因为Base中包含虚函数表指针,所有size为4;Derived继承Base,只是扩充基类的虚函数表,不会新增虚函数表指针,所以size也是4;Derived_Virtual虚继承Base,根据前面的模型知道,派生类有自己的虚函数表及指针,并且有分隔符(0x00000000),然后才是虚基类的虚函数表等信息,故大小为4 4 4=12。 空类Empty: #pragma once cla...
所以pd的所有函数调用的结果都输出Derived::是完全正常的;pb的函数调用如果有virtual则根据多态性调用派生类的,如果没有virtual则是正常的静态函数调用,还是调用基类的,所以有virtual的f函数调用输出Derived::,其它两个没有virtual则还是输出Base::很正常啊,nothing surprise!
Base(){} virtual ~Base() {} }; class D : public Base { public : D(){} virtual ~D() {} }; int main() { //方式一:先初始化子类智能指针,然后调用dynamic_pointer_cast转换成基类智能指针对象 std::shared_ptr d1 = std::make_shared(); std::shared_ptr b1 = std::dynamic_pointer_c...
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class base; // as above class middle : private virtual base {}; class top : public virtual middle, private virtual bottom {}; void destroy(top *p) { delete p; } 多載的運算子 new 和運算子 delete 編譯器先前版本允許非成員 operator new 和非成員 operator delete 宣告為 static,以及在全域...
CBaseTransition(); CBaseTransition::Clear 释放封装的 IUIAnimationTransition COM 对象。 C++复制 voidClear(); 注解 应该从派生类的 Create 方法中调用此方法,以防止 IUITransition 接口泄漏。 CBaseTransition::Create 创建COM 转换。 复制 virtual BOOL Create( IUIAnimationTransitionLibrary* pLibrary, IUIAnimati...
The virtual keyword declares a virtual function or a virtual base class. virtual [type-specifiers] member-function-declarator virtual [access-specifier] base-class-name Parameters type-specifiers Specifies the return type of the virtual member function. ...
struct Base{//some stuffautoclone()const{returnstd::unique_ptr<Base>(clone_impl());}protected:virtual Base*clone_impl()const=0;};struct Derived:publicBase{//some stuffprotected:virtual Derived*clone_impl()constoverride{returnnewDerived(*this);};};struct Foo{std::unique_ptr<Base>ptr;//poin...
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