// fig12_04.cpp
// Demonstrating stack unwinding.
#include <iostream>
#include <stdexcept>     

// function3 throws runtime error
void function3() {
   std::cout << "In function 3\n";

   // no try block, stack unwinding occurs, return control to function2
   throw std::runtime_error{"runtime_error in function3"};
}

// function2 invokes function3
void function2() {
   std::cout << "function3 is called inside function2\n";
   function3(); // stack unwinding occurs, return control to function1
}

// function1 invokes function2
void function1() {
   std::cout << "function2 is called inside function1\n";
   function2(); // stack unwinding occurs, return control to main
}

// demonstrate stack unwinding
int main() {
   // invoke function1
   try {
      std::cout << "function1 is called inside main\n";
      function1(); // call function1 which leads to a runtime_error
   }
   catch (const std::runtime_error& error) { // handle runtime error
      std::cout << "Exception occurred: " << error.what()
         << "\nException handled in main\n";
   }
}


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