boost/lockfree/policies.hpp
// boost lockfree // // Copyright (C) 2011 Tim Blechmann // // Distributed under the Boost Software License, Version 1.0. (See // accompanying file LICENSE_1_0.txt or copy at // http://www.boost.org/LICENSE_1_0.txt) #ifndef BOOST_LOCKFREE_POLICIES_HPP_INCLUDED #define BOOST_LOCKFREE_POLICIES_HPP_INCLUDED #include <boost/parameter/template_keyword.hpp> #include <type_traits> namespace boost { namespace lockfree { #ifndef BOOST_DOXYGEN_INVOKED namespace tag { struct allocator; struct fixed_sized; struct capacity; } // namespace tag /** Configures a data structure as \b fixed-sized. * * The internal nodes are stored inside an array and they are addressed by array indexing. This limits the possible * size of the queue to the number of elements that can be addressed by the index type (usually 2**16-2), but on * platforms that lack double-width compare-and-exchange instructions, this is the best way to achieve lock-freedom. * This implies that a data structure is bounded. * */ template < bool IsFixedSized > struct fixed_sized : boost::parameter::template_keyword< tag::fixed_sized, std::integral_constant< bool, IsFixedSized > > {}; /** Sets the \b capacity of a data structure at compile-time. * * This implies that a data structure is bounded and fixed-sized. * */ template < size_t Size > struct capacity : boost::parameter::template_keyword< tag::capacity, std::integral_constant< size_t, Size > > {}; /** Defines the \b allocator type of a data structure. * */ template < class Alloc > struct allocator : boost::parameter::template_keyword< tag::allocator, Alloc > {}; #else /** Configures a data structure as \b fixed-sized. * * The internal nodes are stored inside an array and they are addressed by array indexing. This limits the possible * size of the queue to the number of elements that can be addressed by the index type (usually 2**16-2), but on * platforms that lack double-width compare-and-exchange instructions, this is the best way to achieve lock-freedom. * This implies that a data structure is bounded. * */ template < bool IsFixedSized > struct fixed_sized; /** Sets the \b capacity of a data structure at compile-time. * * This implies that a data structure is bounded and fixed-sized. * */ template < size_t Size > struct capacity; /** Defines the \b allocator type of a data structure. * */ template < class Alloc > struct allocator; #endif }} // namespace boost::lockfree #endif /* BOOST_LOCKFREE_POLICIES_HPP_INCLUDED */