Sams Teach Yourself C++ in 21 Days

Templates 675

19

3:

4: const int DefaultSize = 10;

5:

6: class Animal

7: {

8: public:

9: Animal(int);

10: Animal();

11: ~Animal() {}

12: int GetWeight() const { return itsWeight; }

13: void Display() const { cout << itsWeight; }

14: private:

15: int itsWeight;

16: };

17:

18: Animal::Animal(int weight):

19: itsWeight(weight)

20: {}

21:

22: Animal::Animal():

23: itsWeight(0)

24: {}

25:

26: template <class T> // declare the template and the parameter

27: class Array // the class being parameterized

28: {

29: public:

30: // constructors

31: Array(int itsSize = DefaultSize);

32: Array(const Array &rhs);

33: ~Array() { delete [] pType; }

34:

35: // operators

36: Array& operator=(const Array&);

37: T& operator[](int offSet) { return pType[offSet]; }

38: const T& operator[](int offSet) const

39: { return pType[offSet]; }

40: // accessors

41: int GetSize() const { return itsSize; }

42: // template <class T>

43: friend ostream& operator<< (ostream&, Array<T>&);

44:

45: private:

46: T *pType;

47: int itsSize;

48: };

49:

50: template <class T>

51: ostream& operator<< (ostream& output, Array<T>& theArray)

LISTING19.4 continued