From 070cd89d2ed140594608d252318f444202579a52 Mon Sep 17 00:00:00 2001
From: Zack Mulgrew <zack@zackthehuman.com>
Date: Wed, 3 Feb 2016 23:49:41 -0800
Subject: Trigger ComponentRemovedEvent for each component before destroying

---
 entityx/Entity.h          | 6 ++++--
 entityx/EntityClass.h     | 1 +
 entityx/help/Pool.h       | 7 +++++++
 entityx/help/Pool_test.cc | 3 ++-
 4 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/entityx/Entity.h b/entityx/Entity.h
index 8e1e93e..2ef01f7 100644
--- a/entityx/Entity.h
+++ b/entityx/Entity.h
@@ -381,12 +381,14 @@ class EntityManager : entityx::help::NonCopyable {
     assert_valid(entity);
     uint32_t index = entity.index();
     auto mask = entity_component_mask_[entity.index()];
-    event_manager_.emit<EntityDestroyedEvent>(Entity(this, entity));
     for (size_t i = 0; i < component_pools_.size(); i++) {
       BasePool *pool = component_pools_[i];
-      if (pool && mask.test(i))
+      if (pool && mask.test(i)) {
+        pool->removeComponent(Entity(this, entity));
         pool->destroy(index);
+      }
     }
+    event_manager_.emit<EntityDestroyedEvent>(Entity(this, entity));
     entity_component_mask_[index].reset();
     entity_version_[index]++;
     free_list_.push_back(index);
diff --git a/entityx/EntityClass.h b/entityx/EntityClass.h
index 444e494..94a2a02 100644
--- a/entityx/EntityClass.h
+++ b/entityx/EntityClass.h
@@ -10,6 +10,7 @@
 
 #pragma once
 
+#include <bitset>
 #include "entityx/config.h"
 
 namespace entityx {
diff --git a/entityx/help/Pool.h b/entityx/help/Pool.h
index f217ec2..c4b7d83 100644
--- a/entityx/help/Pool.h
+++ b/entityx/help/Pool.h
@@ -14,6 +14,8 @@
 #include <cassert>
 #include <vector>
 
+#include "entityx/EntityClass.h"
+
 namespace entityx {
 
 /**
@@ -63,6 +65,7 @@ class BasePool {
   }
 
   virtual void destroy(std::size_t n) = 0;
+  virtual void removeComponent(Entity entity) = 0;
 
  protected:
   std::vector<char *> blocks_;
@@ -90,6 +93,10 @@ class Pool : public BasePool {
     T *ptr = static_cast<T*>(get(n));
     ptr->~T();
   }
+
+  virtual void removeComponent(Entity entity) override {
+    entity.remove<T>();
+  }
 };
 
 }  // namespace entityx
diff --git a/entityx/help/Pool_test.cc b/entityx/help/Pool_test.cc
index 56ca85a..08ef1d2 100644
--- a/entityx/help/Pool_test.cc
+++ b/entityx/help/Pool_test.cc
@@ -13,8 +13,9 @@
 #include <vector>
 #include "entityx/3rdparty/catch.hpp"
 #include "entityx/help/Pool.h"
+#include "entityx/Entity.h"
 
-struct Position {
+struct Position : public entityx::Component<Position> {
   explicit Position(int *ptr = nullptr) : ptr(ptr) {
     if (ptr) (*ptr)++;
   }
-- 
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