ceph/src/boost/libs/spirit/include/boost/spirit/home/x3/support/traits/attribute_type.hpp

   1 /*=============================================================================
   2     Copyright (c) 2001-2014 Joel de Guzman
   3     http://spirit.sourceforge.net/
   4
   5     Distributed under the Boost Software License, Version 1.0. (See accompanying
   6     file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   7 =============================================================================*/
   8 #if !defined(BOOST_SPIRIT_X3_ATTRIBUTE_TYPE_JAN_5_2012_0358PM)
   9 #define BOOST_SPIRIT_X3_ATTRIBUTE_TYPE_JAN_5_2012_0358PM
  10
  11 #include <boost/mpl/identity.hpp>
  12
  13 namespace boost { namespace spirit { namespace x3 { namespace traits
  14 {
  15     ///////////////////////////////////////////////////////////////////////////
  16     // Retrieve the attribute type to use from the given type
  17     //
  18     // This is needed to extract the correct attribute type from proxy classes
  19     // as utilized in FUSION_ADAPT_ADT et. al.
  20     ///////////////////////////////////////////////////////////////////////////
  21     template <typename Attribute, typename Enable = void>
  22     struct attribute_type : mpl::identity<Attribute> {};
  23
  24 }}}}
  25
  26 #endif