ceph/src/boost/boost/spirit/home/support/multi_pass_wrapper.hpp

   1 //  Copyright (c) 2001-2011 Hartmut Kaiser
   2 //
   3 //  Distributed under the Boost Software License, Version 1.0. (See accompanying
   4 //  file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   5
   6 #if !defined(BOOST_SPIRIT_ITERATOR_MULTI_PASS_WRAPPER_JUL_12_2009_0914PM)
   7 #define BOOST_SPIRIT_ITERATOR_MULTI_PASS_WRAPPER_JUL_12_2009_0914PM
   8
   9 #if defined(_MSC_VER)
  10 #pragma once
  11 #endif
  12
  13 #include <boost/mpl/bool.hpp>
  14 #include <boost/spirit/home/support/detail/scoped_enum_emulation.hpp>
  15
  16 namespace boost { namespace spirit { namespace traits
  17 {
  18     // declare special functions allowing to integrate any multi_pass iterator
  19     // with expectation points
  20
  21     // normal iterators require no special handling
  22     BOOST_SCOPED_ENUM_START(clear_mode)
  23     {
  24         clear_if_enabled,
  25         clear_always
  26     };
  27     BOOST_SCOPED_ENUM_END
  28
  29     template <typename Iterator>
  30     void clear_queue(Iterator&
  31       , BOOST_SCOPED_ENUM(clear_mode) /*mode*/ = clear_mode::clear_if_enabled)
  32     {}
  33
  34     template <typename Iterator>
  35     void inhibit_clear_queue(Iterator&, bool)
  36     {}
  37
  38     template <typename Iterator>
  39     bool inhibit_clear_queue(Iterator&)
  40     {
  41         return false;
  42     }
  43
  44     // Helper template to recognize a multi_pass iterator. This specialization
  45     // will be instantiated for any non-multi_pass iterator.
  46     template <typename Iterator>
  47     struct is_multi_pass : mpl::false_ {};
  48
  49 }}}
  50
  51 #endif
  52