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diff --git a/lib/entityx/examples/example.cc b/lib/entityx/examples/example.cc
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--- a/lib/entityx/examples/example.cc
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@@ -1,412 +0,0 @@
-/**
- * This is an example of using EntityX.
- *
- * It is an SFML2 application that spawns 100 random circles on a 2D plane
- * moving in random directions. If two circles collide they will explode and
- * emit particles.
- *
- * This illustrates a bunch of EC/EntityX concepts:
- *
- * - Separation of data via components.
- * - Separation of logic via systems.
- * - Use of events (colliding bodies trigger a CollisionEvent).
- *
- * Compile with:
- *
- *    c++ -I.. -O3 -std=c++11 -Wall -lsfml-system -lsfml-window -lsfml-graphics -lentityx example.cc -o example
- */
-#include <cmath>
-#include <unordered_set>
-#include <sstream>
-#include <cstdlib>
-#include <memory>
-#include <string>
-#include <vector>
-#include <iostream>
-#include <SFML/Window.hpp>
-#include <SFML/Graphics.hpp>
-#include <entityx/entityx.h>
-
-using std::cerr;
-using std::cout;
-using std::endl;
-
-namespace ex = entityx;
-
-
-float r(int a, float b = 0) {
-  return static_cast<float>(std::rand() % (a * 1000) + b * 1000) / 1000.0;
-}
-
-
-struct Body {
-  Body(const sf::Vector2f &position, const sf::Vector2f &direction, float rotationd = 0.0)
-    : position(position), direction(direction), rotationd(rotationd), alpha(0.0) {}
-
-  sf::Vector2f position;
-  sf::Vector2f direction;
-  float rotation = 0.0, rotationd, alpha;
-};
-
-
-using Renderable = std::shared_ptr<sf::Shape>;
-
-
-struct Particle {
-  explicit Particle(sf::Color colour, float radius, float duration)
-      : colour(colour), radius(radius), alpha(colour.a), d(colour.a / duration) {}
-
-  sf::Color colour;
-  float radius, alpha, d;
-};
-
-
-struct Collideable {
-  explicit Collideable(float radius) : radius(radius) {}
-
-  float radius;
-};
-
-
-// Emitted when two entities collide.
-struct CollisionEvent {
-  CollisionEvent(ex::Entity left, ex::Entity right) : left(left), right(right) {}
-
-  ex::Entity left, right;
-};
-
-
-class SpawnSystem : public ex::System<SpawnSystem> {
-public:
-  explicit SpawnSystem(sf::RenderTarget &target, int count) : size(target.getSize()), count(count) {}
-
-  void update(ex::EntityManager &es, ex::EventManager &events, ex::TimeDelta dt) override {
-    int c = 0;
-    ex::ComponentHandle<Collideable> collideable;
-    es.each<Collideable>([&](ex::Entity entity, Collideable&) { ++c; });
-
-    for (int i = 0; i < count - c; i++) {
-      ex::Entity entity = es.create();
-
-      // Mark as collideable (explosion particles will not be collideable).
-      collideable = entity.assign<Collideable>(r(10, 5));
-
-      // "Physical" attributes.
-      entity.assign<Body>(
-        sf::Vector2f(r(size.x), r(size.y)),
-        sf::Vector2f(r(100, -50), r(100, -50)));
-
-      // Shape to apply to entity.
-      Renderable shape(new sf::CircleShape(collideable->radius));
-      shape->setFillColor(sf::Color(r(128, 127), r(128, 127), r(128, 127), 0));
-      shape->setOrigin(collideable->radius, collideable->radius);
-      entity.assign<Renderable>(shape);
-    }
-  }
-
-private:
-  sf::Vector2u size;
-  int count;
-};
-
-
-// Updates a body's position and rotation.
-struct BodySystem : public ex::System<BodySystem> {
-  void update(ex::EntityManager &es, ex::EventManager &events, ex::TimeDelta dt) override {
-    const float fdt = static_cast<float>(dt);
-    es.each<Body>([fdt](ex::Entity entity, Body &body) {
-      body.position += body.direction * fdt;
-      body.rotation += body.rotationd * fdt;
-      body.alpha = std::min(1.0f, body.alpha + fdt);
-    });
-  };
-};
-
-
-// Bounce bodies off the edge of the screen.
-class BounceSystem : public ex::System<BounceSystem> {
-public:
-  explicit BounceSystem(sf::RenderTarget &target) : size(target.getSize()) {}
-
-  void update(ex::EntityManager &es, ex::EventManager &events, ex::TimeDelta dt) override {
-    es.each<Body>([this](ex::Entity entity, Body &body) {
-      if (body.position.x + body.direction.x < 0 ||
-          body.position.x + body.direction.x >= size.x)
-        body.direction.x = -body.direction.x;
-      if (body.position.y + body.direction.y < 0 ||
-          body.position.y + body.direction.y >= size.y)
-        body.direction.y = -body.direction.y;
-    });
-  }
-
-private:
-  sf::Vector2u size;
-};
-
-
-// Determines if two Collideable bodies have collided. If they have it emits a
-// CollisionEvent. This is used by ExplosionSystem to create explosion
-// particles, but it could be used by a SoundSystem to play an explosion
-// sound, etc..
