我低于警告.
我的部分代码是：
我的部分代码是：
class Base {
public:
virtual void process(int x) {;};
virtual void process(int a,float b) {;};
protected:
int pd;
float pb;
};
class derived: public Base{
public:
void process(int a,float b);
}
void derived::process(int a,float b){
pd=a;
pb=b;
....
}
我收到以下警告：
Warning: overloaded virtual function "Base::process" is only partially overridden in class "derived"
我以任何方式将过程作为虚函数,所以我期待这个警告不应该来……
这背后的原因是什么？
解决方法
警告的原因
Warning: overloaded virtual function "Base::process" is only partially overridden in class "derived"
是你没有覆盖所有签名,你已经完成了
virtual void process(int a,float b) {;}
但不是
virtual void process(int x) {;}
另外,当你不重写并且不使用Base :: process将函数带到作用域时,对derived :: process(int)的静态调用甚至都不会编译.这是因为Derived在这种情况下没有进程(int).所以
Derived *pd = new Derived(); pd->process(0);
和
Derived d; d.process(0);
不会编译.
使用声明添加将解决这个问题,通过指向Derived *的指针和选择运算符d.process(int)进行静态调用,以便编译和虚拟调度(通过基指针或引用调用派生)进行编译,无需警告.
class Base {
public:
virtual void process(int x) {qDebug() << "Base::p1 ";};
virtual void process(int a,float b) {qDebug() << "Base::p2 ";}
protected:
int pd;
float pb;
};
class derived: public Base{
public:
using Base::process;
/* now you can override 0 functions,1 of them,or both
* base version will be called for all process(s)
* you haven't overloaded
*/
void process(int x) {qDebug() << "Der::p1 ";}
void process(int a,float b) {qDebug() << "Der::p2 ";}
};
现在：
int main(int argc,char *argv[])
{
derived d;
Base& bref = d;
bref.process(1); // Der::p1
bref.process(1,2); // Der::p2
return 0;
}
