ceph/src/boost/libs/spirit/include/boost/spirit/home/classic/actor/clear_actor.hpp

   1 /*=============================================================================
   2     Copyright (c) 2003 Jonathan de Halleux (dehalleux@pelikhan.com)
   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 #ifndef BOOST_SPIRIT_ACTOR_CLEAR_ACTOR_HPP
   9 #define BOOST_SPIRIT_ACTOR_CLEAR_ACTOR_HPP
  10
  11 #include <boost/spirit/home/classic/namespace.hpp>
  12 #include <boost/spirit/home/classic/actor/ref_actor.hpp>
  13
  14 namespace boost { namespace spirit {
  15
  16 BOOST_SPIRIT_CLASSIC_NAMESPACE_BEGIN
  17
  18     ///////////////////////////////////////////////////////////////////////////
  19     //  Summary:
  20     //  A semantic action policy that calls clear method.
  21     //  (This doc uses convention available in actors.hpp)
  22     //
  23     //  Actions (what it does):
  24     //      ref.clear();
  25     //
  26     //  Policy name:
  27     //      clear_action
  28     //
  29     //  Policy holder, corresponding helper method:
  30     //      ref_actor, clear_a( ref );
  31     //
  32     //  () operators: both.
  33     //
  34     //  See also ref_actor for more details.
  35     ///////////////////////////////////////////////////////////////////////////
  36     struct clear_action
  37     {
  38         template<
  39             typename T
  40         >
  41         void act(T& ref_) const
  42         {
  43             ref_.clear();
  44         }
  45     };
  46
  47     ///////////////////////////////////////////////////////////////////////////
  48     // helper method that creates a and_assign_actor.
  49     ///////////////////////////////////////////////////////////////////////////
  50     template<typename T>
  51     inline ref_actor<T,clear_action> clear_a(T& ref_)
  52     {
  53         return ref_actor<T,clear_action>(ref_);
  54     }
  55
  56 BOOST_SPIRIT_CLASSIC_NAMESPACE_END
  57
  58 }}
  59
  60 #endif
  61