简单来说就是virtual function加了private的话，virtual就变得没作用了。
private virtual在如下几种场景中：非嵌套类内的方法：这种情况下private virtual没有意义，因为子类既不...
}; 在main函数里产生一个Derived的对象d,然后调用print()函数,即d.print(),结果输出的却是Base,print()函数没有调用子类的PrintClassName函数,而是调用父类的PrintClassName函数,原来是由于PrintClassName函数不是虚函数之故,所以Base的print()函数调用PrintClassName()函数是在编译时就已经绑定了,而不是运行期绑定。
如果Widget继承自Timer,上面的想法就不可能实现,即使是private继承也不可能。(条款35说derived class可以重新定义virtual函数,即使它们不得调用它)但如果WidgetTimer是Widget内部的一个private成员并继承Timer,Widget的derived classes将无法取用WidgetTimer,因此无法继承它或重新定义它的virtual函数。有些类似java的final或c#...
Example: crn:v1:bluemix:public:is:us-south-1:a/aa2432b1fa4d4ace891e9b80fc104e34::volume:r006-1a6b7274-678d-4dfb-8981-c71dd9d4daa5 id Always included*string The unique identifier for this volume Possible values: 1≤ length ≤ 64, Value must match regular expression ^[-0-9a-z_...
1classWidget:privateTimer {2private:34virtualvoidonTick()const;//look at Widget usage data, etc.56...78} 凭借private继承的力量,Timer的public onTick函数在Widget中变为了private,我们将其放在private关键字下并对其进行了重新声明。 2.3 使用组合(compostion)以及两个优点 ...
Function Queries all networks accessible to the tenant submitting the request. A maximum of 2,000 records can be returned for each query operation. If the number of records exceeds 2,000, the pagination marker will be returned. URI GET /v2.0/networks ...
su net_srv -s /bin/bash -c "/home/vpc/netservice/bin/tomcat/restart.sh" Step 9 Check whether the alarm is cleared after the restart. ● If yes, go to Step 10. ● If no, contact technical support to reinstall the service. After the reinstallation, no further action is required. ...
POST https://{Endpoint}/v5/{project_id}/vpn-connection { "vpn_connection": { "name": "vpn-1655", "vgw_id": "b32d91a4-demo-a8df-va86-e907174eb11d", "vgw_ip": "0c464dad-demo-a8df-va86-c22bb0eb0bde", "style": "bgp", "cgw_id": "5247ae10-demo-a8df-va86-dd36659a7...
2. Call pure virtual function class A { protected: virtual void Fun() =0; }; class B:public A { public: B() {Dummy();} private: void Dummy() {Fun();} }; class C:public B { public: virtual void Fun() {} }; int main() { C c; } Do you ever wonder how to call pure...