diff -r 666f914201fb -r 2fe1408b6811 epoc32/include/stdapis/boost/variant/detail/move.hpp --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/epoc32/include/stdapis/boost/variant/detail/move.hpp Tue Mar 16 16:12:26 2010 +0000 @@ -0,0 +1,166 @@ +//----------------------------------------------------------------------------- +// boost variant/detail/move.hpp header file +// See http://www.boost.org for updates, documentation, and revision history. +//----------------------------------------------------------------------------- +// +// Copyright (c) 2002-2003 Eric Friedman +// Copyright (c) 2002 by Andrei Alexandrescu +// +// Use, modification and distribution are subject to 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) +// +// This file derivative of MoJO. Much thanks to Andrei for his initial work. +// See for information on MOJO. +// Re-issued here under the Boost Software License, with permission of the original +// author (Andrei Alexandrescu). + + +#ifndef BOOST_VARIANT_DETAIL_MOVE_HPP +#define BOOST_VARIANT_DETAIL_MOVE_HPP + +#include // for iterator_traits +#include // for placement new + +#include "boost/config.hpp" +#include "boost/detail/workaround.hpp" +#include "boost/mpl/if.hpp" +#include "boost/type_traits/is_base_and_derived.hpp" + +namespace boost { +namespace detail { namespace variant { + +////////////////////////////////////////////////////////////////////////// +// forward declares +// +// NOTE: Incomplete until (if?) Boost.Move becomes part of Boost. +// +template class moveable; +template class move_source; +template class move_return; + +namespace detail { + +// (detail) moveable_tag +// +// Concrete type from which moveable derives. +// +// TODO: Move into moveable_fwd.hpp and define has_move_constructor. +// +template +struct moveable_tag +{ +}; + +} // namespace detail + +////////////////////////////////////////////////////////////////////////// +// function template move +// +// Takes a T& and returns, if T derives moveable, a move_source for +// the object; else, returns the T&. +// + +namespace detail { + +// (detail) class template move_type +// +// Metafunction that, given moveable T, provides move_source, else T&. +// +template +struct move_type +{ +public: // metafunction result + + typedef typename mpl::if_< + is_base_and_derived, T> + , move_source + , T& + >::type type; + +}; + +} // namespace detail + +template +inline + typename detail::move_type::type +move(T& source) +{ + typedef typename detail::move_type::type + move_t; + + return move_t(source); +} + +////////////////////////////////////////////////////////////////////////// +// class template return_t +// +// Metafunction that, given moveable T, provides move_return, else T. +// +template +struct return_t +{ +public: // metafunction result + + typedef typename mpl::if_< + is_base_and_derived, T> + , move_return + , T + >::type type; + +}; + +////////////////////////////////////////////////////////////////////////// +// function template move_swap +// +// Swaps using Koenig lookup but falls back to move-swap for primitive +// types and on non-conforming compilers. +// + +#if defined(BOOST_NO_ARGUMENT_DEPENDENT_LOOKUP) \ + || BOOST_WORKAROUND(__GNUC__, BOOST_TESTED_AT(2)) + +// [Indicate that move_swap by overload is disabled...] +#define BOOST_NO_MOVE_SWAP_BY_OVERLOAD + +// [...and provide straight swap-by-move implementation:] +template +inline void move_swap(T& lhs, T& rhs) +{ + T tmp( boost::detail::variant::move(lhs) ); + lhs = boost::detail::variant::move(rhs); + rhs = boost::detail::variant::move(tmp); +} + +#else// !workaround + +namespace detail { namespace move_swap { + +template +inline void swap(T& lhs, T& rhs) +{ + T tmp( boost::detail::variant::move(lhs) ); + lhs = boost::detail::variant::move(rhs); + rhs = boost::detail::variant::move(tmp); +} + +}} // namespace detail::move_swap + +template +inline void move_swap(T& lhs, T& rhs) +{ + using detail::move_swap::swap; + + swap(lhs, rhs); +} + +#endif // workaround + +}} // namespace detail::variant +} // namespace boost + +#endif // BOOST_VARIANT_DETAIL_MOVE_HPP + + +