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+/*
+ [auto_generated]
+ boost/numeric/odeint/algebra/detail/extract_value_type.hpp
+
+ [begin_description]
+ Extract true value type from complex types (eg. std::complex)
+ [end_description]
+
+ Copyright 2013 Karsten Ahnert
+ Copyright 2013 Mario Mulansky
+
+ Distributed under the Boost Software License, Version 1.0.
+ (See accompanying file LICENSE_1_0.txt or
+ copy at http://www.boost.org/LICENSE_1_0.txt)
+ */
+
+#ifndef BOOST_NUMERIC_ODEINT_ALGEBRA_DETAIL_EXTRACT_VALUE_TYPE_HPP_INCLUDED
+#define BOOST_NUMERIC_ODEINT_ALGEBRA_DETAIL_EXTRACT_VALUE_TYPE_HPP_INCLUDED
+
+#include <boost/utility.hpp>
+#include <boost/mpl/has_xxx.hpp>
+
+BOOST_MPL_HAS_XXX_TRAIT_DEF(value_type)
+
+namespace boost {
+namespace numeric {
+namespace odeint {
+namespace detail {
+
+template< typename S , typename Enabler = void >
+struct extract_value_type {};
+
+// as long as value_types are defined we go down the value_type chain
+// e.g. returning S::value_type::value_type::value_type
+
+template< typename S >
+struct extract_value_type<S , typename boost::disable_if< has_value_type<S> >::type >
+{
+    // no value_type defined, return S
+    typedef S type;
+};
+
+template< typename S >
+struct extract_value_type< S , typename boost::enable_if< has_value_type<S> >::type >
+{
+    // go down the value_type
+    typedef typename extract_value_type< typename S::value_type >::type type;
+};
+
+} } } }
+
+#endif