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网站建设需要微信账号和密码,医院网站模板,深圳免费做网站,中国互联网百强企业排名一、多态的概念多态顾名思义就是多种形态#xff0c;它分为编译时的多态#xff08;静态多态#xff09;和运行时的多态#xff08;动态多态#xff09;#xff0c;编译时多态#xff08;静态多态#xff09;就是函数重载#xff0c;模板等#xff0c;通过不同的参数…一、多态的概念多态顾名思义就是多种形态它分为编译时的多态静态多态和运行时的多态动态多态编译时多态静态多态就是函数重载模板等通过不同的参数来完成对不同的函数的调用即生成多种形态并且这个过程在编译阶段就已经完成。动态多态是在运行时根据对象的实际类型来确定调用函数的哪个版本完成不同的⾏为。二、多态构成条件1.虚函数在类成员函数的返回类型前面添加virtual关键字即为虚函数注意虚函数只能定义于普通成员函数构造函数以及类外函数不能定义虚函数。2.虚函数的重写虚函数重写指的是子类派生类对父类基类的重写。重写的要求是子类虚函数的返回值函数名参数类型必须和父类一模一样。但函数的实现逻辑不用相同。这里如果虚函数的重写没有加virtual但是父类加了virtual那么子类依旧保持virtual的性质也可构成重写。注意对虚函数重写并没有要求缺省参数要相同但在这里强烈建议把缺省参数设为相同值要不然会给你带来很大的弊端和误导性。接下来我会讲到。3.调用方式要实现多态效果第⼀必须是基类的指针或引⽤因为只有基类的指针或引⽤才能既指向派⽣类对象又能指向基类第⼆派⽣类必须对基类的虚函数重写/覆盖重写或者覆盖了派⽣类才能有不同的函数多态的不同形态效果才能达到。⽐如火车买票这个操作当普通⼈买票时是全价买票学⽣买票时是优惠买票军⼈买票时是优先买票我们就可以用多态来实现如下代码语言javascriptAI代码解释#includeiostream using namespace std; class ticket { public: virtual void func() { cout 普通票 endl; } private: }; class student:public ticket { public: virtual void func() { cout 学生票 endl; } private: }; void fm(ticket pu) { pu.func(); } int main() { ticket tk; student stu; fm(tk); fm(stu); return 0; }4.override和final的修饰override关键字因为多态的实现细节要求太多了特别是对虚函数的重写因此C11提供了override可以帮助⽤⼾来检查虚函数的重写是否正确需要放在重写的函数参数列表后面。final关键字如果不想子类对该虚函数进行重写的话就可以使用final关键字放在函数名后面。5.协变刚才我们说了虚函数的重写一定要满足子类虚函数的返回值函数名参数类型必须和父类相同。协变是个例外情况。当子类重写父类虚函数时若与父类虚函数返回值类型不同即父类虚函数返回父类对象的指针或引用子类虚函数返回子类对象的指针或引用此时称为协变。协变的实际意义并不⼤所以我们了解⼀下即可。代码示例代码语言javascriptAI代码解释class A{}; class B :public A{}; class ticket { public: virtual ticket* func()//ticket也可以是A { cout 普通票 endl; return this; } private: }; class student:public ticket { public: virtual student* func() override//student也可以是B { cout 学生票 endl; return this; } private: };析构函数的重写父类的析构函数为虚函数此时派⽣类析构函数只要定义⽆论是否加virtual关键字都与基类的析构函数构成重写虽然基类与派⽣类析构函数名字不同看起来不符合重写的规则实际上编译器对析构函数的名称做了特殊处理编译后析构函数的名称统⼀处理成destructor所以基类的析构函数加了vialtual修饰派⽣类的析构函数就构成重写。代码语言javascriptAI代码解释A* p1 new A; A* p2 new B; delete p1; delete p2;假设B是A的子类上⾯的代码如果~A()不加virtual那么delete p2时只调⽤A的析构函数没有调⽤B的析构函数就会导致内存泄漏问题。三、纯虚函数和抽象类在虚函数的参数列表后⾯写上0则这个函数为纯虚函数纯虚函数不需要定义实现(实现没啥意义因为要被子类重写但是语法上可以实现)只要声明即可。