Answer:
Twitter.h
========
#ifndef Twitter_h
#define Twitter_h
#include <iostream>
using std::string;
using std::cout;
using std::endl;
template <typename T>
class Twitter
{
private:
string name;
T followers[5];
int numFollowers;
public:
Twitter(string n);
bool AddFollower(T follower);
bool RemoveFollower(T follower);
void PrintFollowers();
};
template <typename T>
Twitter<T>::Twitter(string n)
{
name = n;
numFollowers = 0;
}
template <typename T>
bool Twitter<T>::AddFollower(T follower)
{
if(numFollowers < 5)
{
followers[numFollowers] = follower;
numFollowers++;
return true;
}
else
return false;
}
template <typename T>
bool Twitter<T>::RemoveFollower(T follower)
{
int index;
bool found = false;
for(index = 0; index < numFollowers; index++)
{
if(followers[index] == follower)
{
found = true;
break;
}
}
if(found)
{
//shift all other followers after the one to be removed to one position left
for(++index; index < numFollowers; ++index)
{
followers[index-1] = followers[index];
}
numFollowers--;
return true;
}
else
return false;
}
template <typename T>
void Twitter<T>::PrintFollowers()
{
cout << "Followers for " << name << endl;
for(int i = 0; i < numFollowers; i++)
cout << followers[i] << endl;
cout << "------" << endl << endl;
}
#endif /* Twitter_h */
main.cpp
=========
#include "Twitter.h"
#include <iostream>
using namespace std;
struct Profile {
string userName;
int age;
string state;
};
ostream& operator << (ostream & output, Profile p) {
output << p.userName;
return output;
}
bool operator == (const Profile &p1, const Profile p2)
{
return p1.userName == p2.userName;
}
int main()
{
Twitter<string> t1("John");
Twitter<Profile> t2("Bob");
cout << "Adding followers to John" << endl;
t1.AddFollower("Bill");
t1.AddFollower("Jack");
t1.PrintFollowers();
Profile p1 = {"Alice", 20, "Alaska"};
Profile p2 = {"Janet", 22, "California"};
Profile p3 = {"Jim", 20, "Texas"};
cout << "Adding follower profiles to Bob" << endl;
t2.AddFollower(p1);
t2.AddFollower(p2);
t2.AddFollower(p3);
t2.PrintFollowers();
cout << "Removing Bill from John" << endl;
t1.RemoveFollower("Bill");
cout << "Removing Janet's profile from Bob" << endl << endl;
t2.RemoveFollower(p2);
t1.PrintFollowers();
t2.PrintFollowers();
}
output
-======
Adding followers to John
Followers for John
Bill
Jack
------
Adding follower profiles to Bob
Followers for Bob
Alice
Janet
Jim
------
Removing Bill from John
Removing Janet's profile from Bob
Followers for John
Jack
------
Followers for Bob
Alice
Jim
------
Explanation:
