ninherit.cpp

来自「C++编程思想第二版第一册答案」· C++ 代码 · 共 39 行

//: C14:Ninherit.cpp
// From Thinking in C++, 2nd Edition
// Available at http://www.BruceEckel.com
// (c) Bruce Eckel 1999
// Copyright notice in Copyright.txt
// Non-inherited functions
#include <fstream>
using namespace std;
ofstream out("ninherit.out");

class Root {
public:
  Root() { out << "Root()\n"; }
  Root(Root&) { out << "Root(Root&)\n"; }
  Root(int) { out << "Root(int)\n"; }
  Root& operator=(const Root&) {
    out << "Root::operator=()\n";
    return *this;
  }
  class Other {};
  operator Other() const {
    out << "Root::operator Other()\n";
    return Other();
  }
  ~Root() { out << "~Root()\n"; }
};

class Derived : public Root {};

void f(Root::Other) {}

int main() {
  Derived d1;  // Default constructor
  Derived d2 = d1; // Copy-constructor
//! Derived d3(1); // Error: no int constructor
  d1 = d2; // Operator= not inherited
  f(d1); // Type-conversion IS inherited
} ///:~