ceph/src/boost/libs/lockfree/include/boost/lockfree/detail/parameter.hpp

   1 // boost lockfree
   2 //
   3 // Copyright (C) 2011, 2016 Tim Blechmann
   4 //
   5 // Distributed under the Boost Software License, Version 1.0. (See
   6 // accompanying file LICENSE_1_0.txt or copy at
   7 // http://www.boost.org/LICENSE_1_0.txt)
   8
   9 #ifndef BOOST_LOCKFREE_DETAIL_PARAMETER_HPP
  10 #define BOOST_LOCKFREE_DETAIL_PARAMETER_HPP
  11
  12 #include <boost/lockfree/policies.hpp>
  13 #include <boost/parameter/parameters.hpp>
  14 #include <boost/parameter/binding.hpp>
  15
  16 #include <boost/mpl/void.hpp>
  17
  18
  19 namespace boost {
  20 namespace lockfree {
  21 namespace detail {
  22
  23 namespace mpl = boost::mpl;
  24
  25 template <typename bound_args, typename tag_type>
  26 struct has_arg
  27 {
  28     typedef typename parameter::binding<bound_args, tag_type, mpl::void_>::type type;
  29     static const bool value = mpl::is_not_void_<type>::type::value;
  30 };
  31
  32
  33 template <typename bound_args>
  34 struct extract_capacity
  35 {
  36     static const bool has_capacity = has_arg<bound_args, tag::capacity>::value;
  37
  38     typedef typename mpl::if_c<has_capacity,
  39                                typename has_arg<bound_args, tag::capacity>::type,
  40                                mpl::size_t< 0 >
  41                               >::type capacity_t;
  42
  43     static const std::size_t capacity = capacity_t::value;
  44 };
  45
  46
  47 template <typename bound_args, typename T>
  48 struct extract_allocator
  49 {
  50     static const bool has_allocator = has_arg<bound_args, tag::allocator>::value;
  51
  52     typedef typename mpl::if_c<has_allocator,
  53                                typename has_arg<bound_args, tag::allocator>::type,
  54                                std::allocator<T>
  55                               >::type allocator_arg;
  56
  57     typedef typename allocator_arg::template rebind<T>::other type;
  58 };
  59
  60 template <typename bound_args, bool default_ = false>
  61 struct extract_fixed_sized
  62 {
  63     static const bool has_fixed_sized = has_arg<bound_args, tag::fixed_sized>::value;
  64
  65     typedef typename mpl::if_c<has_fixed_sized,
  66                                typename has_arg<bound_args, tag::fixed_sized>::type,
  67                                mpl::bool_<default_>
  68                               >::type type;
  69
  70     static const bool value = type::value;
  71 };
  72
  73
  74 } /* namespace detail */
  75 } /* namespace lockfree */
  76 } /* namespace boost */
  77
  78 #endif /* BOOST_LOCKFREE_DETAIL_PARAMETER_HPP */