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这是我在OOP课程的示例中找到的一段代码。当我尝试编译我收到以下错误:无法访问在'A'类中声明的受保护成员
'A::x' : cannot access protected member declared in class 'A'.
因为继承的,应该不是B能够访问A的保护的诠释?
#include<iostream>
using namespace std;
class A
{
protected: int x;
public: A(int i = -16) { x = i; }
virtual A f(A a) { return x + a.x; }
void afisare() { cout << x; }
};
class B : public A
{
public: B(int i = 3) :A(i) {}
A f(A a) { return x + a.x + 1; }
};
int main()
{
A *p1 = new B, *p2 = new A, *p3 = new A(p1->f(*p2));
p3->afisare();
system("Pause");
}