/**** [10 points] The Bag_T class has two identical methods to release cats or d
ID: 644996 • Letter: #
Question
/****
[10 points]
The Bag_T class has two identical methods to release cats or dogs from the bag. The only difference is the data type of the released pets, Cat_T or Dog_T, and thus it is a good candidate for a templated function. Write the implementation of such template function, parametised with a generic type called <PetType_T>. Please note the the logic is identical to releaseCats or releaseDogs. The only difference is a generic type.
o The code for a template function must live in the .h file, not the .cpp file. No definition is needed. This is because such parametized code has to be pre-processed before it can be compiled.
*/
//Interface File for Pets
#ifndef PETS_H
#define PETS_H
#include <iostream>
#include <string>
#include <vector>
namespace csc161
{
class Pet_T
{
public:
// Counting on a default constructor
Pet_T(string p_name);
// Constructor sets name
// Destructor
~Pet_T();
// Accessors and Mutators
void setName(string p_name);
string getName() const;
// Pet introduces himself. Only concrete derived classes implement it
void virtual whoAmI() const;
//Overloads the >> operator for input values of type Pet_T. Optional
friend istream& operator >>(istream& ins, Pet_T& the_object);
//Precondition: If ins is a file input stream, then ins has already been
//connected to a file.
//Overloads the << operator for output values of type Pet_T.
friend ostream& operator <<(ostream& outs, const Pet_T& the_object);
//Precondition: If outs is a file output stream, then outs has already been
//connected to a file.
protected:
string name;
};
// Use 'typedef' to define a new type called PetPtr which is a pointer to Pet_T
typedef Pet_T* PetPtr;
class Cat_T : public Pet_T {
public:
// Constructor sets name
Cat_T(string p_name);
// Pet introduces himself: "My name is <name>. I am a cat."
void virtual whoAmI() const override;
/////////////////////////// EXAM TASK
// Declare a void function hairBall();
};
class Dog_T : public Pet_T {
public:
// Constructor sets name
Dog_T(string p_name);
// Pet introduces himself: "My name is <name>. I am a dog."
void virtual whoAmI() const override;
/////////////////////////// EXAM TASK
// Declare a void function squirell()
};
// EXAM TASK
// Add Frog_T class declaration
class Bag_T {
public:
// Not declaring a default constructor, the system will do that
// Contructor to sets size of Bag
Bag_T(unsigned p_capacity);
// Copy bag
Bag_T(const Bag_T& p_bag);
// Destructor
~Bag_T();
size_t getCapacity() const;
size_t getSize() const;
// Adds Pet to Bag
void addPet(PetPtr p_pet);
// Release Cats
void releaseCats();
// Release Dogs
void releaseDogs();
/////////////////////////////// EXAM TASK
// Template function to release pets, parametized on type of pet
template<typename PetType_T> void releasePets() {
};
// Print content of Bag
void petsInBag();
friend ostream& operator <<(ostream& outs, const Bag_T& the_object);
//Overloads the << operator for output content of type Bag_T.
//Precondition: If outs is a file output stream, then outs has already been
//connected to a file.
private:
vector<PetPtr> pets;
};
} // namespace csc161
#endif //PETS_H
//Implementation File for Pets.cpp
//Header file is in Pets.h
using namespace std;
#include <iostream>
#include <string>
#include "PetsInBag.h"
namespace csc161
{
// Contructor to sets name
Pet_T::Pet_T(string p_name) {
name = p_name;
};
//Pet_T::Pet_T() {};
// Destructor
Pet_T::~Pet_T() {};
void Pet_T::setName(string p_name) {
name = p_name;
}
string Pet_T::getName() const {
return name;
}
void Pet_T::whoAmI() const {};
istream& operator >>(istream& ins, Pet_T& the_object)
//Overloads the >> operator for input values of type Pet_T.
//Precondition: If ins is a file input stream, then ins has already been
//connected to a file.
{
{
cout << "Enter Pet's Name: ";
ins >> the_object.name;
return ins;
}
};
ostream& operator <<(ostream& outs, const Pet_T& the_object)
//Overloads the << operator for output values of type Pet_T.
