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How to create and use a 2D vector within a class?

MisterTams (125)
Hey guys,
I am trying to get into the swing of Object Oriented Programming and with that said, I am making a Tic Tac Toe game just for the fun of it but I'm trying to pretty strictly use classes/objects. I've made several Tic Tac Toe games before when using more linear/procedural source code. However I am a little bit stuck. I tried to create a 2D array as a private member of my class and I now know that this isn't really possible. So I turned to vectors which I've seen from other resources to be my answer. But when I tried to make a 2D Vector equivalent to a 2D Array I've been running into some issues. I can't seem to get the equivalent to a basic 2D array which I could easily do\using arrays.

Here is my header file for my class so far...

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#ifndef GAME_H
#define GAME_H
#include <vector>
#include <iostream>
using namespace std;

class Game
{

private:
	char Player1Symbol;
	char Player2Symbol;
	int row;
	int col;
	vector <vector <char>> PrintBoard; //equivalent to a 2D array

public:
	Game(int PlayerChoice, const int Row, const int Col)
	{
		if (PlayerChoice == 1)
		{
			Player1Symbol = 'X';
			Player2Symbol = 'O';
		}
		else if (PlayerChoice == 2)
		{
			Player1Symbol = 'O';
			Player2Symbol = 'X';
		}

		row = Row;
		col = Col;
		PrintBoard[row][col];
		
	}

	void SetGameBoard()
	{
		PrintBoard[0][0] = '1', PrintBoard[0][1] = '2', PrintBoard[0][2] = '3';
		PrintBoard[1][0] = '4', PrintBoard[1][1] = '5', PrintBoard[1][2] = '6';
		PrintBoard[2][0] = '7', PrintBoard[2][1] = '8', PrintBoard[2][2] = '9';
	}

	void PrintGameBoard()
	{
		cout << endl;
		for (int x = 0; x <= row; x++)
		{
			for (int y = 0; y <= col; y++)
			{
				cout << "|" << PrintBoard[x][y] << "|";
			}
			cout << endl;
		}
	}



};

#endif


Every time I compile/build and then run it,I get a nasty Debug Assertion Failed!
It states: Expression: Vector Subscript out of range.
Earlier I think this failure was even causing me to enter a breakpoint?
Basically an error would show up and I couldn't rerun the program.
I would have tried to stop Debugging but after that I would get a constant LINK error for the .exe file.
Which I don't understand.
Clearly my logic must be wrong somewhere and I am surely out of bounds for that vector.

I simply want a vector that is similar/equivalent to an array like this one.

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const int Row = 3;
const int Col = 3;

char PrintBoard [Row][Col] =
{
{'1', '2', '3'},
{'4', '5', '6'},
{'7', '8', '9'}
};


I even tried to initialize the vector in a similar fashion to this. ^
But the syntax didn't work. I think it said that I had to many arguments or something along those lines.

So now I am left with this, since my original train of thought didn't work when initializing...
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void SetGameBoard()
	{
		PrintBoard[0][0] = '1', PrintBoard[0][1] = '2', PrintBoard[0][2] = '3';
		PrintBoard[1][0] = '4', PrintBoard[1][1] = '5', PrintBoard[1][2] = '6';
		PrintBoard[2][0] = '7', PrintBoard[2][1] = '8', PrintBoard[2][2] = '9';
	}


^ Is this even proper for a 2D vector? ^

I also have a side question that isn't a great priority but I was wondering if there is any easy way to change the system background and font colors without using system(); (since I've read that it is frowned upon...) If the explanation is too much of a hassle for this little additional question, please ignore it.

Thanks,
MisterTams
Last edited on
JLBorges (13770)
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#include <vector>
#include <iostream>

struct Game
{
    std::vector< std::vector<char> > board = // provide a default member initialiser
    {
        {'1', '2', '3'},
        {'4', '5', '6'},
        {'7', '8', '9'}
    };

    std::ostream& print_board( std::ostream& stm = std::cout ) const
    {
        for( const auto& row : board )
        {
            for( char c : row ) stm << c << ' ' ;
            stm << '\n' ;
        }
        return stm << '\n' ;
    }
};

int main()
{
    Game g ;
    g.print_board() ;
}

http://coliru.stacked-crooked.com/a/fcf754ebd24c4734
MisterTams (125)
JLBorges,

Strange because I tried exactly that type of initializing and it didn't work for me the first time around. Working good now! :)
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