Struggling to cout vector when using classes

[ramp00]

I'm currently trying to make a blackjack game, and I try to cout different values to check if I'm on the right path. I'm new to classes, and I don't really understand how to use them correctly yet.
But my question is how I can cout vector elements in "playBlackjack()"
I currently get a red line under the "<<" in "playBlackjack()" with the "no operator "<<" matches these operands. Operand types are: std::ostream << Card" error.

void Blackjack::dealerDraw() {
	CardDeck cd;
	Card dealerCard = cd.drawCard();
	dealerHand.push_back(dealerCard);
}

void playBlackjack() {
	Blackjack bj;
	bj.dealerDraw();
        cout << bj.dealerHand[0];
}

Classes:

class Card {
private:
	Rank r;
	Suit s;
	bool valid;
	
public:
	Card(Suit suit, Rank rank);
	Card();
	Suit getSuit();
	Rank getRank();
	bool isValid();
	string toString();
	string toStringShort();
};

class CardDeck {
private:
	vector<Card> cards;
	int currentCardIndex;
public:
	CardDeck();
	void fillDeck();
	void swap(int en, int to);
	void print();
	void printShort();
	void shuffle();
	const Card& drawCard(); 

};

class Blackjack {
private:

public:
	vector<Card> dealerHand;
	vector<Card> playerHand;
	void dealerDraw();
	void playerDraw();
};

[H00G0]

You have no overloaded operator << for the class Card. You need one since the vector element you're trying to display is of Card type, or you need a display function within that card class to display its variables

also in your card class what are Rank and Suit?

[ramp00]

First of all, thanks for answering!
Ah okey, do you have an example on how I can overload the operator << (don't know if I use the terminology correctly, so sorry for that) or how to set up a display function?
I don't understand how to implement the tips:/

Oh yeah sorry, forgot to include that..

enum class Suit {
	clubs,diamonds,hearts,spades
};

enum class Rank{
	two = 2, three, four, five, six, seven, eight, nine, ten, jack, queen, king, ace
};

[Grime]

Both your data members are private. What are you trying to display?

When your data members are private, you need a method to help you with displaying.

void printCard() {
   std::cout << "Rank: " << r << "\nSuit: " << s;
} // Should be inside the class, under public 

If your data members were public then you could overload the << operator to accept 'Card' type.

ostream& operator<<(ostream& os, const Card& card) {
    os << "Rank: " << card.r << "\nSuit: " << card.s;
    return os;
}

Cheers.

edit: Btw if your data members were public then you could also do this

std::cout << bj.dealerHand[0].r; // Rank of first member
std::cout << bj.dealerHand[0].s; // Suit of first member 

To display all elements of the vector:

for(size_t i = 0, size = bj.dealerHand.size(); i < size; i++) {
   std::cout << "Card No." << i << "\nRank: " << bj.dealerHand[i].r;
   std::cout << "\nSuit: " << bj.dealerHand[i].s << "\n\n";
}

[ramp00]

That cleared things up a bit.
Thanks!