Function move_snake

src/examples/rpp/sfml/snake/snake.cpp:29–49

}

static SnakeBody move_snake(SnakeBody&& body, const std::tuple<Direction, size_t>& direction_and_length)
{
    auto head = body.back();

    const auto& [direction, length] = direction_and_length;

    if (length == body.size()) // no any changes
        std::rotate(body.begin(), body.begin() + 1, body.end());
    else
        body.push_back(head);

    head.x += direction.x;
    head.x = wrap_coordinate(head.x, s_columns_count);

    head.y += direction.y;
    head.y = wrap_coordinate(head.y, s_rows_count);

    body.back() = head;

    return std::move(body);
}

static bool is_snake_eat_self(const SnakeBody& body)
{