Answered: Implement the copy assignment operator=…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

Implement the copy assignment operator= for the StringVar class using the options given on the right side window. Place the code into the left side using the arrows. It is possible to get the test case correct but not complete

NOTE: Be careful! There are decoys! The this pointer is used extensively..

Assume that StringVar.h has the following declaration:

#include <iostream>

class StringVar {
public:
StringVar() : max_length(20) { // Default constructor size is 20
value = new char[max_length+1];
value[0] = '\0';
}

StringVar(int size); // Takes an int for size

StringVar(const char cstr[]); // Takes a c-string and copies it

StringVar(const StringVar& strObj); // Copy Constructor

~StringVar(); // Destructor

int size() const { return max_length; } // Access capacity

const char* c_str() const { return value; } // Access value

int length() const { return strlen(value); } // Access length

StringVar& operator= (const StringVar& rightObj);

std::istream& operator>> (std::istream& in, StringVar& strVar);

std::ostream& operator<< (std::ostream& out, const StringVar& strVar);

private:
int max_length;
char* value;
};

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RESPONSE AREA
ANSWER BANK
Organize answer blocks in the proper order:
Move the necessary blocks over into the response area:
i strcpy(rightobj.value, value);
delete this->value;
this->max_length = rightobj.length();
if (this !- &rightObj) {
: StringVar *this;
return *this;
: if (c_str() < rightObj.c_str)) {
: if (*this == rightobj) {
10
: StringVar& StringVar::operator = (const StringVar& rightobj)
# // Copy Assignment operator= for StringVar class.
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# #include <cstring>
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}
: #include "StringVar.h"
if (this->max_1length < rightobj.length()) {
: if (length() < rightobj.size()) {
this->value - new char[this->max_length+1];
strcpy(this->value, rightobj.c_str());

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