exit in cpp

Applications Programming
1

In a program if we call exit(0), it exits the program and before that it closes all opened stream.

In C++, it even does destroys the created objects. Is there any function available, which if called will do some basic clean ups (which includes object destruction) ???

2

Sounds like you are looking for the atexit() function.

3

yes....but atexit() does not take any arguments. How can this be implemented in object oriented paradigm ???

4

atexit() does take arguments as it calls a function when exiting the program, however the called function cannot return arguments. Have a look at this page.

If you want your program to return a value, you could try the _exit() function. More info here.

5

What you want to do is throw an exception.

// Special exception to throw
class exit_exception : public runtime_error
{
  public:
     exit_exception() : runtime_error("Termination"), _code(0) {}
     exit_exception(int code) : runtime_error("Termination"), _code(code){}
     virtual ~exit_exception(){}
     int getStatusCode()const{ return _code; }
  private:
      int _code;
};

// Main function
int main(int argc, char* argv[])
{
    int retcode = 0;
    try {
          // program content...
    }catch(const exit_exception& quit){
         retcode = quit.getStatusCode();
    }
    return retcode;
}

// ...
throw(exit_exception(0)); // Instead of exit(0)
// ...