Added KnowsEntity function to ComponentPool to query whether an entity has a component attached

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);
 

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);