employ1.cpp

经典vc教程的例子程序

// Fig. 7.9: employ1.cpp
// Member function definitions for class Employee
#include <iostream.h>
#include <string.h>
#include <assert.h>
#include "employ1.h"

// Initialize the static data member
int Employee::count = 0;

// Define the static member function that
// returns the number of employee objects instantiated.
int Employee::getCount() { return count; }

// Constructor dynamically allocates space for the
// first and last name and uses strcpy to copy
// the first and last names into the object
Employee::Employee( const char *first, const char *last )
{
   firstName = new char[ strlen( first ) + 1 ];
   assert( firstName != 0 );   // ensure memory allocated
   strcpy( firstName, first );

   lastName = new char[ strlen( last ) + 1 ];
   assert( lastName != 0 );    // ensure memory allocated
   strcpy( lastName, last );

   ++count;  // increment static count of employees
   cout << "Employee constructor for " << firstName
        << ' ' << lastName << " called." << endl;
}

// 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
}

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

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