std::vector<Tile*> World::GetAdjacentTiles(int currentXPos, int currentYPos) const
{
    std::vector<Tile*> adjacentTiles;

    //assert center tile is properly placed
    assert(currentXPos >= 0 && currentXPos < m_width);
    assert(currentYPos >= 0 && currentYPos < m_height);

    //forward tile
    assert(currentXPos >= 0 && (currentYPos - 1) < m_height);
    adjacentTiles.push_back(&m_ppGrid[currentXPos][currentYPos - 1]);

    //back tile
    assert(currentYPos + 1 >= 0 && (currentYPos + 1) < m_height);
    adjacentTiles.push_back(&m_ppGrid[currentXPos][currentYPos + 1]);

    //left tile
    assert(currentXPos - 1 >= 0 && (currentXPos - 1) < m_width);
    adjacentTiles.push_back(&m_ppGrid[currentXPos - 1][currentYPos]);

    //right tile
    assert(currentXPos + 1 >= 0 && (currentXPos + 1) < m_width);
    adjacentTiles.push_back(&m_ppGrid[currentXPos + 1][currentYPos]);

    //top left tile
    assert(currentXPos - 1 >= 0 && (currentYPos - 1) < m_width);
    assert(currentYPos - 1 >= 0 && (currentYPos - 1) < m_height);

    adjacentTiles.push_back(&m_ppGrid[currentXPos - 1][currentYPos - 1]);

    //top right tile
    assert(currentXPos + 1 >= 0 && (currentYPos + 1) < m_width);
    assert(currentYPos + 1 >= 0 && (currentYPos - 1) < m_height);

    adjacentTiles.push_back(&m_ppGrid[currentXPos + 1][currentYPos - 1]);


    //bottom left tile
    assert(currentXPos - 1 >= 0 && (currentYPos - 1) < m_width);
    assert(currentYPos + 1 >= 0 && (currentYPos + 1) < m_height);

    adjacentTiles.push_back(&m_ppGrid[currentXPos - 1][currentYPos + 1]);

    //bottom right tile
    assert(currentXPos + 1 >= 0 && (currentYPos + 1) < m_width);
    assert(currentYPos + 1 >= 0 && (currentYPos + 1) < m_height);

    adjacentTiles.push_back(&m_ppGrid[currentXPos + 1][currentYPos + 1]);

    return adjacentTiles;
}