ceph/src/boost/boost/parameter/aux_/pack/tag_keyword_arg_ref.hpp

   1 // Copyright David Abrahams, Daniel Wallin 2003.
   2 // Distributed under the Boost Software License, Version 1.0.
   3 // (See accompanying file LICENSE_1_0.txt or copy at
   4 // http://www.boost.org/LICENSE_1_0.txt)
   5
   6 #ifndef BOOST_PARAMETER_AUX_PACK_TAG_KEYWORD_ARG_REF_HPP
   7 #define BOOST_PARAMETER_AUX_PACK_TAG_KEYWORD_ARG_REF_HPP
   8
   9 #include <boost/parameter/aux_/unwrap_cv_reference.hpp>
  10 #include <boost/parameter/aux_/tagged_argument.hpp>
  11 #include <boost/parameter/config.hpp>
  12
  13 namespace boost { namespace parameter { namespace aux {
  14
  15     template <
  16         typename Keyword
  17       , typename ActualArg
  18 #if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x564))
  19       , typename = typename ::boost::parameter::aux
  20         ::is_cv_reference_wrapper<ActualArg>::type
  21 #endif
  22     >
  23     struct tag_ref
  24     {
  25         typedef ::boost::parameter::aux::tagged_argument<
  26             Keyword
  27           , typename ::boost::parameter::aux
  28             ::unwrap_cv_reference<ActualArg>::type
  29         > type;
  30     };
  31 }}} // namespace boost::parameter::aux_
  32
  33 #if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x564))
  34
  35 #include <boost/mpl/bool.hpp>
  36
  37 namespace boost { namespace parameter { namespace aux {
  38
  39     template <typename Keyword, typename ActualArg>
  40     struct tag_ref<Keyword,ActualArg,::boost::mpl::false_>
  41     {
  42         typedef ::boost::parameter::aux
  43         ::tagged_argument<Keyword,ActualArg> type;
  44     };
  45 }}} // namespace boost::parameter::aux_
  46
  47 #endif  // Borland workarounds needed.
  48
  49 namespace boost { namespace parameter { namespace aux {
  50
  51     struct tag_keyword_arg_ref
  52     {
  53         template <typename K, typename T>
  54         struct apply
  55         {
  56             typedef typename ::boost::parameter::aux::tag_ref<K,T>::type type;
  57         };
  58
  59 #if defined(BOOST_PARAMETER_CAN_USE_MP11)
  60         template <typename K, typename T>
  61         using fn = typename ::boost::parameter::aux::tag_ref<K,T>::type;
  62 #endif
  63     };
  64 }}} // namespace boost::parameter::aux
  65
  66 #endif  // include guard
  67