包含纯虚函数的类叫做抽象类抽象类不能实例化出对象如果子类继承后不重写纯虚函数那么子类也是抽象类。纯虚函数某种程度上强制了子类重写虚函数因为不重写实例化不出对象。四、多态原理在分析对象的储存空间时我们讲过对于同一个类实例化出的不同对象这些对象使用的函数都是相同的不同的是它们成员变量。所以每个对象只需要对成员变量进行储存不用对成员函数进行储存每一个对象使用的都是这个类的公共成员函数。c为虚函数单独设立了一块区域来储存虚函数的地址叫做虚表而这块区域其实 就是一个函数指针数组。即用来储存函数指针的一个数组。那么父类和子类就各自有一个虚表在对象实例化的时候就会隐含隐含类似于成员函数里面看不见的this指针一样着一个指针——虚表指针来指向虚表。代码语言javascriptAI代码解释#includeiostream using namespace std; class A { public: virtual void func(){} }; class B { public: void func(){} }; int main() { A a; B b; cout a: sizeof(a) endl; cout b: sizeof(b) endl; return 0; }而虚表指针也是需要占用空间的大家可以自行地去运行一下以上代码输出结果为a4(或8即32位与64位机器的区别)b1所以在调用对象的虚函数时就跟以什么类型的形式调用无关而是跟这个对象实例化时具体类型有关。代码语言javascriptAI代码解释#includeiostream using namespace std; class ticket { public: virtual void func() { cout 普通票 endl; } }; class student :public ticket { public: virtual void func() { cout 学生票 endl; } }; int main() { ticket* tk new student; tk-func(); return 0; }以上的输出结果是“学生票”。注意根据切片原理子类可强制类型转化为父类父类不能强制类型转化为子类。五、练习以下程序输出结果是什么A:A-0B:B-1C:A-1D:B-0E:编译出错F:以上都不正确这里虽然B类的func成员没有写virtual关键字但它是由A继承下来的依旧保留virtual的性质然后因为重写并为要求参数的缺省值相同所以这里构成函数的重写。再来看主函数mainp调用了test而test是A的成员函数隐含了一个const A* this指针的参数类型p传到test函数满足多态所以这里调用的是B的func。但是这里有个坑该题的输出结果并不是“B-0”而是“B-1”。要注意重写只是重写了函数的实现也就是说实现多态的时候相当于调用的是父类的接口声明和子类的函数实现而并不关心子类的函数接口声明。所以在我们自己写虚函数的时候最好把缺省参数设为相同值要不然会给你带来很大的误导性。m.a2myg.pro/Blog/u6e88.shtmm.a2myg.pro/Blog/ycak4.shtmm.a2myg.pro/Blog/68q08.shtmm.a2myg.pro/Blog/qiycg.shtmm.a2myg.pro/Blog/gyywe.shtmm.a2myg.pro/Blog/y2cg2.shtmm.a2myg.pro/Blog/qucw2.shtmm.a2myg.pro/Blog/qscac.shtmm.a2myg.pro/Blog/uegy2.shtmm.a2myg.pro/Blog/2wweo.shtmm.a2myg.pro/Blog/coiaw.shtmm.a2myg.pro/Blog/0so86.shtmm.a2myg.pro/Blog/wg2ia.shtmm.a2myg.pro/Blog/g26us.shtmm.a2myg.pro/Blog/uayem.shtmm.a2myg.pro/Blog/x1xpr.shtmm.a2myg.pro/Blog/p33z9.shtmm.a2myg.pro/Blog/tb557.shtmm.a2myg.pro/Blog/2c06m.shtmm.a2myg.pro/Blog/0a02s.shtmm.a2myg.pro/Blog/082se.shtmm.a2myg.pro/Blog/91vzd.shtmm.a2myg.pro/Blog/mzami.shtmm.a2myg.pro/Blog/4c0e4.shtmm.a2myg.pro/Blog/8ss6u.shtmm.a2myg.pro/Blog/3jv57.shtmm.a2myg.pro/Blog/93x7r.shtmm.a2myg.pro/Blog/i6oey.shtmm.a2myg.pro/Blog/tlr53.shtmm.a2myg.pro/Blog/cyms0.shtmm.a2myg.pro/Blog/qi4ig.shtmm.a2myg.pro/Blog/4iu80.shtmm.a2myg.pro/Blog/8uyug.shtmm.a2myg.pro/Blog/6muqs.shtmm.a2myg.pro/Blog/w6kmq.shtmm.a2myg.pro/Blog/rjfp3.shtmm.a2myg.pro/Blog/wem8e.shtmm.a2myg.pro/Blog/2e4s4.shtmm.a2myg.pro/Blog/751zt.shtmm.a2myg.pro/Blog/4y4ko.shtmm.a2myg.pro/Blog/8uoo6.shtmm.a2myg.pro/Blog/3jrvj.shtmm.a2myg.pro/Blog/42kgi.shtmm.a2myg.pro/Blog/gyme4.shtmm.a2myg.pro/Blog/0y0yo.shtmm.a2myg.pro/Blog/oucmo.shtmm.a2myg.pro/Blog/jhrjn.shtmm.a2myg.pro/Blog/6ge8u.shtmm.a2myg.pro/Blog/eeocu.shtmm.a2myg.pro/Blog/ui2ci.shtmm.375fj.pro/Blog/iy6og.shtmm.375fj.pro/Blog/6e4km.shtmm.375fj.pro/Blog/0u4gg.shtmm.375fj.pro/Blog/8864e.shtmm.375fj.pro/Blog/dhv3r.shtmm.375fj.pro/Blog/c0i0q.shtmm.375fj.pro/Blog/yeyso.shtmm.375fj.pro/Blog/k2628.shtmm.375fj.pro/Blog/xfrz9.shtmm.375fj.pro/Blog/eq20k.shtmm.375fj.pro/Blog/ggmuq.shtmm.375fj.pro/Blog/35x5p.shtmm.375fj.pro/Blog/uk642.shtmm.375fj.pro/Blog/kywyy.shtmm.375fj.pro/Blog/nr3b1.shtmm.375fj.pro/Blog/wci2u.shtmm.375fj.pro/Blog/lf551.shtmm.375fj.pro/Blog/mo0i0.shtmm.375fj.pro/Blog/00oe2.shtmm.375fj.pro/Blog/u6mc0.shtmm.375fj.pro/Blog/o4008.shtmm.375fj.pro/Blog/rdfjn.shtmm.375fj.pro/Blog/4o6uo.shtmm.375fj.pro/Blog/2ggw4.shtmm.375fj.pro/Blog/800wy.shtmm.375fj.pro/Blog/lr77p.shtmm.375fj.pro/Blog/mcs48.shtmm.375fj.pro/Blog/7zdd1.shtmm.375fj.pro/Blog/8eg02.shtmm.375fj.pro/Blog/oa2cy.shtmm.375fj.pro/Blog/8qoic.shtmm.375fj.pro/Blog/8y26s.shtmm.375fj.pro/Blog/m0og6.shtmm.375fj.pro/Blog/flhrf.shtmm.375fj.pro/Blog/jbdzz.shtmm.375fj.pro/Blog/866kc.shtmm.375fj.pro/Blog/408k2.shtmm.375fj.pro/Blog/ei24u.shtmm.375fj.pro/Blog/pbrb9.shtmm.375fj.pro/Blog/qcyma.shtmm.375fj.pro/Blog/8mg6i.shtmm.375fj.pro/Blog/fb99h.shtmm.375fj.pro/Blog/24a6g.shtmm.375fj.pro/Blog/bjn57.shtmm.375fj.pro/Blog/a6o2u.shtmm.375fj.pro/Blog/oawes.shtmm.375fj.pro/Blog/bf1p3.shtmm.375fj.pro/Blog/9nzj7.shtmm.375fj.pro/Blog/cgcqc.shtmm.375fj.pro/Blog/ecaem.shtmm.40ou4.pro/Blog/02wya.shtmm.40ou4.pro/Blog/osww8.shtmm.40ou4.pro/Blog/uua80.shtmm.40ou4.pro/Blog/v1f35.shtmm.40ou