//Precondition: If outs is a file output stream, then outs has already been
//connected to a file.
{
the_object.whoAmI();
outs << endl;
return outs;
}
// Cat_T implementation
Cat_T::Cat_T(string p_name) : Pet_T(p_name) {};
void Cat_T::whoAmI() const {
cout << "My name is " << name << ". I am a cat." << endl;
}
// Hair Ball!
void Cat_T::hairBall() {
/////////////////////////// EXAM TASK
// Cat says: "Hair ball!"
}
// Dog_T implementation
Dog_T::Dog_T(string p_name) : Pet_T(p_name) { };
void Dog_T::whoAmI() const {
cout << "My name is " << name << ". I am a dog." << endl;
}
void Dog_T::squirrel() {
///////////////////////// EXAM TASK
// Dog says "Squirrel!"
}
///////////////////////////// EXAM TASK
// Add Frog_T class implementation
///////////// Bag Implementation
// Contructor to sets size of Bag
Bag_T::Bag_T(unsigned p_capacity) {
pets.reserve(p_capacity);
};
// Returns bag's capacity
size_t Bag_T::getCapacity() const {
///////////////////////// EXAM TASK
// Return bag capacity
}
// Returns bag's size
size_t Bag_T::getSize() const {
/////////////////////////// EXAM TASK
// Return bag size
}
// Copy constructor: copies content of p_bag to a newly constructed bag
Bag_T::Bag_T(const Bag_T& p_bag) {
// Allocate new bag
pets.reserve(p_bag.getCapacity());
// Copy each pet
for (unsigned i = 0; i < p_bag.getSize(); i++) {
////////////////////////////////// EXAM TASK
// It could also be a Frog_T
Cat_T* catPointer = NULL;
Dog_T* dogPointer = NULL;
// To find whether basePointer is pointing to Derived type of object
// Runtime Type Identification (RTTI)
/////////////////////////////////// EXAM TASK
// It could also be a Frog_T
catPointer = dynamic_cast<Cat_T*>(p_bag.pets[i]);
dogPointer = dynamic_cast<Dog_T*>(p_bag.pets[i]);
if (catPointer != NULL) // Copies cat
{
pets.push_back(new Cat_T(*catPointer));
}
else
if (dogPointer != NULL) // Copies dog
{
pets.push_back(new Dog_T(*dogPointer));
}
///////////////////////////////// EXAM TASK
// It could also be a Frog_T
}
}
// Destructor
Bag_T::~Bag_T() {
for(int i = 0; i < pets.size(); i++) {
delete pets[i];
}
};
// Adds Pet to Bag
void Bag_T::addPet(PetPtr p_pet) {
if (pets.size() < pets.capacity())
pets.push_back(p_pet);
else
cout << "Bag is full" << endl;
}
// Release Cats
void Bag_T::releaseCats() {
Cat_T* catPointer = NULL;
for (unsigned i = 0; i < pets.size(); i++)
{
// To find whether base pointer is pointing to derived type of object
// Runtime Type Identification (RTTI)
catPointer = dynamic_cast<Cat_T*>(pets[i]);
if (catPointer != NULL) // It is a Cat!
{
//////////////////////////////// EXAM TASK
// As a cat gets released, it says "Hair Ball!"
// Now release that cat
delete pets[i];
pets.erase(pets.begin() + i);
i--;
}
}
}
// Release Dogs
void Bag_T::releaseDogs() {
Dog_T* dogPointer = NULL;
for (unsigned i = 0; i < pets.size(); i++)
{
// To find whether base pointer is pointing to derived type of object
// Runtime Type Identification (RTTI)
dogPointer = dynamic_cast<Dog_T*>(pets[i]);
if (dogPointer != NULL) // It is a dog!
{
//////////////////////// EXAM TASK
// As a dog gets released, it says "Squirrel!"
// Now release that dog
delete pets[i];
pets.erase(pets.begin() + i);
i--;
}
}
}
ostream& operator <<(ostream& outs, const Bag_T& the_object)
//Overloads the << operator for output values of type Bag_T.
