84 lines
1.8 KiB
C++
84 lines
1.8 KiB
C++
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// boost lockfree: copy_payload helper
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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_COPY_PAYLOAD_HPP_INCLUDED
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#define BOOST_LOCKFREE_DETAIL_COPY_PAYLOAD_HPP_INCLUDED
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#include <boost/mpl/if.hpp>
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#include <boost/type_traits/is_convertible.hpp>
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#if defined(_MSC_VER)
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#pragma warning(push)
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#pragma warning(disable: 4512) // assignment operator could not be generated
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#endif
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namespace boost {
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namespace lockfree {
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namespace detail {
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struct copy_convertible
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{
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template <typename T, typename U>
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static void copy(T & t, U & u)
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{
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u = t;
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}
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};
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struct copy_constructible_and_copyable
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{
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template <typename T, typename U>
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static void copy(T & t, U & u)
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{
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u = U(t);
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}
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};
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template <typename T, typename U>
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void copy_payload(T & t, U & u)
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{
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typedef typename boost::mpl::if_<typename boost::is_convertible<T, U>::type,
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copy_convertible,
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copy_constructible_and_copyable
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>::type copy_type;
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copy_type::copy(t, u);
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}
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template <typename T>
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struct consume_via_copy
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{
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consume_via_copy(T & out):
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out_(out)
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{}
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template <typename U>
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void operator()(U & element)
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{
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copy_payload(element, out_);
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}
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T & out_;
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};
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struct consume_noop
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{
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template <typename U>
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void operator()(const U &)
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{
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}
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};
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}}}
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#if defined(_MSC_VER)
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#pragma warning(pop)
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#endif
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#endif /* BOOST_LOCKFREE_DETAIL_COPY_PAYLOAD_HPP_INCLUDED */
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