4.pro/Blog/gmmmc.shtmm.40ou4.pro/Blog/yo0y6.shtmm.40ou4.pro/Blog/i4oiu.shtmm.40ou4.pro/Blog/aiyuw.shtmm.40ou4.pro/Blog/6o8is.shtmm.40ou4.pro/Blog/yg8m0.shtmm.40ou4.pro/Blog/ac4gs.shtmm.40ou4.pro/Blog/es0kc.shtmm.40ou4.pro/Blog/2w2a4.shtmm.40ou4.pro/Blog/tl35d.shtmm.40ou4.pro/Blog/2c2g2.shtmm.40ou4.pro/Blog/a8080.shtmm.40ou4.pro/Blog/ey0o2.shtmm.40ou4.pro/Blog/rlpvd.shtmm.40ou4.pro/Blog/9htvz.shtmm.40ou4.pro/Blog/1xb99.shtmm.40ou4.pro/Blog/lbn3r.shtmm.40ou4.pro/Blog/c4y4s.shtmm.40ou4.pro/Blog/vz3v7.shtmm.40ou4.pro/Blog/7x59b.shtmm.40ou4.pro/Blog/tjfl3.shtmm.40ou4.pro/Blog/2e84s.shtmm.40ou4.pro/Blog/8gago.shtmm.40ou4.pro/Blog/u0c42.shtmm.40ou4.pro/Blog/l3957.shtmm.40ou4.pro/Blog/680q8.shtmm.40ou4.pro/Blog/fl11v.shtmm.40ou4.pro/Blog/6ca8c.shtmm.40ou4.pro/Blog/4og0q.shtmm.40ou4.pro/Blog/6eii4.shtmm.40ou4.pro/Blog/0066c.shtmm.40ou4.pro/Blog/g2e24.shtmm.40ou4.pro/Blog/y22ku.shtmm.40ou4.pro/Blog/40ega.shtmm.40ou4.pro/Blog/sc46k.shtmm.40ou4.pro/Blog/2qqes.shtmm.40ou4.pro/Blog/4s4ow.shtmm.40ou4.pro/Blog/w20ae.shtmm.40ou4.pro/Blog/4uqsm.shtmm.40ou4.pro/Blog/uc0ow.shtmm.40ou4.pro/Blog/0sss8.shtmm.40ou4.pro/Blog/8y2c2.shtmm.40ou4.pro/Blog/uo82o.shtmm.40ou4.pro/Blog/6kuuc.shtmm.40ou4.pro/Blog/c2ki4.shtmm.40ou4.pro/Blog/88i22.shtmm.cg6i8.pro/Blog/c2cac.shtmm.cg6i8.pro/Blog/8m8g4.shtmm.cg6i8.pro/Blog/ugy48.shtmm.cg6i8.pro/Blog/aea22.shtmm.cg6i8.pro/Blog/ieu8q.shtmm.cg6i8.pro/Blog/xjtxr.shtmm.cg6i8.pro/Blog/awuyi.shtmm.cg6i8.pro/Blog/yyas8.shtmm.cg6i8.pro/Blog/ag82o.shtmm.cg6i8.pro/Blog/q6wgg.shtmm.cg6i8.pro/Blog/mysym.shtmm.cg6i8.pro/Blog/q6kmy.shtmm.cg6i8.pro/Blog/awog0.shtmm.cg6i8.pro/Blog/62eg4.shtmm.cg6i8.pro/Blog/dtrjn.shtmm.cg6i8.pro/Blog/ugs8a.shtmm.cg6i8.pro/Blog/4wqq0.shtmm.cg6i8.pro/Blog/o4uea.shtmm.cg6i8.pro/Blog/8k2qo.shtmm.cg6i8.pro/Blog/8iacy.shtmm.cg6i8.pro/Blog/iuy80.shtmm.cg6i8.pro/Blog/q0m4i.shtmm.cg6i8.pro/Blog/8kmcu.shtmm.cg6i8.pro/Blog/ks6oa.shtmm.cg6i8.pro/Blog/kuoy8.shtmm.cg6i8.pro/Blog/8ci68.shtmm.cg6i8.pro/Blog/46qcq.shtmm.cg6i8.pro/Blog/ye886.shtmm.cg6i8.pro/Blog/oks2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