-//
-// Uses a fairly rudimentary 2D partition system, but performs reasonably well.
-class CollisionSystem : public ex::System<CollisionSystem> {
-  static const int PARTITIONS = 200;
-
-  struct Candidate {
-    sf::Vector2f position;
-    float radius;
-    ex::Entity entity;
-  };
-
-public:
-  explicit CollisionSystem(sf::RenderTarget &target) : size(target.getSize()) {
-    size.x = size.x / PARTITIONS + 1;
-    size.y = size.y / PARTITIONS + 1;
-  }
-
-  void update(ex::EntityManager &es, ex::EventManager &events, ex::TimeDelta dt) override {
-    reset();
-    collect(es);
-    collide(events);
-  };
-
-private:
-  std::vector<std::vector<Candidate>> grid;
-  sf::Vector2u size;
-
-  void reset() {
-    grid.clear();
-    grid.resize(size.x * size.y);
-  }
-
-  void collect(ex::EntityManager &entities) {
-    entities.each<Body, Collideable>([this](ex::Entity entity, Body &body, Collideable &collideable) {
-      unsigned int
-          left = static_cast<int>(body.position.x - collideable.radius) / PARTITIONS,
-          top = static_cast<int>(body.position.y - collideable.radius) / PARTITIONS,
-          right = static_cast<int>(body.position.x + collideable.radius) / PARTITIONS,
-          bottom = static_cast<int>(body.position.y + collideable.radius) / PARTITIONS;
-        Candidate candidate {body.position, collideable.radius, entity};
-        unsigned int slots[4] = {
-          left + top * size.x,
-          right + top * size.x,
-          left  + bottom * size.x,
-          right + bottom * size.x,
-        };
-        grid[slots[0]].push_back(candidate);
-        if (slots[0] != slots[1]) grid[slots[1]].push_back(candidate);
-        if (slots[1] != slots[2]) grid[slots[2]].push_back(candidate);
-        if (slots[2] != slots[3]) grid[slots[3]].push_back(candidate);
-    });
-  }
-
-  void collide(ex::EventManager &events) {
-    for (const std::vector<Candidate> &candidates : grid) {
-      for (const Candidate &left : candidates) {
-        for (const Candidate &right : candidates) {
-          if (left.entity == right.entity) continue;
-          if (collided(left, right))
-            events.emit<CollisionEvent>(left.entity, right.entity);
-        }
-      }
-    }
-  }
-
-  float length(const sf::Vector2f &v) {
-    return std::sqrt(v.x * v.x + v.y * v.y);
-  }
-
-  bool collided(const Candidate &left, const Candidate &right) {
-    return length(left.position - right.position) < left.radius + right.radius;
-  }
-};
-
-
-// Fade out and then remove particles.
-class ParticleSystem : public ex::System<ParticleSystem> {
-public:
-  void update(ex::EntityManager &es, ex::EventManager &events, ex::TimeDelta dt) override {
-    es.each<Particle>([dt](ex::Entity entity, Particle &particle) {
-      particle.alpha -= particle.d * dt;
-      if (particle.alpha <= 0) {
-        entity.destroy();
-      } else {
-        particle.colour.a = particle.alpha;
-      }
-    });
-  }
-};
-
-
-// Renders all explosion particles efficiently as a quad vertex array.
-class ParticleRenderSystem : public ex::System<ParticleRenderSystem> {
-public:
-  explicit ParticleRenderSystem(sf::RenderTarget &target) : target(target) {}
-
-  void update(ex::EntityManager &es, ex::EventManager &events, ex::TimeDelta dt) override {
-    sf::VertexArray vertices(sf::Quads);
-    es.each<Particle, Body>([&vertices](ex::Entity entity, Particle &particle, Body &body) {
-      const float r = particle.radius;
-      // Spin the particles.
-      sf::Transform transform;
-      transform.rotate(body.rotation);
-      vertices.append(sf::Vertex(body.position + transform.transformPoint(sf::Vector2f(-r, -r)), particle.colour));
-      vertices.append(sf::Vertex(body.position + transform.transformPoint(sf::Vector2f(r, -r)), particle.colour));
-      vertices.append(sf::Vertex(body.position + transform.transformPoint(sf::Vector2f(r, r)), particle.colour));
-      vertices.append(sf::Vertex(body.position + transform.transformPoint(sf::Vector2f(-r, r)), particle.colour));
-    });
-    target.draw(vertices);
-  }
-private:
-  sf::RenderTarget &target;
-};
-
-
-// For any two colliding bodies, destroys the bodies and emits a bunch of bodgy explosion particles.
