rawp.cpp

c++编程思想2TICPP-2nd-ed-Vol-two.zip

//: C01:Rawp.cpp
// From "Thinking in C++, Volume 2", by Bruce Eckel & Chuck Allison.
// (c) 1995-2004 MindView, Inc. All Rights Reserved.
// See source code use permissions stated in the file 'License.txt',
// distributed with the code package available at www.MindView.net.
// Naked pointers.
#include <iostream>
#include <cstddef>
using namespace std;

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

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

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

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