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#include<iostream>
#include<string>
#include<cassert>
#include<iomanip>
using namespace std;
//***********************************************************
// Author: D.S. Malik
//
// This class specifies the members to implement the basic
// properties of array-based lists.
//***********************************************************
class newString
{
friend ostream& operator<<(ostream&, const newString&);
friend istream& operator>>(istream&, newString&);
public:
const newString& operator=(const newString&);
//Overloads the assignment operator
newString(const char*);
const newString & operator+(const newString&);
newString();
//newString(const newString&); //copy constructor
~newString();
char &operator[] (int);
const char& operator[] (int) const;
const newString &operator+=(const newString&);
int listSize() const;
//Function to determine the number of elements in the list
//Postcondition: Returns the value of length.
int maxListSize() const;
//Function to determine the size of the list.
//Postcondition: Returns the value of maxSize.
void print() const;
//Function to output the elements of the list
//Postcondition: Elements of the list are output on the
// standard output device.
void insertAt(int location, const string & insertItem);
//Function to insert an item in the list at the
//position specified by location. The item to be inserted
//is passed as a parameter to the function.
//Postcondition: Starting at location, the elements of the
// list are shifted down, list[location] = insertItem;,
// and length++;. If the list is full or location is
// out of range, an appropriate message is displayed.
//arrayListType(int size = 100);
newString(char size = 100);
//constructor
//Creates an array of the size specified by the
//parameter size. The default array size is 100.
//Postcondition: The list points to the array, length = 0,
// and maxSize = size
newString(const newString& );
//copy constructor
//~newString();
//destructor
//Deallocates the memory occupied by the array.
protected:
string *list; //array to hold the list elements
int length; //to store the length of the list
int maxSize; //to store the maximum size of the list
char *strPtr; //pointer to the char array
//that holds the string
int strLength; //data member to store the length
// of the string
};
newString::newString(const char *str)
{
strLength = strlen(str);
strPtr = new char(strLength + 1);
assert(strPtr != NULL);
strcpy(strPtr, str);
}
int newString::listSize() const
{
return length;
}
int newString::maxListSize() const
{
return maxSize;
}
void newString::print() const
{
for (int i = 0; i < length; i++)
cout << list[i] << " ";
cout << endl;
}
void newString::insertAt
(int location, const string& insertItem)
{
if (location < 0 || location >= maxSize)
cerr << "The position of the item to be inserted "
<< "is out of range" << endl;
else
if (length >= maxSize) //list is full
cerr << "Cannot insert in a full list" << endl;
else
{
for (int i = length; i > location; i--)
list[i] = list[i - 1]; //move the elements down
list[location] = insertItem; //insert the item at the
//specified position
length++; //increment the length
}
} //end insertAt
newString::newString(char size)
{
if (size <= 0)
{
cerr << "The array size must be positive. Creating "
<< "an array of size 100. " << endl;
maxSize = 100;
}
else
maxSize = size;
length = 0;
list = new string[maxSize];
assert(list != NULL);
}
newString::~newString()
{
delete [] list;
}
newString::newString
(const newString& otherList)
{
maxSize = otherList.maxSize;
length = otherList.length;
list = new string[maxSize]; //create the array
assert(list != NULL); //terminate if unable to allocate
//memory space
for (int j = 0; j < length; j++) //copy otherList
list [j] = otherList.list[j];
} //end copy constructor
const newString& newString::operator=
(const newString& otherList)
{
if (this != &otherList) //avoid self-assignment
{
delete [] list;
maxSize = otherList.maxSize;
length = otherList.length;
list = new string[maxSize]; //create the array
assert(list != NULL); //if unable to allocate memory
//space, terminate the program
for (int i = 0; i < length; i++)
list[i] = otherList.list[i];
}
return *this;
}
const newString &newString::operator+(const newString &rightStr)
{
strcat(strPtr, rightStr.strPtr);
}
//const newString &newString::operator+=(const newString &rightStr)
//{
// strPtr += rightStr;
//}
//Overload the insertion operator <<
ostream& operator<<(ostream& osObject, const newString& str)
{
osObject << str.strPtr;
return osObject;
}
//Overload the extraction operator >>
istream& operator>>(istream& isObject, newString &str)
{
char temp[81];
isObject >> setw(81) >> temp;
str = temp;
return isObject;
}
int main()
{
//overloadOprPlus s1, s2, s3;
newString s1 = "Hello " ;
newString s2 = "there ";
newString s3 = " ";
s3 = s1 + s2;
cout << s3;
}
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