employee.cpp

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// Fig. 10.22: Employee.cpp
// Member-function definitions for class Employee.
#include <iostream>
using std::cout;
using std::endl;

#include <cstring> // strlen and strcpy prototypes
using std::strlen;
using std::strcpy;

#include "Employee.h" // Employee class definition 

// define and initialize static data member at file scope
int Employee::count = 0;

// define static member function that returns number of 
// Employee objects instantiated (declared static in Employee.h)
int Employee::getCount() 
{ 
   return count; 
} // end static function getCount

// constructor dynamically allocates space for first and last name and 
// uses strcpy to copy first and last names into the object
Employee::Employee( const char * const first, const char * const last )
{
   firstName = new char[ strlen( first ) + 1 ];
   strcpy( firstName, first );

   lastName = new char[ strlen( last ) + 1 ];
   strcpy( lastName, last );

   count++; // increment static count of employees

   cout << "Employee constructor for " << firstName
      << ' ' << lastName << " called." << endl;
} // end Employee constructor

// destructor deallocates dynamically allocated memory
Employee::~Employee()
{
   cout << "~Employee() called for " << firstName
      << ' ' << lastName << endl;

   delete [] firstName; // release memory
   delete [] lastName; // release memory

   count--; // decrement static count of employees
} // end ~Employee destructor

// return first name of employee
const char *Employee::getFirstName() const
{
   // const before return type prevents client from modifying
   // private data; client should copy returned string before
   // destructor deletes storage to prevent undefined pointer
   return firstName;
} // end function getFirstName

// return last name of employee
const char *Employee::getLastName() const
{
   // const before return type prevents client from modifying
   // private data; client should copy returned string before
   // destructor deletes storage to prevent undefined pointer
   return lastName;
} // end function getLastName

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