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The declaration Vector u; would construct the vector u having 1 element with the value 0.0; the declaration Vector v(4); would construct the vector v with 4 elements all with the value 0.0; and the declaration Vector w(8, 3.14159); would construct the vector w with 8 elements all with the value 3.14159. This constructor uses the initialization list size(sz) to assign the argument sz to the data member size. Then it uses the new operator to allocate that number of elements to the array data. Finally, it initializes each element with the value t. The copy constructor is almost the same as the default constructor: Vector::Vector(const Vector& v) : size(v.size) { data = new double[v.size]; for (int i = 0; i < size; i++) data[i] = v.data[i]; } It uses the data members of the vector argument v to initialize the object being constructed. So it assigns v.size to the new object s size member, and it assigns v.data[i] to the elements of the new object s data member. The destructor simply restores the storage allocated to the data array and then sets data to NULL and size to 0: Vector::~Vector() { delete [] data; data = NULL; size = 0; } The overloaded assignment operator creates a new object that duplicates the vector v: const Vector& Vector::operator=(const Vector& v) { if (&v != this) { delete [] data; size = v.size; data = new double[v.size]; for (int i = 0; i < size; i++) data[i] = v.data[i]; } return *this; } The condition (&v != this) determines whether the object that owns the call is different from the vector v. If the address of v is the same as this (which is the address of the current object), then they are the same object and nothing needs to be done. This check is a safety precaution to guard against the possibility that an object might, directly or indirectly, be assigned to itself, like this: w = v = w;. Before creating a new object, the function restores the allocated data array. Then it copies the vector v the same way that the copy constructor did. The overloaded subscript operator simply returns the ith component of the object s data array: double& Vector::operator[](int i) const { return data[i]; } Ratio operator+(const Ratio& r1, const Ratio& r2) { Ratio r(r1.num*r2.den+r2.num*r1.den,r1.den*r2.den); r.reduce(); return r; } Ratio operator/(const Ratio& r1, const Ratio& r2) { Ratio r(r1.num*r2.den,r1.den*r2.num);
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r.reduce(); return r; 11.4 } ostream& operator<<(ostream& ostr, const Ratio& r) { return ostr << r.num << "/" << r.den; } Point& Point::operator=(const Point& point) { _x = point._x; _y = point._y; _z = point._z; return *this; } ostream& operator<<(ostream& ostr, const Point& point) { return ostr << "(" << _x << "," << _y << "," << _z << ")"; } bool Point::operator==(const Point& point) const { return _x == point._x && _y == point._y && _z == point._z; } bool Point::operator!=(const Point& point) const { return _x != point._x || _y != point._y || _z != point._z; } Point operator+(const Point& p1, const Point& p2) { return Point(p1._x+p2._x,p1._y+p2._y,p1._z+p2._z); } Point operator-(const Point& p1, const Point& p2) { return Point(p1._x-p2._x,p1._y-p2._y,p1._z-p2._z); } Point operator*(const double coef, const Point& point) { return Point(coef*point._x,coef*point._y,coef*point._z); }
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Composition and Inheritance
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12.1 INTRODUCTION We often need to use existing classes to define new classes. The two ways to do this are called composition and the inheritance. This chapter describes both methods and shows how to decide when to use them. 12.2 COMPOSITION Composition (also called containment or aggregation) of classes refers to the use of one or more classes within the definition of another class. When a data member of the new class is an object of another class, we say that the new class is a composite of the other objects. EXAMPLE 12.1 A Person Class
Here is a simple definition for a class to represent people. class Person { public: Person(char* n="", char* nat="U.S.A.", int s=1) : name(n), nationality(nat), sex(s) { } void printName() { cout << name; } void printNationality() { cout << nationality; } private: string name, nationality; int sex; };
int main() { Person creator("Bjarne Stroustrup", "Denmark"); cout << "The creator of C++ was "; creator.printName(); cout << ", who was born in "; creator.printNationality(); cout << ".\n"; } The creator of C++ was Bjarne Stroustrup, who was born in Denmark.
This example illustrates the composition of the string class within the Person class. The next example defines another class that we can compose with the Person class to improve it: 273
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