; } }; class derived:public based{ public: ~derived(){ cout<<"flag 2"<<endl; } void f(){ cout<<"ok2"<<endl; } }; int main(){ based* p = new derived(); p->f(); delete p; ...
Virtual destructors are only required when a pointer has type (Base *) and points to an object of type (Foo *) where Foo is a sub-class of Base. The warnings obtained by enabling the -Wdelete-non-virtual-dtor flag do not reflect this. Instead they warn you whenever you delete a (Ba...