Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people, just like you, are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
Solved

newbie question on exceptions, easy money

Posted on 2002-05-23
4
201 Views
Last Modified: 2010-04-02
I'm new to exceptions, here's the background:
1 singleton
1 customer header and source file
1 employee header and source file
1 baseops header and source (creates id's)
1 class customer list that contians a map to link name and id.
1 for employee as well

would like to have customer id begin with 1 and employee begin with 2.  
on the menu you can add/delete/modify a customer or employee.. I want it to be if the user selects add employee and starts to enter an e.id=1 an error will be thrown (invalid id for employee, or something).

Question:  how should my header file and source file look for employee Error?  Do I need to add anything to my baseops?

portion of code:  be kind, I'm new!

//customer.h
#ifndef CUSTOMER_H
#define CUSTOMER_H

#include "BaseOPS.h"
#include "BaseOPSFactory.h"
class BaseOPSFactory;

class Customer : public BaseOPS{
friend class BaseOPSFactory;
public:
     void getData(); //throw (CustomerListError);
     void setData(string); //throw (CustomerListError);
     void modifyData(); //throw (CustomerListError);
     ~Customer();
     void showData();//throw ();

protected:
     Customer();    
private:
     string Name;
     
};
#endif


//Customer.cpp

#include "Customer.h"
//#include "Credit.h"

// #include "CustomerListError.h"
#include <iostream>

Customer::Customer():BaseOPS()
{
}

void Customer::getData() //throw (CustomerListError)
{
     cout << "Enter customer name:      " <<endl;
     cin >> Name;      
     cout << endl;

     /*
     if(Name >       // if name is not a char then throw error  (if name!= char)
     {
          throw Error;
     }*/
}



void Customer::modifyData() //throw (CustomerListError)
{
     cout << "Customer name:         " << Name;      
     cout << endl;
     cout << "Enter customer name:     " <<endl;
     cin >> Name;      
     cout << endl;

}

Customer::~Customer()
{
     
}

void Customer::setData(string D)
{
     BaseOPS::setData(D);
}
void Customer::showData()
{
     BaseOPS::showData();
     cout << "Customer name is:          " << Name ;

}

0
Comment
Question by:student1
  • 2
  • 2
4 Comments
 
LVL 4

Accepted Solution

by:
ct.smith earned 50 total points
ID: 7029951
C++ allows you to use anything for an exception (even primitive types like int and float), so the thing to do is to decide what information is relevant to the error condition and wrap it up nicely in some sort of class/struct/enum ...

A few nice (completely non-obligatory) conventions:
- use a class
- append 'Exc' to your class name
- inerit from the STL exception class.
- don't use the word 'error' when referring to exceptions, there's a difference that some people get rather caught up about.

example header file:

#ifndef __IDEXC_H__
#define __IDEXC_H__

#inlcude <exception>

class IdExc : public std::exception {
public:
  const char* what() {return "Invalid Employee ID";}
};

#endif

Of course, you will want to expand this template to whatever information is useful to your application.  But,
at least this code segment should get you started.
0
 

Author Comment

by:student1
ID: 7030669
thanks for pointing me in the right direction... I should be able to create a template class and adapt it to all necessary classes, ie. employee, customer, vendor, product.. correct?
0
 
LVL 4

Expert Comment

by:ct.smith
ID: 7030723
Yes, in fact if you have several related types, inheriting something like my example would make a nice way to organise the various exceptions.

Good luck!
0
 

Author Comment

by:student1
ID: 7032367
CT.. Because all my classes, ie. employee/customer/vendor/product, are basically the same, ie. get name/set name/modify name/etc... can I just create 1 template class like my exception template class?

anthony
0

Featured Post

Networking for the Cloud Era

Join Microsoft and Riverbed for a discussion and demonstration of enhancements to SteelConnect:
-One-click orchestration and cloud connectivity in Azure environments
-Tight integration of SD-WAN and WAN optimization capabilities
-Scalability and resiliency equal to a data center

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Templates For Beginners Or How To Encourage The Compiler To Work For You Introduction This tutorial is targeted at the reader who is, perhaps, familiar with the basics of C++ but would prefer a little slower introduction to the more ad…
Container Orchestration platforms empower organizations to scale their apps at an exceptional rate. This is the reason numerous innovation-driven companies are moving apps to an appropriated datacenter wide platform that empowers them to scale at a …
The goal of the tutorial is to teach the user how to use functions in C++. The video will cover how to define functions, how to call functions and how to create functions prototypes. Microsoft Visual C++ 2010 Express will be used as a text editor an…
The viewer will learn how to user default arguments when defining functions. This method of defining functions will be contrasted with the non-default-argument of defining functions.

828 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question