nonlocal.cpp

Think in C++ 第二版源码

//: C23:Nonlocal.cpp
// From Thinking in C++, 2nd Edition
// Available at http://www.BruceEckel.com
// (c) Bruce Eckel 1999
// Copyright notice in Copyright.txt
// setjmp() & longjmp()
#include <iostream>
#include <csetjmp>
using namespace std;

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

jmp_buf kansas;

void oz() {
  Rainbow rb;
  for(int i = 0; i < 3; i++)
    cout << "there's no place like home\n";
  longjmp(kansas, 47);
}

int main() {
  if(setjmp(kansas) == 0) {
    cout << "tornado, witch, munchkins...\n";
    oz();
  } else {
    cout << "Auntie Em! "
         << "I had the strangest dream..."
         << endl;
  }
} ///:~