What is heap data member?

Answer 1

//Heap Data Member

//Demonstrates an object with a dynamically allocated data member

#include

<iostream>

#include

<string>

using

namespace std;

class

Critter

{

public

:

Critter(

const string& name = "")

{

cout <<

"Constructor called\n";

m_pName =

new string(name);

}

~Critter()

//destructor

{

cout <<

"Destructor called\n";

delete

m_pName;

}

Critter(

const Critter& c) //copy constructor

{

cout <<

"Copy Constructor called\n";

m_pName =

new string;

*m_pName =

c.GetName();

}

Critter

& operator=(const Critter& c) //overloaded assignment operator

{

cout <<

"Overloaded Assignment Operator called\n";

if

(this == &c)

{

return

*this;

}

else

{

*m_pName =

c.GetName();

return

*this;

}

}

string

GetName() const { return *m_pName; }

void

SetName(const string& name = "") { *m_pName = name; }

void

SayHi() const { cout << "Hi, my name is " << GetName() << "\n"; }

private

:

string

* m_pName;

};

void

testDestructor();

void

testCopyConstructor(Critter copy);

void

testAssignmentOp();

int

main()

{

testDestructor();

cout << endl;

Critter

crit("Poochie");

crit.SayHi();

testCopyConstructor(crit);

cout << endl;

testAssignmentOp();

return

0;

}

void

testDestructor()

{

Critter

crit("Rover");

crit.SayHi();

}

//passing object by value invokes its copy constructor

void

testCopyConstructor(Critter copy)

{

copy

.SayHi();

}

void

testAssignmentOp()

{

Critter

crit1("crit1");

Critter

crit2("crit2");

crit1 = crit2;

crit1.SayHi();

crit2.SayHi();

cout <<

"Setting name of crit1 back to 'crit1'\n";

crit1.SetName(

"crit1");

crit1.SayHi();

crit2.SayHi();

Critter

crit("crit");

crit = crit;

}