ceph/src/boost/libs/variant/include/boost/variant/detail/over_sequence.hpp

   1 //-----------------------------------------------------------------------------
   2 // boost variant/detail/over_sequence.hpp header file
   3 // See http://www.boost.org for updates, documentation, and revision history.
   4 //-----------------------------------------------------------------------------
   5 //
   6 // Copyright (c) 2003
   7 // Eric Friedman
   8 //
   9 // Portions Copyright (C) 2002 David Abrahams
  10 //
  11 // Distributed under the Boost Software License, Version 1.0. (See
  12 // accompanying file LICENSE_1_0.txt or copy at
  13 // http://www.boost.org/LICENSE_1_0.txt)
  14
  15 #ifndef BOOST_VARIANT_DETAIL_OVER_SEQUENCE_HPP
  16 #define BOOST_VARIANT_DETAIL_OVER_SEQUENCE_HPP
  17
  18 #include <boost/mpl/aux_/config/ctps.hpp>
  19
  20
  21 namespace boost {
  22 namespace detail { namespace variant {
  23
  24 ///////////////////////////////////////////////////////////////////////////////
  25 // (detail) class over_sequence
  26 //
  27 // Wrapper used to indicate bounded types for variant are from type sequence.
  28 //
  29 template <typename Types>
  30 struct over_sequence
  31 {
  32     typedef Types type;
  33 };
  34
  35 ///////////////////////////////////////////////////////////////////////////////
  36 // (detail) metafunction is_over_sequence (modeled on code by David Abrahams)
  37 //
  38 // Indicates whether the specified type is of form over_sequence<...> or not.
  39 //
  40
  41
  42 template <typename T>
  43 struct is_over_sequence
  44     : mpl::false_
  45 {
  46 };
  47
  48 template <typename Types>
  49 struct is_over_sequence< over_sequence<Types> >
  50     : mpl::true_
  51 {
  52 };
  53
  54
  55 }} // namespace detail::variant
  56 } // namespace boost
  57
  58 #endif // BOOST_VARIANT_DETAIL_OVER_SEQUENCE_HPP