79 lines
2.3 KiB
C++
79 lines
2.3 KiB
C++
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// boost lockfree
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//
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// Copyright (C) 2011, 2016 Tim Blechmann
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//
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// Distributed under the Boost Software License, Version 1.0. (See
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// accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_LOCKFREE_DETAIL_PARAMETER_HPP
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#define BOOST_LOCKFREE_DETAIL_PARAMETER_HPP
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#include <boost/lockfree/policies.hpp>
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#include <boost/parameter/parameters.hpp>
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#include <boost/parameter/binding.hpp>
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#include <boost/mpl/void.hpp>
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namespace boost {
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namespace lockfree {
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namespace detail {
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namespace mpl = boost::mpl;
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template <typename bound_args, typename tag_type>
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struct has_arg
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{
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typedef typename parameter::binding<bound_args, tag_type, mpl::void_>::type type;
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static const bool value = mpl::is_not_void_<type>::type::value;
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};
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template <typename bound_args>
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struct extract_capacity
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{
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static const bool has_capacity = has_arg<bound_args, tag::capacity>::value;
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typedef typename mpl::if_c<has_capacity,
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typename has_arg<bound_args, tag::capacity>::type,
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mpl::size_t< 0 >
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>::type capacity_t;
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static const std::size_t capacity = capacity_t::value;
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};
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template <typename bound_args, typename T>
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struct extract_allocator
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{
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static const bool has_allocator = has_arg<bound_args, tag::allocator>::value;
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typedef typename mpl::if_c<has_allocator,
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typename has_arg<bound_args, tag::allocator>::type,
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std::allocator<T>
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>::type allocator_arg;
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typedef typename allocator_arg::template rebind<T>::other type;
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};
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template <typename bound_args, bool default_ = false>
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struct extract_fixed_sized
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{
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static const bool has_fixed_sized = has_arg<bound_args, tag::fixed_sized>::value;
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typedef typename mpl::if_c<has_fixed_sized,
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typename has_arg<bound_args, tag::fixed_sized>::type,
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mpl::bool_<default_>
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>::type type;
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static const bool value = type::value;
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};
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} /* namespace detail */
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} /* namespace lockfree */
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} /* namespace boost */
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#endif /* BOOST_LOCKFREE_DETAIL_PARAMETER_HPP */
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