-class ExplosionSystem : public ex::System<ExplosionSystem>, public ex::Receiver<ExplosionSystem> {
-public:
-  void configure(ex::EventManager &events) override {
-    events.subscribe<CollisionEvent>(*this);
-  }
-
-  void update(ex::EntityManager &es, ex::EventManager &events, ex::TimeDelta dt) override {
-    for (ex::Entity entity : collided) {
-      emit_particles(es, entity);
-      entity.destroy();
-    }
-    collided.clear();
-  }
-
-  void emit_particles(ex::EntityManager &es, ex::Entity entity) {
-    ex::ComponentHandle<Body> body = entity.component<Body>();
-    ex::ComponentHandle<Renderable> renderable = entity.component<Renderable>();
-    ex::ComponentHandle<Collideable> collideable = entity.component<Collideable>();
-    sf::Color colour = (*renderable)->getFillColor();
-    colour.a = 200;
-
-    float area = (M_PI * collideable->radius * collideable->radius) / 3.0;
-    for (int i = 0; i < area; i++) {
-      ex::Entity particle = es.create();
-
-      float rotationd = r(720, 180);
-      if (std::rand() % 2 == 0) rotationd = -rotationd;
-
-      float offset = r(collideable->radius, 1);
-      float angle = r(360) * M_PI / 180.0;
-      particle.assign<Body>(
-        body->position + sf::Vector2f(offset * cos(angle), offset * sin(angle)),
-        body->direction + sf::Vector2f(offset * 2 * cos(angle), offset * 2 * sin(angle)),
-        rotationd);
-
-      float radius = r(3, 1);
-      particle.assign<Particle>(colour, radius, radius / 2);
-    }
-  }
-
-  void receive(const CollisionEvent &collision) {
-    // Events are immutable, so we can't destroy the entities here. We defer
-    // the work until the update loop.
-    collided.insert(collision.left);
-    collided.insert(collision.right);
-  }
-
-private:
-  std::unordered_set<ex::Entity> collided;
-};
-
-
-// Render all Renderable entities and draw some informational text.
-class RenderSystem  :public ex::System<RenderSystem> {
-public:
-  explicit RenderSystem(sf::RenderTarget &target, sf::Font &font) : target(target) {
-    text.setFont(font);
-    text.setPosition(sf::Vector2f(2, 2));
-    text.setCharacterSize(18);
-    text.setColor(sf::Color::White);
-  }
-
-  void update(ex::EntityManager &es, ex::EventManager &events, ex::TimeDelta dt) override {
-    es.each<Body, Renderable>([this](ex::Entity entity, Body &body, Renderable &renderable) {
-      sf::Color fillColor = renderable->getFillColor();
-      fillColor.a = sf::Uint8(body.alpha * 255);
-      renderable->setFillColor(fillColor);
-      renderable->setPosition(body.position);
-      renderable->setRotation(body.rotation);
-      target.draw(*renderable.get());
-    });
-    last_update += dt;
-    frame_count++;
-    if (last_update >= 0.5) {
-      std::ostringstream out;
-      const double fps = frame_count / last_update;
-      out << es.size() << " entities (" << static_cast<int>(fps) << " fps)";
-      text.setString(out.str());
-      last_update = 0.0;
-      frame_count = 0.0;
-    }
-    target.draw(text);
-  }
-
-private:
-  double last_update = 0.0;
-  double frame_count = 0.0;
-  sf::RenderTarget &target;
-  sf::Text text;
-};
-
-
-class Application : public ex::EntityX {
-public:
-  explicit Application(sf::RenderTarget &target, sf::Font &font) {
-    systems.add<SpawnSystem>(target, 500);
-    systems.add<BodySystem>();
-    systems.add<BounceSystem>(target);
-    systems.add<CollisionSystem>(target);
-    systems.add<ExplosionSystem>();
-    systems.add<ParticleSystem>();
-    systems.add<RenderSystem>(target, font);
-    systems.add<ParticleRenderSystem>(target);
-    systems.configure();
-  }
-
-  void update(ex::TimeDelta dt) {
-    systems.update_all(dt);
-  }
-};
-
-
-
-int main() {
-  std::srand(std::time(nullptr));
-
-  sf::RenderWindow window(sf::VideoMode::getDesktopMode(), "EntityX Example", sf::Style::Fullscreen);
-  sf::Font font;
-  if (!font.loadFromFile("LiberationSans-Regular.ttf")) {
-    cerr << "error: failed to load LiberationSans-Regular.ttf" << endl;
-    return 1;
-  }
-
-  Application app(window, font);
-
-  sf::Clock clock;
-  while (window.isOpen()) {
-    sf::Event event;
-    while (window.pollEvent(event)) {
-      switch (event.type) {
-        case sf::Event::Closed:
-        case sf::Event::KeyPressed:
-          window.close();
-          break;
-
-        default:
-          break;
-      }
-    }
-
-    window.clear();
-    sf::Time elapsed = clock.restart();
-    app.update(elapsed.asSeconds());
-    window.display();
-  }
-}