nomemory.cpp

Think in C++ 第二版源码

//: C13:NoMemory.cpp
// From Thinking in C++, 2nd Edition
// Available at http://www.BruceEckel.com
// (c) Bruce Eckel 1999
// Copyright notice in Copyright.txt
// Constructor isn't called
// If new returns 0
#include <iostream>
#include <new> // size_t definition
using namespace std;

void my_new_handler() {
  cout << "new handler called" << endl;
}

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() {
  set_new_handler(my_new_handler);
  NoMemory* nm = new NoMemory;
  cout << "nm = " << nm << endl;
} ///:~