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newbie question on exceptions, easy money

Posted on 2002-05-23
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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
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