// exceptions

#include <iostream>

using namespace std;



int main () {

  try

  {

    throw 20;

  }

  catch (int e)

  {

    cout << "An exception occurred. Exception Nr. " << e << endl;

  }

  return 0;

}

try {

  // code here

}

catch (int param) { cout << "int exception"; }

catch (char param) { cout << "char exception"; }

catch (...) { cout << "default exception"; }

try {

  try {

      // code here

  }

  catch (int n) {

      throw;

  }

}

catch (...) {

  cout << "Exception occurred";

}

// standard exceptions

#include <iostream>

#include <exception>

using namespace std;



class myexception: public exception

{

  virtual const char* what() const throw()

  {

    return "My exception happened";

  }

} myex;



int main () {

  try

  {

    throw myex;

  }

  catch (exception& e)

  {

    cout << e.what() << endl;

  }

  return 0;

}

#if defined(__cplusplus)

/* C++ exceptions */

#define LUAI_THROW(L,c) throw(c)

#define LUAI_TRY(L,c,a) try { a } catch(...) \

{ if ((c)->status == 0) (c)->status = -1; }

#define luai_jmpbuf int /* dummy variable */



#elif defined(LUA_USE_ULONGJMP)

/* in Unix, try _longjmp/_setjmp (more efficient) */

#define LUAI_THROW(L,c) _longjmp((c)->b, 1)

#define LUAI_TRY(L,c,a) if (_setjmp((c)->b) == 0) { a }

#define luai_jmpbuf jmp_buf



#else

/* default handling with long jumps */

#define LUAI_THROW(L,c) longjmp((c)->b, 1)

#define LUAI_TRY(L,c,a) if (setjmp((c)->b) == 0) { a }

#define luai_jmpbuf jmp_buf



#endif