nudep.cpp

Think in C++ 第二版源码

//: C23:Nudep.cpp
// From Thinking in C++, 2nd Edition
// Available at http://www.BruceEckel.com
// (c) Bruce Eckel 1999
// Copyright notice in Copyright.txt
// Naked pointers
#include <fstream>
#include <cstdlib>
using namespace std;
ofstream out("nudep.out");

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

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

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

int main() {
  try {
    UseResources ur(3);
  } catch(int) {
    out << "inside handler" << endl;
  }
} ///:~