如何覆盖私有函数内调用的公有虚函数？
0
[已关闭问题]
关闭于 2012-10-31 11:01
基类定义了私有的void run()和公有的virtual bool filter()
run()调用了filter()
在派生类中定义bool filter()
该如何通过基类的run()启动派生类的filter()？
问题补充：
virbase.h
virbase.cpp
virderived.h
virderived.cpp
test-vir.cpp
virbase.h
1 #ifndef VIRBASE_H 2 #define VIRBASE_H 3 4 #include "boost/thread/thread.hpp" 5 6 namespace virbase 7 { 8 9 class Vir 10 { 11 public: 12 Vir(); 13 virtual ~Vir() {} 14 15 virtual void show(); 16 17 private: 18 void run_vir(); 19 boost::thread _thread; 20 21 }; // class virbase::Vir 22 23 } // namespace virbase 24 25 #endif // VIRBASE_H
virbase.cpp
1 #include "virbase.h" 2 3 #include <iostream> 4 5 #include "boost/thread/thread.hpp" 6 #include "boost/bind.hpp" 7 8 namespace virbase 9 { 10 11 Vir::Vir() : _thread(boost::bind(&Vir::run_vir, this)) 12 { 13 } 14 15 void 16 Vir::show() 17 { 18 std::cout << "virbase::Vir::show ..." << std::endl; 19 } 20 21 void 22 Vir::run_vir() 23 { 24 show(); 25 } 26 27 } // namespace virbase
virderived.h
1 #ifndef VIRDERIVED_H 2 #define VIRDERIVED_H 3 4 #include "virbase.h" 5 6 namespace virderived 7 { 8 9 class Vir : public virbase::Vir 10 { 11 public: 12 explicit Vir(); 13 14 void show(); 15 16 }; // class virderived::Vir 17 18 } // namespace virderived 19 20 #endif // VIRDERIVED_H
virderived.cpp
1 #include "virderived.h" 2 3 #include <iostream> 4 5 namespace virderived 6 { 7 8 Vir::Vir() : virbase::Vir() 9 { 10 } 11 12 void 13 Vir::show() 14 { 15 std::cout << "virderived::vir::show ..." << std::endl; 16 } 17 18 } // namespace virderived
test-vir.cpp
1 #include "virderived.h" 2 3 int main() 4 { 5 using namespace virderived; 6 7 Vir v; 8 //v.run_vir(); // error 9 10 return 0; 11 }
如何让virderived::Vir类通过virbase::Vir::run_vir()调用virderived::Vir::show()，而不是基类virbase::Vir::show()？
所有回答(2)
1
你在基类的run方法里调用filter，如果实例是子类实例，那么调用的就是子类的filter。
0
class BaseClass{
private void run(){
filter();
}
public virtual void filte(){}
}
class Extended:BaseClass{
public override void filte(){
base.filte();
}
}