// Copyright (C) 2007 Matthias Troyer//// Use, modification and distribution is subject to the Boost Software// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at//// This file contains helper data structures for use in transmitting// properties. The basic idea is to optimize away any storage for the// properties when no properties are specified.// File moved#include <boost/property_map/parallel/detail/untracked_pair.hpp>