1 files changed, 40 insertions, 0 deletions
diff --git a/yage/entity/entity.cpp b/yage/entity/entity.cpp
new file mode 100644
index 00000000..050514c3
--- /dev/null
+++ b/yage/entity/entity.cpp
@@ -0,0 +1,40 @@
+#include "entity.h"
+
+#include <algorithm>
+
+namespace yage
+{
+
+Entity EntityManager::create_entity()
+{
+    Entity entity = update_next_entity();
+    component_masks_.push_back(ComponentMask(0));
+    return entity;
+}
+
+EntityManager &EntityManager::delete_entity(Entity entity)
+{
+    deleted_.push_back(entity);
+    return *this;
+}
+
+bool EntityManager::is_valid(Entity entity) const
+{
+    auto it = std::find(deleted_.begin(), deleted_.end(), entity);
+    if (it == deleted_.end()) {
+        return true;
+    }
+    return false;
+}
+
+Entity EntityManager::update_next_entity()
+{
+    if (deleted_.empty()) {
+        return ++next_entity_;
+    }
+    next_entity_ = deleted_.back();
+    deleted_.pop_back();
+    return next_entity_;
+}
+
+} // namespace yage