employee2.cpp

《c＋＋大学教程》源码

// Fig. 7.18: employee2.cpp
// Member-function definitions for class Employee.
#include <iostream>

using std::cout;
using std::endl;

#include <new>          // C++ standard new operator
#include <cstring>      // strcpy and strlen prototypes

#include "employee2.h"  // Employee class definition 

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

// define static member function that returns number of 
// Employee objects instantiated
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 *first, const char *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;  // recapture memory
   delete [] lastName;   // recapture 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

/**************************************************************************
 * (C) Copyright 1992-2003 by Deitel & Associates, Inc. and Prentice      *
 * Hall. All Rights Reserved.                                             *
 *                                                                        *
 * DISCLAIMER: The authors and publisher of this book have used their     *
 * best efforts in preparing the book. These efforts include the          *
 * development, research, and testing of the theories and programs        *
 * to determine their effectiveness. The authors and publisher make       *
 * no warranty of any kind, expressed or implied, with regard to these    *
 * programs or to the documentation contained in these books. The authors *
 * and publisher shall not be liable in any event for incidental or       *
 * consequential damages in connection with, or arising out of, the       *
 * furnishing, performance, or use of these programs.                     *
 *************************************************************************/