?? paste.cpp
字號:
//: C22:Paste.cpp
// From Thinking in C++, 2nd Edition
// Available at http://www.BruceEckel.com
// (c) Bruce Eckel 1999
// Copyright notice in Copyright.txt
//{L} Vendor
// Fixing a mess with MI
#include "Vendor.h"
#include <fstream>
using namespace std;
ofstream out("paste.out");
class MyBase { // Repair Vendor interface
public:
virtual void v() const = 0;
virtual void f() const = 0;
// New interface function:
virtual void g() const = 0;
virtual ~MyBase() { out << "~MyBase()\n"; }
};
class Paste1 : public MyBase, public Vendor1 {
public:
void v() const {
out << "Paste1::v()\n";
Vendor1::v();
}
void f() const {
out << "Paste1::f()\n";
Vendor1::f();
}
void g() const {
out << "Paste1::g()\n";
}
~Paste1() { out << "~Paste1()\n"; }
};
int main() {
Paste1& p1p = *new Paste1;
MyBase& mp = p1p; // Upcast
out << "calling f()\n";
mp.f(); // Right behavior
out << "calling g()\n";
mp.g(); // New behavior
out << "calling A(p1p)\n";
A(p1p); // Same old behavior
out << "calling B(p1p)\n";
B(p1p); // Same old behavior
out << "delete mp\n";
// Deleting a reference to a heap object:
delete ∓ // Right behavior
} ///:~
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