1 files changed, 25 insertions, 4 deletions
diff --git a/yage/entity/entity.h b/yage/entity/entity.h
index 2aa31a66..93bea8fb 100644
--- a/yage/entity/entity.h
+++ b/yage/entity/entity.h
@@ -1,9 +1,12 @@
 #pragma once
 
-#include <vector>
-
 #include "component.h"
 
+#include <functional>
+#include <iostream>
+#include <memory>
+#include <vector>
+
 namespace yage
 {
 
@@ -24,17 +27,35 @@ public:
     Entity create_entity();
     EntityManager &delete_entity(Entity entity);
     bool is_valid(Entity entity) const;
-    EntityManager &add_component(Entity entity, BaseComponent *component);
+    EntityManager &add_component(Entity entity,
+                                 std::unique_ptr<BaseComponent> &&component);
+    template <typename T>
+    EntityManager &each(std::function<void(T &)> update);
 
 private:
     Entity update_next_entity();
 
     Entity next_entity_ = 0;
 
-public:
     std::vector<ComponentGroup> component_group_;
     std::vector<ComponentMask> component_masks_;
     std::vector<Entity> deleted_;
 };
 
+template <typename T>
+EntityManager &EntityManager::each(std::function<void(T &)> update)
+{
+    T c;
+    auto id = static_cast<BaseComponent *>(&c)->getGroup();
+    for (auto it = component_group_[id].begin();
+         it != component_group_[id].end(); ++it) {
+        auto iteration = it - component_group_[id].begin();
+        if (is_valid(iteration) && component_masks_[iteration][id]) {
+            update(*static_cast<T *>((*it).get()));
+        }
+    }
+
+    return *this;
+}
+
 } // namespace yage