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diff --git a/lib/etl/parameter_type.h b/lib/etl/parameter_type.h
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+///\file
+
+/******************************************************************************
+The MIT License(MIT)
+
+Embedded Template Library.
+https://github.com/ETLCPP/etl
+http://www.etlcpp.com
+
+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_PARAMETER__
+#define __ETL_PARAMETER__
+
+#include "type_traits.h"
+
+namespace etl
+{
+  //*************************************************************************
+  /// Determine how to pass parameters.
+  //*************************************************************************
+  template <typename T, const bool should_pass_by_value = is_fundamental<T>::value || is_pointer<T>::value>
+  struct parameter_type;
+
+  //*************************************************************************
+  /// Pass by value.
+  //*************************************************************************
+  template <typename T>
+  struct parameter_type<T, true>
+  {
+    typedef T type;
+  };
+
+  //*************************************************************************
+  /// Pass by const reference.
+  //*************************************************************************
+  template <typename T>
+  struct parameter_type<T, false>
+  {
+    typedef const T& type;
+  };
+}
+
+#endif