ceph/src/boost/libs/spirit/include/boost/spirit/home/support/lazy.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(BOOST_SPIRIT_LAZY_NOVEMBER_04_2008_1157AM)
   8 #define BOOST_SPIRIT_LAZY_NOVEMBER_04_2008_1157AM
   9
  10 #if defined(_MSC_VER)
  11 #pragma once
  12 #endif
  13
  14 #include <boost/spirit/include/phoenix_core.hpp>
  15 #include <boost/proto/proto.hpp>
  16 #include <boost/spirit/home/support/modify.hpp>
  17 #include <boost/spirit/home/support/detail/is_spirit_tag.hpp>
  18
  19 namespace boost { namespace spirit
  20 {
  21     template <typename Eval>
  22     typename proto::terminal<phoenix::actor<Eval> >::type
  23     lazy(phoenix::actor<Eval> const& f)
  24     {
  25         return proto::terminal<phoenix::actor<Eval> >::type::make(f);
  26     }
  27
  28     namespace tag
  29     {
  30         struct lazy_eval
  31         {
  32             BOOST_SPIRIT_IS_TAG()
  33         };
  34     }
  35
  36     template <typename Domain>
  37     struct is_modifier_directive<Domain, tag::lazy_eval>
  38       : mpl::true_ {};
  39 }}
  40
  41 #endif