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10.1 INTRODUCTION 7 described the way that character strings are handled using C-style programming: each string is implemented as a pointer p to a char in memory. The actual string of characters that p represents are held in a contiguous block beginning with byte *p and terminated with the NUL character i \ o i . To distinguish this representation from that which will be defined in this chapter, we will refer to the former as C-strings. 7 also described the string . h header file. It defines many functions that operate on C-strings. The String class defined in this chapter will include functions that perform equivalent operations on String objects. Indeed, many of these new operations will be implemented using functions from the string . h header file. The character string abstract data type is an ideal candidate for implementation as a C++ class, encapsulating the data and functionality in individualized objects. This chapter shows one way to do that. Such an implementation allows us to use strings as objects of a String class. 10.2 THE String CLASS INTERFACE There are generally two methods for delimiting an un-indexed sequence of objects. One method is to use a trailer or terminating object to signal the end of the sequence. C-strings are implemented this way, using the NUL character I\ o I as the trailer. It is also the method by which the DOS and UNIX operating systems store records in a file, using the end-of-line character '\n' as the trailer. The other method is to store the length of the sequence with the sequence. This is how the VAX/VMS operating system stores records in a file. It is also how we will implement our String class:
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unsigned len; // the number of (non-NUL) characters stored char* buf; // the actual character string Here, 1en will be the length of the sequence of characters and buf will be the buffer that holds them. Actually, buf is a C-string, so it really is just a pointer to a byte in memory. For example, suppose that name and s tat e are string objects representing the C-strings 'IT. Jefferson" and Virginia". Then we can visualize them like this:
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This implementation will improve the efficiency of some string operations. For example, to and "ABCDEFGHIJKLMNOPQRSTUVWXYZ" determine that "ABCDEFGHIJKLMNOPQRSTUVWXY" are not equal requires examining all 51 characters. But since we are storing the strings lengths in our String class, the comparison operator need only compare the integers 25 and 26 to determine that these two strings are not equal. Here is the class interface for a String class:
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#include <iostream.h>
class String { friend int operator==(const String&, const String&); friend int operator!=(const String&, const String&); friend int operator<(const String&, const String&); friend int operator<=(const String&, const String&); friend int operator>(const String&, const String&); friend int operator>=(const String&, const String&); friend ostream& operator<<(ostream&, const String&); friend istream& operator>>(istream&, String&); friend String operator+(const String&, const String&); publx: String(unsigned =O); // default constructor String(char, unsigned); // constructor String(const char*); // constructor String(const String&); // copy constructor -String(); // destructor // assignment operator String& operator=(const String&); // append operator String& operator+=(const String&); // conversion operator operator char*0 const; // subscript operator char& operator[] (unsigned) const; // access function unsigned length0 const; private: unsigned len; // the number of (non-NUL) characters stored char* buf; // the actual character string 1;
Note that this interface is very similar to that of the Vet t or class (Problem 9.14).
10.3 THE CONSTRUCTORS AND DESTRUCTOR
Here is the implementation of the default constructor:
String: :String(unsigned n) : len(n) 1 buf = new char[len+l]; for (int i = 0; i < len; i++ ) buf[i] = ' '; buf[len] = '\O';
YIt constructs a String object containing n blanks. If no parameter is passed, then n takes the default value 0 and the empty string is constructed.
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