ceph/src/boost/libs/spirit/include/boost/spirit/home/support/sequence_base_id.hpp

   1 /*=============================================================================
   2     Copyright (c) 2001-2011 Joel de Guzman
   3
   4     Distributed under the Boost Software License, Version 1.0. (See accompanying
   5     file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   6 =============================================================================*/
   7 #if !defined(SPIRIT_SEQUENCE_BASE_ID_MAR_15_2009_1243PM)
   8 #define SPIRIT_SEQUENCE_BASE_ID_MAR_15_2009_1243PM
   9
  10 #if defined(_MSC_VER)
  11 #pragma once
  12 #endif
  13
  14 #include <boost/mpl/has_xxx.hpp>
  15 #include <boost/utility/enable_if.hpp>
  16 #include <boost/spirit/home/support/attributes.hpp>
  17
  18 namespace boost { namespace spirit { namespace traits
  19 {
  20     namespace detail
  21     {
  22         BOOST_MPL_HAS_XXX_TRAIT_DEF(sequence_base_id)
  23     }
  24
  25     // We specialize this for sequences (see support/attributes.hpp).
  26     // For sequences, we only wrap the attribute in a tuple IFF
  27     // it is not already a fusion tuple.
  28     //
  29     // Note: in the comment above, "sequence" is a spirit sequence
  30     // component (parser or generator), and a tuple is a fusion sequence
  31     // (to avoid terminology confusion).
  32     template <typename Derived, typename Attribute>
  33     struct pass_attribute<Derived, Attribute,
  34         typename enable_if<detail::has_sequence_base_id<Derived> >::type>
  35       : wrap_if_not_tuple<Attribute> {};
  36
  37 }}}
  38
  39 #endif