C++ (C plusplus) Please note that all defined classes must declare data members as private.Given the following "Item" class#include class Item{public:virtual intvirtual boolgetId() = 0;isActive() = 0;virtual bool isSame(Item & item) = 0;virtual std::string toString() = 0;};Please answer the following questions.1. Define a new exception class named "InvalidItemException" that accepts areason code (integer) to describe the error: 1 (id cannot be negative), 2(description cannot be empty).2. Define a new class named "Event" that must derive from the given Item class.This class manages Event info: id (integer), the description (string) and the status(bool).It will allow the Event info to be printed out as shown in the following examples:ID(12345) DESC(Final Exam) STATUS(ACTIVE)ID(12346) DESC(Winter Break) STATUS(ACTIVE)ID(12347) DESC(Project) STATUS(INACTIVE)This class must prevent the creation of the Event object when the id is negative orthe description is empty by generating an "InvalidItemException" error with theproper reason code (1 or 2).Two events are the same when only the event ids are the same.3. Define a new class named "Holiday" that must inherit from the Event class. Thisclass manages Holiday info: id (integer) and the description (string) but its statusis always "ACTIVE". Its output example isID(12348) DESC(Christmas) STATUS(ACTIVE)4. Write a function named "getOnly ActiveItems" that accepts a vector of Itemobject pointers. It will go through the list and return the list of Item object pointers(to Event or Holiday objects) with ACTIVE status.5. Write the main program to demonstrate the usage of all the classes and methodsthat you have written:Create and print out Event and Holiday objectsCompare them using "isSame" methodsHandle exceptions for both invalid id and empty description by checking thereason code and printing out the corresponding error message.Call getOnly ActiveItems method with the list of mixed Event and Holidayobjects.

Dear Student, The source code, implementation and expected output is given below -#include <iostream>#include <string>#include <vector> using namespace std; //Exception class for invalid Item objectsclass InvalidItemException { private: int reasonCode; //reason code for error public: //Constructor InvalidItemException(int code) : reasonCode(code) {} //Getter for reason code int getReasonCode() const { return reasonCode; }}; //Base Item classclass Item { private: int id; //Item id public: //Constructor Item(int id) : id(id) {} //Getter for id int getId() const { return id; } //Virtual method for checking active status virtual bool isActive() = 0; //Virtual method for comparing two Items virtual bool isSame(Item &item) = 0; //Virtual method for printing out the Item virtual string toString() = 0;}; //Event class derived from Itemclass Event : public Item { public: string desc; //Event description bool status; //Event status public: //Constructor Event(int id, string desc, bool status) : Item(id), desc(desc), status(status) { //Invalid item exception if the id is negative or description is empty if (id < 0) { throw InvalidItemException(1); } else if (desc.empty()) { throw InvalidItemException(2); } } //Getter for status bool isActive() { return status; } //Method for comparing two Events bool isSame(Item &item) { //Check if item is an Event if (Event *event = dynamic_cast<Event *>(&item)) { //Compare the ids if (getId() == event->getId()) { return true; } } return false; } //Method for printing out the Event string toString() { string stat; if (status) { stat = "ACTIVE"; } else { stat = "INACTIVE"; } return "ID(" + to_string(getId()) + ") DESC(" + desc + ") STATUS(" + stat + ")"; }}; //Holiday class derived from Eventclass Holiday : public Event { public: //Constructor Holiday(int id, string desc) : Event(id, desc, true) {} //Method for printing out the Holiday string toString() { return "ID(" + to_string(getId()) + ") DESC(" + desc + ") STATUS(ACTIVE)"; }}; //Function for getting only active Items vector<Item*> getOnlyActiveItems( vector<Item*> items) { vector<Item*> activeItems; for (Item *item : items) { if (item->isActive()) { activeItems.push_back(item); } } return activeItems;} //Main programint main() { try { //Create Events Event *event1 = new Event(12345, "Final Exam", true); Event *event2 = new Event(12346, "Winter Break", true); Event *event3 = new Event(12347, "Project", false); //Create Holiday Holiday *holiday1 = new Holiday(12348, "Christmas"); //Print out Events and Holiday cout << event1->toString() << endl; cout << event2->toString() << endl; cout << event3->toString() << endl; cout << holiday1->toString() << endl; //Compare Events and Holiday if (event1->isSame(*event2)) { cout << event1->toString() << " is the same as " << event2->toString() << endl; } else { cout << event1->toString() << " is not the same as " << event2->toString() << endl; } if (event1->isSame(*holiday1)) { cout << event1->toString() << " is the same as " << holiday1->toString() << endl; } else { cout << event1->toString() << " is not the same as " << holiday1->toString() << endl; } //Create list of Events and Holiday vector<Item*> items {event1, event2, event3, holiday1}; //Print out only active Items vector<Item*> activeItems = getOnlyActiveItems(items); cout << "Active Items:" << endl; for (Item *item : activeItems) { cout << item->toString() << endl; } //Clean up delete event1; delete event2; delete event3; delete holiday1; } catch (InvalidItemException ex) { //Print out the error message if (ex.getReasonCode() == 1) { cout << "Error: id cannot be negative" << endl; } else if (ex.getReasonCode() == 2) { cout << "Error: description cannot be empty" << endl; } } return 0;}