diff --git a/a8/promise.cc b/a8/promise.cc
index 4301210..d2a83e6 100644
--- a/a8/promise.cc
+++ b/a8/promise.cc
@@ -4,9 +4,4 @@
 namespace a8
 {
 
-    void CbPromise::DoAwait()
-    {
-        cb_(Awaiter::shared_from_this());
-    }
-
 }
diff --git a/a8/promise.h b/a8/promise.h
index 79bd4ce..9c6f6b8 100644
--- a/a8/promise.h
+++ b/a8/promise.h
@@ -9,17 +9,4 @@ namespace a8
     {
     };
 
-    class CbPromise : public Awaiter
-    {
-    public:
-        CbPromise(std::function<void (std::shared_ptr<a8::Awaiter>)> cb):Awaiter()
-        { cb_ = cb; }
-
-    protected:
-        virtual void DoAwait() override;
-
-    private:
-        std::function<void (std::shared_ptr<a8::Awaiter>)> cb_;
-    };
-
 }