ceph/src/boost/libs/spirit/include/boost/spirit/home/support/detail/make_cons.hpp

   1 /*=============================================================================
   2   Copyright (c) 2001-2011 Joel de Guzman
   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_MAKE_CONS_OCTOBER_16_2008_1252PM
   9 #define BOOST_SPIRIT_MAKE_CONS_OCTOBER_16_2008_1252PM
  10
  11 #if defined(_MSC_VER)
  12 #pragma once
  13 #endif
  14
  15 #include <boost/spirit/include/phoenix_limits.hpp>      // needs to be included before proto
  16 #include <boost/proto/proto.hpp>
  17 #include <boost/mpl/eval_if.hpp>
  18 #include <boost/fusion/include/cons.hpp>
  19 #include <boost/type_traits/remove_const.hpp>
  20 #include <boost/type_traits/is_abstract.hpp>
  21 #include <boost/type_traits/is_function.hpp>
  22 #include <boost/type_traits/add_reference.hpp>
  23 #include <boost/utility/enable_if.hpp>
  24
  25 namespace boost { namespace spirit { namespace detail
  26 {
  27     template <typename T>
  28     struct as_meta_element
  29       : mpl::eval_if_c<is_abstract<T>::value || is_function<T>::value
  30           , add_reference<T>, remove_const<T> >
  31     {};
  32
  33     template <typename T>
  34     struct as_meta_element<T&> : as_meta_element<T>   // always store by value
  35     {};
  36
  37     template <typename T, int N>
  38     struct as_meta_element<T[N]>
  39     {
  40         typedef const T(&type)[N];
  41     };
  42
  43     namespace result_of
  44     {
  45         template <typename Car, typename Cdr = fusion::nil_>
  46         struct make_cons
  47         {
  48             typedef typename as_meta_element<Car>::type car_type;            typedef typename fusion::cons<car_type, Cdr> type;
  49         };
  50     }
  51
  52     template <typename Car, typename Cdr>
  53     fusion::cons<typename as_meta_element<Car>::type, Cdr>
  54     make_cons(Car const& car, Cdr const& cdr)
  55     {
  56         typedef typename as_meta_element<Car>::type car_type;
  57         typedef typename fusion::cons<car_type, Cdr> result;
  58         return result(car, cdr);
  59     }
  60
  61     template <typename Car>
  62     fusion::cons<typename as_meta_element<Car>::type>
  63     make_cons(Car const& car)
  64     {
  65         typedef typename as_meta_element<Car>::type car_type;
  66         typedef typename fusion::cons<car_type> result;
  67         return result(car);
  68     }
  69
  70 #if defined(__GNUC__) && (__GNUC__ == 4) && (__GNUC_MINOR__ == 0)
  71     // workaround for gcc-4.0 bug where illegal function types
  72     // can be formed (const is added to function type)
  73     // description: http://lists.boost.org/Archives/boost/2009/04/150743.php
  74     template <typename Car>
  75     fusion::cons<typename as_meta_element<Car>::type>
  76     make_cons(Car& car, typename enable_if<is_function<Car> >::type* = 0)
  77     {
  78         typedef typename as_meta_element<Car>::type car_type;
  79         typedef typename fusion::cons<car_type> result;
  80         return result(car);
  81     }
  82 #endif
  83 }}}
  84
  85 #endif