order.cpp

来自「Think in C++文中代码实现」· C++ 代码 · 共 75 行

// File from page 507 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).
//////////////////////////////////////////////////

//: ORDER.CPP -- Constructor/destructor order
#include <fstream.h>
ofstream out("order.out");

#define CLASS(ID) class ID { \
public: \
  ID(int) { out << #ID " constructor\n"; } \
  ~ID() { out << #ID " destructor\n"; } \
};

CLASS(base1);
CLASS(member1);
CLASS(member2);
CLASS(member3);
CLASS(member4);

class derived1 : public base1 {
  member1 m1;
  member2 m2;
public:
  derived1(int) : m2(1), m1(2), base1(3) {
    out << "derived1 constructor\n";
  }
  ~derived1() {
    out << "derived1 destructor\n";
  }
};

class derived2 : public derived1 {
  member3 m3;
  member4 m4;
public:
  derived2() : m3(1), derived1(2), m4(3) {
    out << "derived2 constructor\n";
  }
  ~derived2() {
    out << "derived2 destructor\n";
  }
};

main() { derived2 d2; }