// boost lockfree: copy_payload helper // // 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_DETAIL_COPY_PAYLOAD_HPP_INCLUDED #define BOOST_LOCKFREE_DETAIL_COPY_PAYLOAD_HPP_INCLUDED #include <boost/mpl/if.hpp> #include <boost/type_traits/is_convertible.hpp> namespace boost { namespace lockfree { namespace detail { struct copy_convertible { template <typename T, typename U> static void copy(T & t, U & u) { u = t; } }; struct copy_constructible_and_copyable { template <typename T, typename U> static void copy(T & t, U & u) { u = U(t); } }; template <typename T, typename U> void copy_payload(T & t, U & u) { typedef typename boost::mpl::if_<typename boost::is_convertible<T, U>::type, copy_convertible, copy_constructible_and_copyable >::type copy_type; copy_type::copy(t, u); } template <typename T> struct consume_via_copy { consume_via_copy(T & out): out_(out) {} template <typename U> void operator()(U & element) { copy_payload(element, out_); } T & out_; }; }}} #endif /* BOOST_LOCKFREE_DETAIL_COPY_PAYLOAD_HPP_INCLUDED */