ceph/src/boost/boost/spirit/home/x3/support/traits/pseudo_attribute.hpp

   1 /*=============================================================================
   2     Copyright (c) 2019 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_X3_PSEUDO_ATTRIBUTE_OF_MAY_15_2019_1012PM)
   8 #define BOOST_SPIRIT_X3_PSEUDO_ATTRIBUTE_OF_MAY_15_2019_1012PM
   9
  10 #include <utility>
  11
  12 namespace boost { namespace spirit { namespace x3 { namespace traits
  13 {
  14     ///////////////////////////////////////////////////////////////////////////
  15     // Pseudo attributes are placeholders for parsers that can only know
  16     // its actual attribute at parse time. This trait customization point
  17     // provides a mechanism to convert the trait to the actual trait at
  18     // parse time.
  19     ///////////////////////////////////////////////////////////////////////////
  20     template <typename Context, typename Attribute, typename Iterator
  21       , typename Enable = void>
  22     struct pseudo_attribute
  23     {
  24         using attribute_type = Attribute;
  25         using type = Attribute;
  26
  27         static type&& call(Iterator&, Iterator const&, attribute_type&& attr)
  28         {
  29             return std::forward<type>(attr);
  30         }
  31     };
  32 }}}}
  33
  34 #endif