//Precondition: If outs is a file output stream, then outs has already been
//connected to a file.
{
///////////////////////////////// EXAM TASK
// Check if bag is empty, and if so print "The bag is empty"
// Print bag content
for (unsigned i = 0; i < the_object.pets.size(); i++) {
outs << *(the_object.pets[i]);
};
return outs;
}
} // namespace csc161
// *********************************************************************
// This program models a bag with pets to demonstrate polymorphism
// It holds a vector of pointers to a generic Pet, but specific pets are added
// *********************************************************************
#include <iostream>
#include <cstdlib>
#include <string>
using namespace std;
#include "PetsInBag.h"
using namespace csc161;
///////////////////// FUNCTIONS PROTOTYPES
// Utility function to enter Pet's name
void enterName(string& p_name);
///////////////////// FUNCTIONS IMLEMENTATION
void enterName(string& p_name){
cout << "Enter Pet's Name: ";
cin >> p_name;
}
// ======================
// main function
// ======================
int main()
{
Bag_T bag(10); // Instantiates a Bag_T
string pet_name; // Variable to enter pet's name
int choice = -1;
// Main Menu
while (choice != 0)
{
cout << endl;
cout << "MAIN MENU" << endl;
cout << "0) Quit" << endl;
cout << "1) Add Cat" << endl;
cout << "2) Add Dog" << endl;
////////////////// EXAM TASK
cout << "4) Print Bag" << endl;
cout << "5) Release Cats" << endl;
cout << "6) Release Dogs" << endl;
cin >> choice;
switch (choice) {
case 1:
enterName(pet_name);
bag.addPet(new Cat_T(pet_name)); // Polymorphism: addPet is defined to add generic Pet_T, but passes in Cat_T
break;
case 2:
enterName(pet_name);
bag.addPet(new Dog_T(pet_name)); // Polymorphism: addPet is defined to add generic Pet_T, but passes in Dog_T
break;
////////////////// EXAM TASK
case 4:
cout << bag; // Prints content of Bag
break;
case 5:
bag.releaseCats();
break;
case 6:
bag.releaseDogs();
break;
default:
break;
};
}
// To demo the copy constructor
Bag_T new_bag = Bag_T(bag);
cout << new_bag;
system("pause");
return 0;
}
Explanation / Answer
#ifndef PETS_H
#define PETS_H
#include <iostream>
#include <string>
#include <vector>
namespace csc161
{
class Pet_T
{
public:
// Counting on a default constructor
Pet_T(string p_name);
// Constructor sets name
// Destructor
~Pet_T();
// Accessors and Mutators
void setName(string p_name);
string getName() const;
// Pet introduces himself. Only concrete derived classes implement it
void virtual whoAmI() const;
//Overloads the >> operator for input values of type Pet_T. Optional
friend istream& operator >>(istream& ins, Pet_T& the_object);
//Precondition: If ins is a file input stream, then ins has already been
//connected to a file.
//Overloads the << operator for output values of type Pet_T.
friend ostream& operator <<(ostream& outs, const Pet_T& the_object);
//Precondition: If outs is a file output stream, then outs has already been
//connected to a file.
protected:
string name;
};
// Use 'typedef' to define a new type called PetPtr which is a pointer to Pet_T
typedef Pet_T* PetPtr;
class Cat_T : public Pet_T {
public:
// Constructor sets name
Cat_T(string p_name);
// Pet introduces himself: "My name is <name>. I am a cat."
void virtual whoAmI() const override;
/////////////////////////// EXAM TASK
// Declare a void function hairBall();
};
class Dog_T : public Pet_T {
public:
// Constructor sets name
Dog_T(string p_name);
// Pet introduces himself: "My name is <name>. I am a dog."
