C++ 中的Virtual Function (虚函数) idec++ 1.C++ Virtual 用法 这里只讲语法,因为讲原理比较难。还没有涉及到构造函数。那么就直接上代码了: // VitualFunction.cpp : Defines the entry point for the console application. // #include "stdafx.h" #include <iostream> #include <vector> usingnamespacestd...
```cpp int main() { Base* b = new Derived(); b->display(); // 输出 "Derived display" delete b; return 0; } ``` 在这个例子中,尽管`b`是一个指向`Base`的指针,但由于`display`是虚函数,实际调用的是`Derived`类中的实现。 ### 纯虚函数(Pure Virtual Function)和抽象类 纯虚函数是一...
1 编译器会为这个类的虚函数添加一个虚表,类似下面的: // Pseudo-code (not C++, not C) for a static table defined within file Base.cpp // Pretend FunctionPtr is a generic pointer to a generic member function // (Remember: this is pseudo-code, not C++ code) FunctionPtr Base::__vtable[...
Flag function declarations that use more than one of virtual, override, and final. 提示使用virtual,override,final三个关键词的两个或三个的函数声明。 原文链接: https://github.com/isocpp/CppCoreGuidelines/blob/master/CppCoreGuidelines.md#c128-virtual-functions-should-specify-exactly-one-of-...
// deriv_VirtualFunctions2.cpp // compile with: /EHsc #include <iostream> using namespace std; class Base { public: virtual void NameOf(); // Virtual function. void InvokingClass(); // Nonvirtual function. }; // Implement the two functions. void Base::NameOf() { cout << "Base::Nam...
Flag function declarations that use more than one of virtual, override, and final. 提示使用virtual,override,final三个关键词的两个或三个的函数声明。 原文链接: https://github.com/isocpp/CppCoreGuidelines/blob/master/CppCoreGuidelines.md#c128-virtual-functions-should-specify-exactly-one-of-virtual-...
Example 1: C++ virtual Function #include<iostream>usingnamespacestd;classBase{public:virtualvoidprint(){cout<<"Base Function"<<endl; } };classDerived:publicBase {public:voidprint()override{cout<<"Derived Function"<<endl; } };intmain(){ Derived derived1;// pointer of Base type that points...
//Interface.cpp file //definition of a pure virtual destructor; should always be empty Interface::~Interface() {} What's the value of it? If it's pure, but it has to have a function body, what's the value of it? The only difference you'll see between the pure and non-pure virt...
//:objcut.cpp #include <iostream.h> class MyBase { public: void Get(){}; void Set(){}; public: int b; }; class DerivedMyBase: public MyBase { public: void Print(){}; void GetD(){}; }; main() { DerivedMyBase aDMB; ...
为了消除这种尴尬，让基类指针能够访问派生类的成员函数，C++ 增加了虚函数（Virtual Function）。使用虚...