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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>>(istrealn&, String&); friend String operator+(const String&, const String&); public: String(unsigned =0); // default constructor String(char, unsigned); // constructor String(const char*); // constructor String(const String&); // copy constructor ~String ( ); // destructor String& operator=(const String&); // assignment String& operator+=(const String&); // append operator char* ( ) const; // converstion char& operator[] (unsigned) const; // subscript unsigned length ( ) const; // access method private: unsigned len; // number of non-null characters char* buf; // actual character string }
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The Constructors and Destructor Here is the implementation of the three constructors. The first constructs a String object containing n blanks. If no parameter is passed, then n becomes the default 0 and the null string is constructed. String::String(unsigned n) : len(n) { buf = new char[len+l];
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for (int i=0; i<ten; i++) buf[i]=' '; buf[len] = '\0'; } The second constructor creates a string of identical characters. String: :String(char c, unsigned n) : len(n) ( buf = new char[len+l]; for (int i=0; i<len; i++) buf[i] = c; buf[len] = '\0'; } The third constructor converts a C-string into a String object. String::String(const char* s) { len = strlen(s) bur = new char [len+l]; for (int i=0; i<len; i++) buf[i] =s[i]; buf[len] = '\n'; } Example 10.1 Testing the Constructor The code invokes the default constructor twice: once with no parameter and once with length 4. It invokes the second constructor with 4 B's, and the third with with a string. String s1, s2(4), s3('B', 4), s4("Hello, World!"); cout <<"s1 = [" <<s1 <<"], len=" <<s1.length ( ); cout <<" s2 = [" <<s2 <<"], len=" <<s2.length ( ) <<endl; cout <<"s3 = [" <<s3 <<"], len=" <<s3.length ( ); cout <<" s4 = [" <<s4 <<"], len=" <<s4.length ( ) <<endl; sl = [ ], len=0 s3 = [BBBB], len=4 s2 = [ ], len=4 s4 = [Hello, World!], len=13
The destructor for our String class is typical: String::~String() { delete [] buf; } It uses the delete operator to release the object's memory. The sub-script operator [] must be specified because buf is an array.
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The Copy Constructor In many class definitions, instead of defining a copy constructor explicitly, we use the default which does a direct copy of each corresponding data member. This doesn't work for our String class because a direct memory copy would duplicate the buf pointer but not the string to which it points. This would yield two different objects with the same data. So, we define our own copy constructor: String::String(const String& s) :len(s.len) { buf = new char[len+l]; for (int i=0; i<s.len; i++) buf[i]=s.buf[i]; buf[len] ='\0'; }
This works the same way as the third constructor, except that the string it duplicates is an existing String object instead of a C-string. Also, we can use an initialization list to assign s. len to the new object's len field. That was not possible in the third constructor because we had to invoke a function (strlen()) to obtain the length of s. Example 10.2 Testing the Copy Constructor This test invokes the copy constructor twice: once when it initializes the object self, and once when it initializes the object sis: #include "String.h" void main() { String me("Jennifer"); cout <<"me = [" <<name <<"] \n"; String self = me; // calls copy constructor cout <<"self = [" <<self <<"] \n"; String sis = "Natalie B."; // calls 2 constructors cout <<"sis = [" <<sis <<"]\n"; } me = [Jennifer] self = [Jennifer] sis = [Natalie B.]
First it uses the third constructor to construct the String object me which duplicates the constant C-string "Jennifer." Then it uses the copy constructor to create the String object self that duplicates the String object me by being initialized by it. The last declaration uses both constructors to construct the String object sis. First it uses
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