From 99cae200fa62af1a2a6695129413691698f27184 Mon Sep 17 00:00:00 2001
From: Alec Thomas <alec@swapoff.org>
Date: Thu, 15 May 2014 12:56:25 -0400
Subject: Only delete assigned components.

Fixes #31.
---
 entityx/Entity.h       | 7 +++++--
 entityx/Entity_test.cc | 7 +++++++
 2 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/entityx/Entity.h b/entityx/Entity.h
index 7362f69..5f51b50 100644
--- a/entityx/Entity.h
+++ b/entityx/Entity.h
@@ -456,9 +456,12 @@ class EntityManager : entityx::help::NonCopyable {
   void destroy(Entity::Id entity) {
     assert_valid(entity);
     int index = entity.index();
+    auto mask = entity_component_mask_[entity.index()];
     event_manager_.emit<EntityDestroyedEvent>(Entity(this, entity));
-    for (BasePool *pool : component_pools_) {
-      if (pool) pool->destroy(index);
+    for (size_t i = 0; i < component_pools_.size(); i++) {
+      BasePool *pool = component_pools_[i];
+      if (pool && mask.test(i))
+        pool->destroy(index);
     }
     entity_component_mask_[index] = 0;
     entity_version_[index]++;
diff --git a/entityx/Entity_test.cc b/entityx/Entity_test.cc
index f40a9bc..1f87473 100644
--- a/entityx/Entity_test.cc
+++ b/entityx/Entity_test.cc
@@ -449,3 +449,10 @@ TEST_CASE_METHOD(EntityManagerFixture, "TestComponentHandleInvalidatedWhenCompon
   a.remove<Position>();
   REQUIRE(!position);
 }
+
+TEST_CASE_METHOD(EntityManagerFixture, "TestDeleteEntityWithNoComponents") {
+  Entity a = em.create();
+  a.assign<Position>(1, 2);
+  Entity b = em.create();
+  b.destroy();
+}
-- 
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