非虚拟接口 - 如何调用正确的虚拟函数
我有一个看起来像这样的层次结构：
class Base
{
public:
void Execute();
virtual void DoSomething() = 0;
private:
virtual void exec_();
};
class Derived : public Base
{
public:
//DoSomething is implementation specific for classes Derived from Base
void DoSomething();
private:
void exec_();
};
void Base::Execute()
{
// do some work
exec_(); //work specific for derived impl
// do some other work
}
void Derived::DoSomething()
{
//impl dependent so it can only be virtual in Base
}
int main()
{
Derived d;
Base& b = d;
b.Execute(); //linker error cause Derived has no Execute() function??
}
所以问题是，当我使用基类创建派生类时，如何使用此模式调用 Execute()。就我而言，我不想直接创建 Derived，因为我有多个从 Base 派生的类，并且根据某些条件我必须选择不同的派生类。
有人可以帮忙吗？
I have a hierarchy that looks something like this:
class Base
{
public:
void Execute();
virtual void DoSomething() = 0;
private:
virtual void exec_();
};
class Derived : public Base
{
public:
//DoSomething is implementation specific for classes Derived from Base
void DoSomething();
private:
void exec_();
};
void Base::Execute()
{
// do some work
exec_(); //work specific for derived impl
// do some other work
}
void Derived::DoSomething()
{
//impl dependent so it can only be virtual in Base
}
int main()
{
Derived d;
Base& b = d;
b.Execute(); //linker error cause Derived has no Execute() function??
}
So the question is how do I call Execute() using this pattern when I create a derived using my Base class. In my case I do not want to create Derived directly, as I have multiple classes derived from Base and depending on some condition I have to pick a different derived class.
can anyone help?
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评论（3）
它可以
为我编译、链接和运行。
This
compiles, links, and runs for me.
您可能还应该在基类中将 exec_() 设为纯虚拟。然后，您还需要在派生类中实现它。
You should probably also make exec_() pure virtual in your base class. You then also need to implement it in your derived classes.
您需要为 exec_() 函数编写函数定义。
You need to write a function definition for exec_() function.