void virtual whoAmI() const override;
/////////////////////////// EXAM TASK
// Declare a void function squirell()
};
// EXAM TASK
// Add Frog_T class declaration
class Bag_T {
public:
// Not declaring a default constructor, the system will do that
// Contructor to sets size of Bag
Bag_T(unsigned p_capacity);
// Copy bag
Bag_T(const Bag_T& p_bag);
// Destructor
~Bag_T();
size_t getCapacity() const;
size_t getSize() const;
// Adds Pet to Bag
void addPet(PetPtr p_pet);
// Release Cats
void releaseCats();
// Release Dogs
void releaseDogs();
/////////////////////////////// EXAM TASK
// Template function to release pets, parametized on type of pet
template<typename PetType_T> void releasePets() {
};
// Print content of Bag
void petsInBag();
friend ostream& operator <<(ostream& outs, const Bag_T& the_object);
//Overloads the << operator for output content of type Bag_T.
//Precondition: If outs is a file output stream, then outs has already been
//connected to a file.
private:
vector<PetPtr> pets;
};
} // namespace csc161
#endif //PETS_H
//Implementation File for Pets.cpp
//Header file is in Pets.h
using namespace std;
#include <iostream>
#include <string>
#include "PetsInBag.h"
namespace csc161
{
// Contructor to sets name
Pet_T::Pet_T(string p_name) {
name = p_name;
};
//Pet_T::Pet_T() {};
// Destructor
Pet_T::~Pet_T() {};
void Pet_T::setName(string p_name) {
name = p_name;
}
string Pet_T::getName() const {
return name;
}
void Pet_T::whoAmI() const {};
istream& operator >>(istream& ins, Pet_T& the_object)
//Overloads the >> operator for input values of type Pet_T.
//Precondition: If ins is a file input stream, then ins has already been
//connected to a file.
{
{
cout << "Enter Pet's Name: ";
ins >> the_object.name;
return ins;
}
};
ostream& operator <<(ostream& outs, const Pet_T& the_object)
//Overloads the << operator for output values of type Pet_T.
//Precondition: If outs is a file output stream, then outs has already been
//connected to a file.
{
the_object.whoAmI();
outs << endl;
return outs;
}
// Cat_T implementation
Cat_T::Cat_T(string p_name) : Pet_T(p_name) {};
void Cat_T::whoAmI() const {
cout << "My name is " << name << ". I am a cat." << endl;
}
// Hair Ball!
void Cat_T::hairBall() {
/////////////////////////// EXAM TASK
// Cat says: "Hair ball!"
}
// Dog_T implementation
Dog_T::Dog_T(string p_name) : Pet_T(p_name) { };
void Dog_T::whoAmI() const {
cout << "My name is " << name << ". I am a dog." << endl;
}
void Dog_T::squirrel() {
///////////////////////// EXAM TASK
// Dog says "Squirrel!"
}
///////////////////////////// EXAM TASK
// Add Frog_T class implementation
///////////// Bag Implementation
// Contructor to sets size of Bag
Bag_T::Bag_T(unsigned p_capacity) {
pets.reserve(p_capacity);
};
// Returns bag's capacity
size_t Bag_T::getCapacity() const {
///////////////////////// EXAM TASK
// Return bag capacity
}
// Returns bag's size
size_t Bag_T::getSize() const {
/////////////////////////// EXAM TASK
// Return bag size
}
// Copy constructor: copies content of p_bag to a newly constructed bag
Bag_T::Bag_T(const Bag_T& p_bag) {
// Allocate new bag
pets.reserve(p_bag.getCapacity());
// Copy each pet
for (unsigned i = 0; i < p_bag.getSize(); i++) {
////////////////////////////////// EXAM TASK
// It could also be a Frog_T
Cat_T* catPointer = NULL;
Dog_T* dogPointer = NULL;
// To find whether basePointer is pointing to Derived type of object
// Runtime Type Identification (RTTI)
/////////////////////////////////// EXAM TASK
// It could also be a Frog_T
catPointer = dynamic_cast<Cat_T*>(p_bag.pets[i]);
dogPointer = dynamic_cast<Dog_T*>(p_bag.pets[i]);
if (catPointer != NULL) // Copies cat
{
pets.push_back(new Cat_T(*catPointer));
}
else
if (dogPointer != NULL) // Copies dog
{
pets.push_back(new Dog_T(*dogPointer));
}
///////////////////////////////// EXAM TASK
// It could also be a Frog_T
}
}
// Destructor
Bag_T::~Bag_T() {
for(int i = 0; i < pets.size(); i++) {
delete pets[i];
}
};
// Adds Pet to Bag
void Bag_T::addPet(PetPtr p_pet) {
if (pets.size() < pets.capacity())
pets.push_back(p_pet);
else
cout << "Bag is full" << endl;
}
// Release Cats
void Bag_T::releaseCats() {
Cat_T* catPointer = NULL;
for (unsigned i = 0; i < pets.size(); i++)
{
// To find whether base pointer is pointing to derived type of object
// Runtime Type Identification (RTTI)
catPointer = dynamic_cast<Cat_T*>(pets[i]);
if (catPointer != NULL) // It is a Cat!
