为什么析构函数设为虚函数是必要的 析构函数应当都是虚函数,除非明确该类不做基类(不被其他类继承)。基类的析构函数声明为虚函数,这样做是为了确保释放派生对象时,按照正确的顺序调用析构函数。 #include <windows.h> #include <iostream> using std::cout; using std::endl; class CBase{ public: CBase(){ cout<<"CBase::CBase"<<endl;} virtual ~CBase(){ cout<<"CBase::~CBase"<<endl;} }; class CDerive:public CBase { public: CDerive(){ cout<<"CDerive::CDerive"<<endl;} ~CDerive(){ cout<<"CDerive::~CDerive"<<endl;} }; int main() { CBase* pBase = new CDerive(); delete pBase; system("pause"); return 0; } |
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来自: dongtongtong > 《C 基础》