-IDManager

-times counting for tests

source/ecs/id_manager.d

@@ -0,0 +1,65 @@
+module ecs.id_manager;
+
+import ecs.entity;
+import ecs.vector;
+
+struct IDManager
+{
+    EntityID getNewID()
+    {
+        while(m_next_id >= m_ids_array.length)m_ids_array.add(Data());
+        EntityID id;
+        id.id = m_next_id;
+        id.counter = m_ids_array[m_next_id].counter++;
+        m_next_id = m_ids_array[m_next_id].next_id;
+        if(m_next_id == uint.max)m_next_id = cast(uint)m_ids_array.length;
+        return id;
+    }
+
+    void releaseID(EntityID id)
+    {
+        Data* data = &m_ids_array[id.id];
+        if(data.counter != id.counter)return;
+        data.next_id = m_next_id;
+        data.entity = null;
+        m_next_id = id.id;
+    }
+
+    void update(ref Entity entity)
+    {
+        m_ids_array[entity.id.id].entity = &entity;
+    }
+
+    struct Data
+    {
+        uint counter = 0;
+        uint next_id = uint.max;
+        Entity* entity = null;
+    }
+
+    private uint m_next_id = 0;
+    Vector!Data m_ids_array;
+}
+
+unittest
+{
+    IDManager manager;
+    EntityID id1 = manager.getNewID();
+    EntityID id2 = manager.getNewID();
+    EntityID id3 = manager.getNewID();
+
+    assert(id1 == EntityID(0,1));
+    assert(id2 == EntityID(1,1));
+    assert(id3 == EntityID(2,1));
+
+    manager.releaseID(id2);
+    manager.releaseID(id1);
+
+    id2 = manager.getNewID();
+    id1 = manager.getNewID();
+
+    assert(id1 == EntityID(1,2));
+    assert(id2 == EntityID(0,2));
+    assert(id3 == EntityID(2,1));
+
+}