ceph/src/boost/libs/numeric/odeint/include/boost/numeric/odeint/algebra/detail/extract_value_type.hpp

   1 /*
   2  [auto_generated]
   3  boost/numeric/odeint/algebra/detail/extract_value_type.hpp
   4
   5  [begin_description]
   6  Extract true value type from complex types (eg. std::complex)
   7  [end_description]
   8
   9  Copyright 2013 Karsten Ahnert
  10  Copyright 2013 Mario Mulansky
  11
  12  Distributed under the Boost Software License, Version 1.0.
  13  (See accompanying file LICENSE_1_0.txt or
  14  copy at http://www.boost.org/LICENSE_1_0.txt)
  15  */
  16
  17 #ifndef BOOST_NUMERIC_ODEINT_ALGEBRA_DETAIL_EXTRACT_VALUE_TYPE_HPP_INCLUDED
  18 #define BOOST_NUMERIC_ODEINT_ALGEBRA_DETAIL_EXTRACT_VALUE_TYPE_HPP_INCLUDED
  19
  20 #include <boost/utility.hpp>
  21 #include <boost/mpl/has_xxx.hpp>
  22
  23 BOOST_MPL_HAS_XXX_TRAIT_DEF(value_type)
  24
  25 namespace boost {
  26 namespace numeric {
  27 namespace odeint {
  28 namespace detail {
  29
  30 template< typename S , typename Enabler = void >
  31 struct extract_value_type {};
  32
  33 // as long as value_types are defined we go down the value_type chain
  34 // e.g. returning S::value_type::value_type::value_type
  35
  36 template< typename S >
  37 struct extract_value_type<S , typename boost::disable_if< has_value_type<S> >::type >
  38 {
  39     // no value_type defined, return S
  40     typedef S type;
  41 };
  42
  43 template< typename S >
  44 struct extract_value_type< S , typename boost::enable_if< has_value_type<S> >::type >
  45 {
  46     // go down the value_type
  47     typedef typename extract_value_type< typename S::value_type >::type type;
  48 };
  49
  50 } } } }
  51
  52 #endif