nomemory.cpp

ThinkingC++中文版

//: C13:NoMemory.cpp
// From Thinking in C++, 2nd Edition
// Available at http://www.BruceEckel.com
// (c) Bruce Eckel 2000
// Copyright notice in Copyright.txt
// Constructor isn't called if new fails
#include <iostream>
#include <new> // bad_alloc definition
using namespace std;

class NoMemory {
public:
  NoMemory() {
    cout << "NoMemory::NoMemory()" << endl;
  }
  void* operator new(size_t sz) throw(bad_alloc){
    cout << "NoMemory::operator new" << endl;
    throw bad_alloc(); // "Out of memory"
  }
};

int main() {
  NoMemory* nm = 0;
  try {
    nm = new NoMemory;
  } catch(bad_alloc) {
    cerr << "Out of memory exception" << endl;
  }
  cout << "nm = " << nm << endl;
} ///:~