external_libraries/boost-lockfree/boost/lockfree/detail/parameter.hpp

   1 // boost lockfree
   2 //
   3 // Copyright (C) 2011 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/integer_traits.hpp>
  14
  15 namespace boost {
  16 namespace lockfree {
  17 namespace detail {
  18
  19 namespace mpl = boost::mpl;
  20
  21 template <typename bound_args, typename tag_type>
  22 struct has_arg
  23 {
  24     typedef typename parameter::binding<bound_args, tag_type, mpl::void_>::type type;
  25     static const bool value = mpl::is_not_void_<type>::type::value;
  26 };
  27
  28
  29 template <typename bound_args>
  30 struct extract_capacity
  31 {
  32     static const bool has_capacity = has_arg<bound_args, tag::capacity>::value;
  33
  34     typedef typename mpl::if_c<has_capacity,
  35                                typename has_arg<bound_args, tag::capacity>::type,
  36                                mpl::size_t< boost::integer_traits<size_t>::const_max >
  37                               >::type capacity_t;
  38
  39     static const std::size_t capacity = capacity_t::value;
  40 };
  41
  42
  43 template <typename bound_args, typename T>
  44 struct extract_allocator
  45 {
  46     static const bool has_allocator = has_arg<bound_args, tag::allocator>::value;
  47
  48     typedef typename mpl::if_c<has_allocator,
  49                                typename has_arg<bound_args, tag::allocator>::type,
  50                                std::allocator<T>
  51                               >::type allocator_arg;
  52
  53     typedef typename allocator_arg::template rebind<T>::other type;
  54 };
  55
  56 template <typename bound_args, bool default_ = false>
  57 struct extract_fixed_sized
  58 {
  59     static const bool has_fixed_sized = has_arg<bound_args, tag::fixed_sized>::value;
  60
  61     typedef typename mpl::if_c<has_fixed_sized,
  62                                typename has_arg<bound_args, tag::fixed_sized>::type,
  63                                mpl::bool_<default_>
  64                               >::type type;
  65
  66     static const bool value = type::value;
  67 };
  68
  69
  70 } /* namespace detail */
  71 } /* namespace lockfree */
  72 } /* namespace boost */
  73
  74 #endif /* BOOST_LOCKFREE_DETAIL_PARAMETER_HPP */