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+///\file
+
+/******************************************************************************
+The MIT License(MIT)
+
+Embedded Template Library.
+
+Copyright(c) 2014 jwellbelove
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files(the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and / or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions :
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+******************************************************************************/
+
+#ifndef __etl_functional__
+#define __etl_functional__
+
+///\defgroup functional functional
+///\ingroup Utilities
+
+///\defgroup reference_wrapper reference_wrapper
+///\ingroup functional
+
+namespace etl
+{
+  //***************************************************************************
+  /// A definition of reference_wrapper for those that don't have C++ 0x11 support.
+  ///\ingroup reference
+  //***************************************************************************
+  template <typename T>
+  class reference_wrapper
+  {
+  public:
+
+    typedef T type;
+
+    explicit reference_wrapper(T& t_)
+      : t(&t_)
+    {
+    }
+
+    operator T& () const
+    {
+      return *t;
+    }
+
+    T& get() const
+    {
+      return *t;
+    }
+
+    T* get_pointer() const
+    {
+      return t;
+    }
+
+  private:
+
+    T* t;
+  };
+
+  //***************************************************************************
+  template <typename T>
+  reference_wrapper<T> ref(T& t)
+  {
+    return reference_wrapper<T>(t);
+  }
+
+  //***************************************************************************
+  template <typename T>
+  reference_wrapper<T> ref(reference_wrapper<T> t)
+  {
+    return reference_wrapper<T>(t.get());
+  }
+
+  //***************************************************************************
+  template <typename T>
+  reference_wrapper<const T> cref(const T& t)
+  {
+    return reference_wrapper<const T>(t);
+  }
+
+  //***************************************************************************
+  template <typename T>
+  reference_wrapper<const T> cref(reference_wrapper<T> t)
+  {
+    return reference_wrapper<const T>(t.get());
+  }
+}
+
+#endif
+