#include <iostream.h>
#include <new.h>
#include <string.h>
class Employee {
public:
Employee( const char *, const char * );
~Employee();
const char *getFirstName() const;
const char *getLastName() const;
// static member function
static int getCount();
private:
char *firstName;
char *lastName;
// static data member
static int count;
};
int Employee::count = 0;
int Employee::getCount()
{
return count;
}
// 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;
}
// 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
}
const char *Employee::getFirstName() const
{
return firstName;
}
const char *Employee::getLastName() const
{
return lastName;
}
int main()
{
cout <<"Number of employees before instantiation is "
<<Employee::getCount() << endl;
Employee *e1Ptr = new Employee( "Susan", "Baker" );
Employee *e2Ptr = new Employee( "Robert", "Jones" );
cout << "Number of employees after instantiation is "
<< e1Ptr->getCount();
cout << "\n\nEmployee 1: "
<< e1Ptr->getFirstName()
<< " " << e1Ptr->getLastName()
<< "\nEmployee 2: "
<< e2Ptr->getFirstName()
<< " " << e2Ptr->getLastName() << "\n\n";
delete e1Ptr; //recapture memory
e1Ptr = 0; //disconnect pointer from free-store space
delete e2Ptr; //recapture memory
e2Ptr = 0; //disconnect pointer from free-store space
cout << "Number of employees after deletion is "
<< Employee::getCount() << endl;
return 0;
}
Number of employees before instantiation is 0
Employee constructor for Susan Baker called.
Employee constructor for Robert Jones called.
Number of employees after instantiation is 2
Employee 1: Susan Baker
Employee 2: Robert Jones
~Employee() called for Susan Baker
~Employee() called for Robert Jones
Number of employees after deletion is 0
