C++ Lab4 Deck

#ifndef DECK_HPP
#define DECK_HPP

#include <iostream>
#include <vector>
#include <cstdlib>
#include <ctime>
#include <algorithm> // random_shuffle
#include "Card.hpp"
using namespace std;

//------------
class Deck {
public:
    Deck();
    int getNumCards() const;
    Card* drawCard();
    void shuffle();
    void clear();
private:
    vector<Card*> cards;
    void swapCards(int i, int j);
};

Deck::Deck() {
    for (int r = 13; r >= 1; --r)
        for (int s = 3; s >= 0; --s)
            cards.push_back(new Card((Rank)r, (Suit)s));
}

int Deck::getNumCards() const {
    return cards.size();
}

Card* Deck::drawCard() {
    Card* cardPtr = cards.back();
    cards.pop_back();
    return cardPtr;
}

// SHUFFLE CARD IN DECK
void Deck::shuffle() {
    srand((unsigned)time(NULL));
    std::random_shuffle(cards.begin(), cards.end());
    //http://www.cplusplus.com/reference/algorithm/random_shuffle/
}

void Deck::swapCards(int i, int j) {
    Card* temp = cards[i];
    cards[i] = cards[j];
    cards[j] = temp;
}

void Deck::clear() {
    cout << "Clear deck:\n";
    while (cards.size() > 0) {
        (cards.back())->show();
        cout << " ";
        delete cards.back();
        cards.pop_back();
    }
    cout << "\n\n";
}
#endif