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1 | // boost lockfree: copy_payload helper |
2 | // | |
3 | // Copyright (C) 2011, 2016 Tim Blechmann | |
4 | // | |
5 | // Distributed under the Boost Software License, Version 1.0. (See | |
6 | // accompanying file LICENSE_1_0.txt or copy at | |
7 | // http://www.boost.org/LICENSE_1_0.txt) | |
8 | ||
9 | #ifndef BOOST_LOCKFREE_DETAIL_COPY_PAYLOAD_HPP_INCLUDED | |
10 | #define BOOST_LOCKFREE_DETAIL_COPY_PAYLOAD_HPP_INCLUDED | |
11 | ||
12 | #include <boost/mpl/if.hpp> | |
13 | #include <boost/type_traits/is_convertible.hpp> | |
14 | ||
15 | #if defined(_MSC_VER) | |
16 | #pragma warning(push) | |
17 | #pragma warning(disable: 4512) // assignment operator could not be generated | |
18 | #endif | |
19 | ||
20 | namespace boost { | |
21 | namespace lockfree { | |
22 | namespace detail { | |
23 | ||
24 | struct copy_convertible | |
25 | { | |
26 | template <typename T, typename U> | |
27 | static void copy(T & t, U & u) | |
28 | { | |
29 | u = t; | |
30 | } | |
31 | }; | |
32 | ||
33 | struct copy_constructible_and_copyable | |
34 | { | |
35 | template <typename T, typename U> | |
36 | static void copy(T & t, U & u) | |
37 | { | |
38 | u = U(t); | |
39 | } | |
40 | }; | |
41 | ||
42 | template <typename T, typename U> | |
43 | void copy_payload(T & t, U & u) | |
44 | { | |
45 | typedef typename boost::mpl::if_<typename boost::is_convertible<T, U>::type, | |
46 | copy_convertible, | |
47 | copy_constructible_and_copyable | |
48 | >::type copy_type; | |
49 | copy_type::copy(t, u); | |
50 | } | |
51 | ||
52 | template <typename T> | |
53 | struct consume_via_copy | |
54 | { | |
55 | consume_via_copy(T & out): | |
56 | out_(out) | |
57 | {} | |
58 | ||
59 | template <typename U> | |
60 | void operator()(U & element) | |
61 | { | |
62 | copy_payload(element, out_); | |
63 | } | |
64 | ||
65 | T & out_; | |
66 | }; | |
67 | ||
68 | struct consume_noop | |
69 | { | |
70 | template <typename U> | |
71 | void operator()(const U &) | |
72 | { | |
73 | } | |
74 | }; | |
75 | ||
76 | ||
77 | }}} | |
78 | ||
79 | #if defined(_MSC_VER) | |
80 | #pragma warning(pop) | |
81 | #endif | |
82 | ||
83 | #endif /* BOOST_LOCKFREE_DETAIL_COPY_PAYLOAD_HPP_INCLUDED */ |