Functions with incorrect names: For example, if the virtual function in the base class is named print(), but we accidentally name the overriding function in the derived class as pint(). Functions with different return types: If the virtual function is, say, of void type but the function ...
Listing 6 和 图4共同例示了选择性地覆盖基类中的虚函数的效果。 Listing 6 Selective virtual overriding #include <iostream.h> class B { public: virtual void f(); virtual void g(); virtual void h(); }; class C : public B { public: void f(); // virtual }; class D : public C { ...
@文心快码looser exception specification on overriding virtual function 文心快码 在C++中,当重写(override)一个虚函数时,派生类中的函数不能拥有比基类函数更宽松的异常规范(exception specification)。 具体来说,如果基类的虚函数声明了可能抛出的异常类型(例如使用throw关键字),那么派生类中的重写函数必须遵守这个规范...
To edit an overriding function, double-click the name of the function in Class View and edit the code in the source window.To remove an override, click the override function name in the right column and select <delete>FuncName. The function's code is commented out.See...
Listing 6 Selective virtual overriding #include <iostream.h> class B { public: virtual void f(); virtual void g(); virtual void h(); }; class C : public B { public: void f(); // virtual }; class D : public C { public: ...
To edit an overriding function, double-click the name of the function in Class View and edit the code in the source window.To remove an override, select the override function name in the right column and select <delete>FuncName. The function's code is commented out.Pov...
virtual SubClass* afn()这个你要是把afn函数里面+个参数还可以实现一下函数的的重载 如果是你这样不能实现函数的重载,因为重载函数不以返回值来区分.把virtual SubClass* afn() 改为:virtual Base * afn()或者Base * afn()都可以 建议你去看一下虚函数的作用;
Listing 6 Selective virtual overriding #include <iostream.h> class B { public: virtual void f(); virtual void g(); virtual void h(); }; class C : public B { public: void f(); // virtual }; class D : public C { public: ...
because it overrides the one of the base. If the function print wasn't virtual, then the function in the derived wouldn't override the base function, but would merely hide it. Overriding can be usefulifyou have a function that accepts a baseclass, and every one that's derived from it:...
可以从 Visual Studio 属性窗口替代基类中定义的虚函数。 在属性窗口中替代虚函数: 在“类视图”中,选择类。 在“属性”窗口中,选择“替代”按钮。 备注 在“类视图”中选择类名或在源窗口中选择时,“替代”按钮才会显示。 左列列出了虚函数。 如果虚函数的名称还在右列中显示,则已实现替代。 如果函数没有替代...