diff --git a/src/knx/simple_functional.h b/src/knx/simple_functional.h
deleted file mode 100644
index c43b77a..0000000
--- a/src/knx/simple_functional.h
+++ /dev/null
@@ -1,88 +0,0 @@
-#pragma once
-
-//
-// Basis is https://shaharmike.com/cpp/naive-std-function/
-//
-// It uses a few bytes on the heap for functor object.
-// Copy assignment just copies the pointer to the functor object and does not create a new copy! The last one has to cleanup.
-// Do not forget to call cleanup() once you do not need the function object (functor) anymore to free the memory.
-// No move semantics and/or smart pointers are used.
-
-template <typename T>
-class function;
-
-template <typename ReturnValue, typename... Args>
-class function<ReturnValue(Args...)>
-{
-  public:
-    function()
-    {
-        //printf("function()\n");
-        callable_ = nullptr;
-    }
-
-    ~function()
-    {
-        //printf("~function()\n");
-    }
-
-    template<typename T>
-    function(T t)
-    {
-        //printf("function(T)\n");
-        callable_ = new CallableT<T>(t);
-    }
-
-    template <typename T>
-    function& operator=(T t)
-    {
-        //printf("operator=(T)\n");
-        callable_ = new CallableT<T>(t);
-        return *this;
-    }
-
-    ReturnValue operator()(Args... args) const
-    {
-        //assert(callable_);
-        if (callable_ == nullptr)
-        {
-            while (true);
-        }
-        return callable_->Invoke(args...);
-    }
-
-    void cleanup()
-    {
-        delete callable_;
-        callable_ = nullptr;
-    }
-
-  private:
-    class ICallable
-    {
-    public:
-        virtual ~ICallable() = default;
-        virtual ReturnValue Invoke(Args...) = 0;
-    };
-
-    template <typename T>
-    class CallableT : public ICallable
-    {
-      public:
-        CallableT(const T& t)
-            : t_(t) {
-        }
-
-        ~CallableT() override = default;
-
-        ReturnValue Invoke(Args... args) override
-        {
-            return t_(args...);
-        }
-
-      private:
-        T t_;
-    };
-
-    ICallable* callable_;
-};