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exit in cpp


 
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# 1  
Old 08-18-2009
exit in cpp

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  
Old 08-18-2009
Sounds like you are looking for the atexit() function.
# 3  
Old 08-18-2009
yes....but atexit() does not take any arguments. How can this be implemented in object oriented paradigm ???
# 4  
Old 08-18-2009
Quote:
Originally Posted by lipun4u
yes....but atexit() does not take any arguments.
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  
Old 08-18-2009
Throw an exception.

What you want to do is throw an exception.

Code:
// 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;
};

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;
}

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


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