Need help determining the winner of this game

Okay so, I have the program working using vectors, but I can't seem to figure out how to make a winner, the program closes as soon as someone gets tic tac toe.
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#include <iostream>
#include <vector>


using namespace std;

struct playerInfo
{
	char playerName[81];
	char playerID;
};
void PlayerWin(playerInfo activePlayer);
void draw_board(const vector<vector<char> >& vec)
{
	cout << "    0   1   2  \n";
	cout << "  +---+---+---+\n";
	for (int i = 0; i < vec.size(); i++)
	{
		cout << i << " ";
		for (int j = 0; j < vec[i].size(); j++)
		{
			std::cout << "| " << vec[i][j] << " ";
		}
		cout << "|";
		cout << '\n';
		cout << "  +---+---+---+\n";
	}
}

void enter(int row, int col, char ch, std::vector< std::vector<char> >& vec)
{
	vec[row][col] = ch;
}

bool check(const vector<vector<char> >& vec)
{
	//to check diagonals
	if ((vec[0][0] == 'X' && vec[1][1] == 'X' && vec[2][2] == 'X')
		|| (vec[0][2] == 'X' && vec[1][1] == 'X' && vec[2][0] == 'X'))
	{
		std::cout << "Player X won this game\n";
		return true;
	}
	else if ((vec[0][0] == 'O' && vec[1][1] == 'O' && vec[2][2] == 'O')
		|| (vec[0][2] == 'O' && vec[1][1] == 'O' && vec[2][0] == 'O'))
	{
		std::cout << "Player O won this game\n";
		return true;
	}

	//to check horizonatal and vertical
	for (int i = 0; i < vec.size(); i++)
	{
		if ((vec[i][0] == 'X' && vec[i][1] == 'X' && vec[i][2] == 'X')
			|| (vec[0][i] == 'X' && vec[1][i] == 'X' && vec[2][i] == 'X'))
		{
			std::cout << "Player X won this game\n";
			return true;
		}
		else if ((vec[i][0] == 'O' && vec[i][1] == 'O' && vec[i][2] == 'O')
			|| (vec[0][i] == 'O' && vec[1][i] == 'O' && vec[2][i] == 'O'))
		{
			std::cout << "Player O won this game\n";
			return true;
		}
	}
}

void start(vector<vector<char>>& vec)
{
	int row, col, res = 0;
	char ch;

	std::vector<int> index = { 0, 1, 2 };

	for (int i = 0; i < vec.size(); i++)
	{
		for (int j = 0; j < vec[i].size(); j++)
		{
			vec[i][j] = ' ';
		}
	}

	for (int i = 0; i < 9;)
	{
		if (i == 0 || i % 2 == 0)
		{
			ch = 'X';
			cout << "Chance to enter X\n";
		}
		else
		{
			ch = 'O';
			cout << "Chance to enter O\n";
		}
		cout << "Enter row number ";
		cin >> row;
		cout << "Enter column number ";
		cin >> col;
		if (vec[row][col] == ' ' || vec[row][col] == ' ')
		{
			enter(row, col, ch, vec);
			draw_board(vec);
			if (i >= 2)
			{
				res = check(vec);
				if (res == 1)
				{
					break;
				}
			}
			i++;
		}
		else
		{
			cerr << "This position already contains a character\n"; // I found this on a website we used for the connect 4 game, and it came in hany
		}

	}
	if (res == 0)
	{
		std::cout << "This game draws\n";
	}


}
void PlayerWin(playerInfo activePlayer)
{
	cout << endl << activePlayer.playerName << " Tic Tac Toe, You Win!" << endl;
}



int main()
{

	

	playerInfo playerOne, playerTwo;
	
	cout << "Player One please enter your name: ";
	cin >> playerOne.playerName;
	playerOne.playerID = 'X';
	cout << "Player Two please enter your name: ";
	cin >> playerTwo.playerName;
	playerTwo.playerID = 'O';
	
vector< std::vector<char> > board(3, std::vector<char>(3));
	draw_board(board);
	start(board);
	void PlayerWin(playerInfo activePlayer);
	
}
nvm I didn't have system("pause) doi
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