Basic and working entity system with a really ugly test case

src/Engine/Core/World.cpp

@@ -0,0 +1,54 @@
+#include "Core/World.h"
+
+World::~World()
+{
+    for (auto& pool : m_ComponentPools) {
+        delete pool.second;
+    }
+}
+
+EntityID World::CreateEntity(EntityID parent /*= 0*/)
+{
+    EntityID newEntity = generateEntityID();
+    m_EntityParents[newEntity] = parent;
+    if (parent != 0) {
+        m_EntityChildren.insert(std::make_pair(parent, newEntity));
+    }
+    return newEntity;
+}
+
+void World::RegisterComponent(ComponentInfo& ci)
+{
+    m_ComponentPools[ci.Name] = new ComponentPool(ci);
+}
+
+ComponentWrapper World::AttachComponent(EntityID entity, std::string componentType)
+{
+    ComponentPool* pool = m_ComponentPools.at(componentType);
+    const ComponentInfo& ci = pool->ComponentInfo();
+
+    // Allocate space for the component
+    ComponentWrapper c = pool->Allocate(entity);
+    // Write default values
+    memcpy(c.Data, ci.Defaults.get(), ci.Meta.Stride);
+
+    return c;
+}
+
+ComponentWrapper World::GetComponent(EntityID entity, std::string componentType)
+{
+    ComponentPool* pool = m_ComponentPools.at(componentType);
+    return pool->GetByEntity(entity);
+}
+
+const ComponentPool& World::GetComponents(std::string componentType)
+{
+    return *m_ComponentPools.at(componentType);
+}
+
+EntityID World::generateEntityID()
+{
+    // TODO: Make EntityID generation smarter
+    return m_CurrentEntityID++;
+}
+