{
//////////////////////////////// EXAM TASK
// As a cat gets released, it says "Hair Ball!"
// Now release that cat
delete pets[i];
pets.erase(pets.begin() + i);
i--;
}
}
}
// Release Dogs
void Bag_T::releaseDogs() {
Dog_T* dogPointer = NULL;
for (unsigned i = 0; i < pets.size(); i++)
{
// To find whether base pointer is pointing to derived type of object
// Runtime Type Identification (RTTI)
dogPointer = dynamic_cast<Dog_T*>(pets[i]);
if (dogPointer != NULL) // It is a dog!
{
//////////////////////// EXAM TASK
// As a dog gets released, it says "Squirrel!"
// Now release that dog
delete pets[i];
pets.erase(pets.begin() + i);
i--;
}
}
}
ostream& operator <<(ostream& outs, const Bag_T& the_object)
//Overloads the << operator for output values of type Bag_T.
//Precondition: If outs is a file output stream, then outs has already been
//connected to a file.
{
///////////////////////////////// EXAM TASK
// Check if bag is empty, and if so print "The bag is empty"
// Print bag content
for (unsigned i = 0; i < the_object.pets.size(); i++) {
outs << *(the_object.pets[i]);
};
return outs;
}
} // namespace csc161
// *********************************************************************
// This program models a bag with pets to demonstrate polymorphism
// It holds a vector of pointers to a generic Pet, but specific pets are added
// *********************************************************************
#include <iostream>
#include <cstdlib>
#include <string>
using namespace std;
#include "PetsInBag.h"
using namespace csc161;
///////////////////// FUNCTIONS PROTOTYPES
// Utility function to enter Pet's name
void enterName(string& p_name);
///////////////////// FUNCTIONS IMLEMENTATION
void enterName(string& p_name){
cout << "Enter Pet's Name: ";
cin >> p_name;
}
// ======================
// main function
// ======================
int main()
{
Bag_T bag(10); // Instantiates a Bag_T
string pet_name; // Variable to enter pet's name
int choice = -1;
// Main Menu
while (choice != 0)
{
cout << endl;
cout << "MAIN MENU" << endl;
cout << "0) Quit" << endl;
cout << "1) Add Cat" << endl;
cout << "2) Add Dog" << endl;
////////////////// EXAM TASK
cout << "4) Print Bag" << endl;
cout << "5) Release Cats" << endl;
cout << "6) Release Dogs" << endl;
cin >> choice;
switch (choice) {
case 1:
enterName(pet_name);
bag.addPet(new Cat_T(pet_name)); // Polymorphism: addPet is defined to add generic Pet_T, but passes in Cat_T
break;
case 2:
enterName(pet_name);
bag.addPet(new Dog_T(pet_name)); // Polymorphism: addPet is defined to add generic Pet_T, but passes in Dog_T
break;
////////////////// EXAM TASK
case 4:
cout << bag; // Prints content of Bag
break;
case 5:
bag.releaseCats();
break;
case 6:
bag.releaseDogs();
break;
default:
break;
};
}
// To demo the copy constructor
//Bag_T new_bag = Bag_T(bag);//remove this line
cout << new_bag;
system("pause");
return 0;
}
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