-
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(kind-of relationship) . , . , . . . (derived class) , (base class). , .
, , EmployeeApp. , : , . Employee , . , CalculatePay , . , CalculatePay , .
""
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-, : , . , , , , .
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: . : PolyApp.Calculate Pay Employee. Employee, , , Employee, !
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.
using System;
class Employee
{
public Employee(string firstName, string lastName, int age, double payRate)
{
this.firstName = firstName;
this.lastName = lastName;
this.age = age;
this.payRate = payRate; }
protected string firstName;
protected string lastName;
protected int age;
protected double payRate;
public virtual double CalculatePay(int hoursWorked)
{
Console.WriteLine("Employee.CalculatePay"); return 42;
}
class SalariedEmployee: Employee {
public SalariedEmployee(string firstName, string lastName,
int age, double payRate): base(firstName, lastName, age, payRate) {}
public override double CalculatePay(int hoursWorked) {
Console.WriteLine("SalariedEmployee.CalculatePay"); return 42; // } }.
class ContractorEmployee: Employee {
public ContractorEmployee(string firstName, string lastName, int age, double payRate)
: base(firstName, lastName, age, payRate)}
public override double CalculatePay(int hoursWorked) {
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Console.WriteLineC'ContractorEmployee.CalculatePay");
return 42; // } }
class HourlyEmployee: Employee {
public HourlyEmployee(string firstName, string lastName, int age, double payRate)
: base(firstName, lastName, age, payRate){}
public override double CalculatePay(int hoursWorked)
Console.WriteLine("Hou rlyEmployee.CalculatePay");
return 42; // }class PolyApp {
protected Employee[] employees;
protected void LoadEmployeesQ
{
Console.WriteLine(" ...");
// // , , , employees = new Employee[3];
employees[0] = new SalariedEmployee ("Amy", "Ariderson", 28, 100);
employees[1] = new ContractorEmployee ("John", "Maffei", 35, 110); employees[2] = new HourlyEmployee ("Lani", "Ota", 2000, 5);
Console. Writel_ine("\n"); }
protected void CalculatePayO.
{foreach(Employee emp in employees)
emp.CalculatePay(40);
} }
public static void Main()
{PolyApp app = new PolyAppQ;
app.LoadEmployees(); app. CalculatePayO; } }
() ++#. STL.
, ? , , Vector. , , , "" :
template < class T > class Vector // T
{ T * v;
int sz;
public:
Vector (int s)
{ if (s <= 0)
error (" Vector ");
v = new T [ sz = s ]; // s T
}
T & operator [] (int i);
int size () { return sz; }};
. . template<class T>, , , -.
void f ()
{ Vector < int > v1 (100); // 100
Vector < complex > v2 (200); // 200
v2 [ i ] = complex (v1 [ x ], v1 [ y ]);}
template, . :
template< typename T >
void sort(T array[], int size); // sort ,
template< typename T >
void sort(T array[], int size) { /* */} //
template< int BufferSize > //
char* read()
{ char *Buffer = new char[ BufferSize ]; /* */
return Buffer;}
typename , class typename:
template< class T >
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template< class T >
class List
{public:
void Add(const T& Element);
bool Find(const T& Element);};
, :
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List<int> li;
List<string> ls;
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equal. , , :
template <class InputIterator1, class InputIterator2>
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