ninherit.cpp

来自「Think in C++文中代码实现」· C++ 代码 · 共 66 行

// File from page 511 in "Thinking in C++" by Bruce Eckel
//////////////////////////////////////////////////
// From the compressed package ECKELT02.ZIP 4/11/95
// (Original ECKELT01.ZIP dated 2/21/95)
// Copyright (c) Bruce Eckel, 1995 
// Source code file from the book "Thinking in C++", 
// Prentice Hall, 1995, ISBN: 0-13-917709-4
// All rights reserved EXCEPT as allowed by the following 
// statements: You may freely use this file for your own 
// work, including modifications and distribution in 
// executable form only. You may copy and distribute this 
// file, as long as it is only distributed in the complete 
// (compressed) package with the other files from this 
// book and you do not remove this copyright and notice. 
// You may not distribute modified versions of the source 
// code in this package. This package may be freely placed 
// on bulletin boards, internet nodes, shareware disks and 
// product vendor disks. You may not use this file in 
// printed media without the express permission of the 
// author. Bruce Eckel makes no 
// representation about the suitability of this software 
// for any purpose. It is provided "as is" without express 
// or implied warranty of any kind. The entire risk as to 
// the quality and performance of the software is with 
// you. Should the software prove defective, you assume 
// the cost of all necessary servicing, repair, or 
// correction. 
// If you think you've found an error, please 
// email all modified files with loudly commented changes 
// to: [e-mail] (please use the same 
// address for non-code errors found in the book).
//////////////////////////////////////////////////

//: NINHERIT.CPP -- Non-inherited functions
#include <fstream.h>
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) {}

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
}