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+//----------------------------------------------------------------------------
+/// @file traits.hpp
+/// @brief this file contains the metaprogramming classes compare_iter and
+/// enable_if_not_integral
+/// @author Copyright(c) 2016 Francisco Jose Tapia (fjtapia@gmail.com )\n
+/// Distributed under the Boost Software License, Version 1.0.\n
+/// ( See accompanying file LICENSE_1_0.txt or copy at
+/// http://www.boost.org/LICENSE_1_0.txt )
+/// @version 0.1
+///
+//-----------------------------------------------------------------------------
+#ifndef __BOOST_SORT_COMMON_UTIL_TRAITS_HPP
+#define __BOOST_SORT_COMMON_UTIL_TRAITS_HPP
+
+#include <functional>
+#include <iterator>
+#include <type_traits>
+
+namespace boost
+{
+namespace sort
+{
+namespace common
+{
+namespace util
+{
+//----------------------------------------------------------------------------
+// USING SENTENCES
+//----------------------------------------------------------------------------
+using std::iterator_traits;
+
+//
+//---------------------------------------------------------------------------
+/// @class value_iter
+/// @brief From the iterator, obtain the type pointed by it
+/// @remarks The main utility of this, is simplify the default template
+/// parameter of comparison
+//---------------------------------------------------------------------------
+template<class iter_t>
+using value_iter = typename iterator_traits< iter_t >::value_type;
+//
+//---------------------------------------------------------------------------
+/// @class compare_iter
+/// @brief From the iterator, received as template parameter, obtain the type
+/// of the object pointed by the iterator, and with this define the
+/// std::less with this type obtained
+/// @remarks The main utility of this, is simplify the default template
+/// parameter of comparison
+//---------------------------------------------------------------------------
+template<class iter_t>
+using compare_iter = std::less< value_iter< iter_t > >;
+
+//
+//---------------------------------------------------------------------------
+/// @class enable_if_not_integral
+/// @brief This is a SFINAE class for to detect if the third parameter in the
+/// invocation of the parallel sorting algorithms is an integer
+/// representing the number of threads to use or is a comparison object
+/// @remarks
+//---------------------------------------------------------------------------
+template<class T>
+using enable_if_not_integral =
+ typename std::enable_if< !std::is_integral< T >::value >::type;
+//
+//---------------------------------------------------------------------------
+/// @class enable_if_integral
+/// @brief This is a SFINAE class for to detect if the third parameter in the
+/// invocation of the parallel sorting algorithms is an integer
+/// representing the number of threads to use or is a comparison object
+/// @remarks
+//---------------------------------------------------------------------------
+template<class T>
+using enable_if_integral =
+ typename std::enable_if< std::is_integral< T >::value >::type;
+
+//
+//---------------------------------------------------------------------------
+/// @class enable_if_string
+/// @brief This is a SFINAE class for to detect if the parameter is a
+/// std::string for to apply specialized parameters in the invocation
+/// of the block_indirect_sort algorithm
+/// @remarks
+//---------------------------------------------------------------------------
+template<class T>
+using enable_if_string =
+ typename std::enable_if< std::is_same< T, std::string >::value >::type;
+
+//
+//---------------------------------------------------------------------------
+/// @class enable_if_not_string
+/// @brief This is a SFINAE class for to detect if the parameter is a
+/// std::string for to apply specialized parameters in the invocation
+/// of the block_indirect_sort algorithm
+/// @remarks
+//---------------------------------------------------------------------------
+template<class T>
+using enable_if_not_string =
+ typename std::enable_if<! std::is_same< T, std::string >::value >::type;
+
+//
+//---------------------------------------------------------------------------
+/// @class constructor
+/// @brief create a functor with the constructor of a class for to be invoked
+/// from a bind or a lambda
+/// @remarks
+//---------------------------------------------------------------------------
+template<class T>
+struct constructor
+{
+ template<class ... Args>
+ void operator()(Args && ... args)
+ {
+ T(std::forward<Args> (args) ...);
+ };
+};
+//
+//****************************************************************************
+};// End namespace util
+};// End namespace common
+};// End namespace sort
+};// End namespace boost
+//****************************************************************************
+#endif