nudep.cpp

来自「Think in C++文中代码实现」· C++ 代码 · 共 81 行

// File from page 702 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).
//////////////////////////////////////////////////

//: NUDEP.CPP -- Naked pointers
#include <fstream.h>
#include <stdlib.h>
ofstream out("nudep.out");

class bonk {
public:
  bonk() { out << "bonk()" << endl; }
  ~bonk() { out << "~bonk()" << endl; }
};

class og {
public:
  void* operator new(size_t sz) {
    out << "allocating an og" << endl;
    throw int(47);
    return 0;
  }
  void operator delete(void* p) {
    out << "deallocating an og" << endl;
    ::delete p;
  }
};

class useResources {
  bonk* bp;
  og* op;
public:
  useResources(int count = 1) {
    out << "useResources()" << endl;
    bp = new bonk[count];
    op = new og;
  }
  ~useResources() {
    out << "~useResources()" << endl;
    delete []bp; // Array delete
    delete op;
  }
};

main() {
  try {
    useResources ur(3);
  } catch(int) {
    out << "inside handler" << endl;
  }
};