From 2018ba27aef26c5f389772a49a4f051ea5d95ee5 Mon Sep 17 00:00:00 2001
From: sippeangelo <holmberg.simon@gmail.com>
Date: Sun, 13 Dec 2015 19:59:25 +0100
Subject: [PATCH] Added KnowsEntity function to ComponentPool to query whether
 an entity has a component attached

---
 include/Engine/Core/ComponentPool.h | 2 ++
 src/Engine/Core/ComponentPool.cpp   | 6 ++++++
 2 files changed, 8 insertions(+)

diff --git a/include/Engine/Core/ComponentPool.h b/include/Engine/Core/ComponentPool.h
index f0d53864..8dd8dc29 100644
--- a/include/Engine/Core/ComponentPool.h
+++ b/include/Engine/Core/ComponentPool.h
@@ -54,6 +54,8 @@ public:
     ComponentWrapper Allocate(EntityID entity);
     // Get the component belonging to a specific entity
     ComponentWrapper GetByEntity(EntityID ent);
+    // Returns true if the pool contains a component for the specified entity
+    bool KnowsEntity(EntityID ent);
     // Delete a component and free its memory
     void Delete(ComponentWrapper& wrapper);
 
diff --git a/src/Engine/Core/ComponentPool.cpp b/src/Engine/Core/ComponentPool.cpp
index 146b33f6..ef7f9740 100644
--- a/src/Engine/Core/ComponentPool.cpp
+++ b/src/Engine/Core/ComponentPool.cpp
@@ -50,6 +50,12 @@ ComponentWrapper ComponentPool::GetByEntity(EntityID ent)
     return ComponentWrapper(m_ComponentInfo, m_EntityToComponent.at(ent));
 }
 
+
+bool ComponentPool::KnowsEntity(EntityID ent)
+{
+    return m_EntityToComponent.find(ent) != m_EntityToComponent.end();
+}
+
 void ComponentPool::Delete(ComponentWrapper& wrapper)
 {
     m_EntityToComponent.erase(wrapper.EntityID);