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Help with a Console Battleship Game

Z e r e o (223)
Hello everyone, my professor just gave me assignment to make any boardgame we want using the console. He wants us to use OOP and make user of the STL also. I chose battleship and have set about making my class design but have run into a problem right at the beginning. I am trying to populate the gameboard which is a vector<vector<char>> with all 'O' as you can see using my size member (Like board[SIZE][SIZE]). But the code below is giving me a runtime error and I am not sure why. It seems logical to me.

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void GameBoard::populateBoard()
{
    for (unsigned i = 0; i != SIZE; ++i)
        for (unsigned j = 0; j != SIZE; ++j)
            board[i].push_back('O');
}


Anwyays was wondering if anyone could point out why it is doing this. I was also wondering something else. At first I wanted to make it so the GameBoard class's constructors took care of populating the vector but I didn't really know how. Thanks in advance for the help, and also I am not looking for complete answers to my problem but if you could atleast give me a hint that would be great.
Z e r e o (223)
Just a update I figured out how to get the function working but was still wondering if there would be a way to initialize the vector of vectors within the constructor.

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void GameBoard::populateBoard()
{
    for (unsigned i = 0; i != SIZE; ++i)
    {
        vector<char> temp;
        for (unsigned j = 0; j != SIZE; ++j)
        {
            temp.push_back('O');
        }

        board.push_back(temp);
    }
}
Danny Toledo (469)
http://www.cplusplus.com/reference/vector/vector/vector/

From what I gather from this sites reference section (link above), you can call the second constructor (read: second constructor listed on the provided link) to fill the vector with a specified number of a specified element. So something like:

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#include <vector>
#include <iostream>

int main()
{
    const int SIZE = 10;
    std::vector<std::vector<char> > vec;
    for (auto i = 0; i != SIZE; i++)
    {
        vec.push_back(std::vector<char>(100, 'O'));
    }
    
    for (auto i = 0; i != SIZE; i++)
    {
        for (auto j = 0; j != SIZE; j++)
        {
            std::cout<< "vec["<< i<< "]["<< j<< "]: "<< vec[i][j]<< std::endl;
        }
    }
    
    return 0;
}
 
vec[0][0]: O
vec[0][1]: O
vec[0][2]: O
[..]
vec[9][7]: O
vec[9][8]: O
vec[9][9]: O


Is that something like what you mean?
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