?? addv.cpp
字號:
//: C15:Addv.cpp
// From Thinking in C++, 2nd Edition
// Available at http://www.BruceEckel.com
// (c) Bruce Eckel 1999
// Copyright notice in Copyright.txt
// Adding virtuals in derivation
#include <iostream>
using namespace std;
class Base {
int i;
public:
Base(int ii) : i(ii) {}
virtual int value() const { return i; }
};
class Derived : public Base {
public:
Derived(int ii) : Base(ii) {}
int value() const {
return Base::value() * 2;
}
// New virtual function in the Derived class:
virtual int shift(int x) const {
return Base::value() << x;
}
};
int main() {
Base* B[] = { new Base(7), new Derived(7) };
cout << "B[0]->value() = "
<< B[0]->value() << endl;
cout << "B[1]->value() = "
<< B[1]->value() << endl;
//! cout << "B[1]->shift(3) = "
//! << B[1]->shift(3) << endl; // Illegal
} ///:~
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