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The overloaded stream insertion operator << inserts the object's buf into the output stream ostr and then returns that reference. The overloaded stream extraction operator >> uses a temporary buffer string to read the input, assigns it to the reference s, and then returns the istream reference istr.
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Note that both of these overloaded stream operators return the stream object that is passed to them. This makes these functions consistent with the corresponding predefined stream operators, allowing them to be invoked in cascades like this.
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Example 10.8 Testing the Stream Operators String sl, s2; cin >>sl >>s2; cout <<sl <<"####" <<s2 <<endl; Hello, World! Hello, ####World!
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The first call is operator>>(cin, s1) which passes a reference to the istream object cin to the parameter istr and a reference to the String object s1 to the parameter s. Then "Hello," is read into the C-string temp. This is assigned to the String object s1, and then a reference to cin is returned. That return value is then used in the second call operator>> (cin, s2) which works the same way, leaving the object s2 representing "World!". The output line intermingles the two calls to the overloaded <<operator with the two calls to the standard <<operator in the cascade: f (f (f (f (cout, s1), "####"), s2 ), endl ); where f is operator <<.
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11 Composition and Inheritance In this chapter: Composition Inheritance protected Class Members Overriding and Dominating Inherited Members private Access versus protected Access virtual Functions and Polymorphism Virtual Destructors We often use existing classes to define new classes. The two ways to do this are called composition and the inheritance. This chapter describes both methods.
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Composition Composition 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 11.1 A Person Class Here is a simple definition for a class to represent people. #include "String. h" class Person { public: Person(char* n="", char* c="", int s=l) : name(n), city(c), sex(s) { } void printName ( ) {cout <<name; } void printCity ( ) {cout <<city;} private: String name, city; int sex; }; void main ( ) { Person satchmo ("Louis Armstrong", "New Orleans"); satchmo.printName ( ); cout <<"/nBorn in "; satchmo.printCity ( ); cout <<".\n"; }
Louis Armstrong Born in New Orleans
We have used the String class (Chap. 10) to declare the data members name and city for the Person class. Notice that we used the String overloaded insertion operator << in the Person class's printName ( ) function. Example 11.1 illustrates the composition of the String class within the Person class. The next example defines another class that we can compose with this class to improve it: Example 11.2 A date Class class Date { friend istream& operator>>(istream&, Date&); friend ostream& operator<<(ostream&, const Date&);
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public: Date(int m=0, int d=0, int y=0): month(m), day(d), year(y) { } void setDate(int m, int d, int y) { month=m; day=d; year=y; } private: int month, day, year; }; istream& operator>>(istream& in, Date& x) { in >>x.month >>x.day >>x.year; return in; } ostream& operator<<(ostream& out, const Date& x) { static char* monthName[13]={ "", "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" }; out <<monthName[x.month] <<' ' <<x.day <<", <<x.year; return out; } void main ( ) { Date peace(11, 11, 1918); cout <<"WW I ended on " <<peace <<".\n"; peace.setDate(8, 14, 1945); cout <<"WW II ended on " <<peace <<".\n"; cout <<"Enter mth, day, & yr: "; Date date; cin >>date; cout <<"The date is " <<date <<"In"; }
WW I ended on Nov 11, 1918 WW II ended on Aug 14, 1945 Enter mth, day, & yr: 7 4 1776 The date is Jul 4, 1776
The test driver tests the default constructor, the setDate() function, the overloaded <<, and the overloaded >>. Now we can use the Date class inside the Person class to store a person's date of birth.
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