void Rudey_Level::Update(const SDL_Event* event_)
{
	using namespace SDL_Tools;

	SDL_Rect new_pos, old_pos;
	bool found_valid_move = false;
	
	/*std::copy(moves_shuffled.begin(), moves_shuffled.end(),
				std::ostream_iterator<DIRECTION>(std::cout, " "));*/

	if(Screen_Event_Manager::Empty())
	{ // No need to update yet.
		return;
	}

	for(enemy_it it = enemies.begin(); it != enemies.end(); ++it)
	{
		/* Move enemy. */
		if(Screen_Event_Manager::Find_First_Of("", TIMER))
		{ // Time to update.
			found_valid_move = false;
			old_pos = it->Get_Position();

			// shuffle array to randomise movement
			std::random_shuffle(moves_shuffled.begin(), moves_shuffled.end());

			for(int i = 0; i < QTY_DIRECTIONS && !found_valid_move; ++i)
			{ // Try to find a valid move.			
				new_pos = move_by(old_pos, distance_from_direction(
					DIRECTION_ARRAY, TILE_WIDTH, TILE_HEIGHT));

				if(Can_Move_To(*it, new_pos))
				{ // New position is inside level_boundary and
				  // not already taken by someone other than it..
					it->Move(DIRECTION_ARRAY);
					found_valid_move = true;
				}
			}
			// If we couldn't move anywhere... we stay where we are!
		}
	}
}

void Rudey_Game::Run()
{
	Rudey_Clock::Start(game_speed);

	while(!exit)
	{ // While the user hasn't exit
		if(SDL_PollEvent(&sdl_event) != 0)
		{ // There's an event to handle.
			if(sdl_event.type == SDL_QUIT)
			{ // If the user has Xed out
				exit = true;
				break;
			}
			else
			{
				rudey.Update(&sdl_event);
			}
		}

		Rudey_Clock::Update();

		game_screen.Update(&sdl_event);
		game_screen.Draw();

		level.Update(&sdl_event);
		level.Draw();
		rudey.Draw();

		Draw_Engine::Write(0,0,Conversions::to_string(Rudey_Clock::Get_Ticks()));

		Draw_Engine::Draw_Screen();
		
		// Handle events that control the game/app.
		Handle_Events();
	}
	// Exit.
}

namespace Direction
{
	// (n,e,s,w)
	const unsigned short QTY_DIRECTIONS = 4;

	typedef enum DIRECTION
	{
		NO_DIRECTION, START, NORTH, EAST, SOUTH, WEST
	};

	// Using an array prevents code from breaking if the element order of DIRECTION changes.
	const DIRECTION DIRECTION_ARRAY[QTY_DIRECTIONS] = {NORTH, EAST, SOUTH, WEST};

Rudey_Level::Rudey_Level()	:	rudey(NULL),	difficulty(0),	level_boundary(DEFAULT_LEVEL_BOUNDARY),	moves_shuffled(DIRECTION_ARRAY, DIRECTION_ARRAY + sizeof(*DIRECTION_ARRAY)){}Rudey_Level::Rudey_Level(	const std::string& directory,	const Rudey* rudey,	ushort difficulty,	const SDL_Rect& level_boundary)	:	directory(directory),	rudey(rudey),	difficulty(difficulty),	level_boundary(level_boundary),	moves_shuffled(DIRECTION_ARRAY, DIRECTION_ARRAY + sizeof(*DIRECTION_ARRAY)){	if(NULL == rudey)	{ // bad rudey!		throw std::runtime_error("Rudey was NULL in Rudey_Level::Rudey_Level.");	}	Create_Enemies();}I also just realised that I'm using DIRECTION_ARRAY not the moves_shuffled vector...new_pos = move_by(old_pos, distance_from_direction(					DIRECTION_ARRAY, TILE_WIDTH, TILE_HEIGHT));

std::random_shuffle(moves_shuffled.begin(), moves_shuffled.end());