1/*
2 * Copyright (C) 2010 Apple Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
23 * THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#ifndef Arguments_h
27#define Arguments_h
28
29#include "ArgumentDecoder.h"
30#include "ArgumentEncoder.h"
31
32namespace IPC {
33
34template<size_t index, typename... Elements>
35struct TupleCoder {
36    static void encode(ArgumentEncoder& encoder, const std::tuple<Elements...>& tuple)
37    {
38        encoder << std::get<sizeof...(Elements) - index>(tuple);
39        TupleCoder<index - 1, Elements...>::encode(encoder, tuple);
40    }
41
42    static bool decode(ArgumentDecoder& decoder, std::tuple<Elements...>& tuple)
43    {
44        if (!decoder.decode(std::get<sizeof...(Elements) - index>(tuple)))
45            return false;
46        return TupleCoder<index - 1, Elements...>::decode(decoder, tuple);
47    }
48};
49
50template<typename... Elements>
51struct TupleCoder<0, Elements...> {
52    static void encode(ArgumentEncoder&, const std::tuple<Elements...>&)
53    {
54    }
55
56    static bool decode(ArgumentDecoder&, std::tuple<Elements...>&)
57    {
58        return true;
59    }
60};
61
62template<typename... Elements> struct ArgumentCoder<std::tuple<Elements...>> {
63    static void encode(ArgumentEncoder& encoder, const std::tuple<Elements...>& tuple)
64    {
65        TupleCoder<sizeof...(Elements), Elements...>::encode(encoder, tuple);
66    }
67
68    static bool decode(ArgumentDecoder& decoder, std::tuple<Elements...>& tuple)
69    {
70        return TupleCoder<sizeof...(Elements), Elements...>::decode(decoder, tuple);
71    }
72};
73
74template<typename... Types>
75struct Arguments {
76    typedef std::tuple<typename std::decay<Types>::type...> ValueType;
77
78    Arguments(Types&&... values)
79        : arguments(std::forward<Types>(values)...)
80    {
81    }
82
83    void encode(ArgumentEncoder& encoder) const
84    {
85        ArgumentCoder<std::tuple<Types...>>::encode(encoder, arguments);
86    }
87
88    static bool decode(ArgumentDecoder& decoder, Arguments& result)
89    {
90        return ArgumentCoder<std::tuple<Types...>>::decode(decoder, result.arguments);
91    }
92
93    std::tuple<Types...> arguments;
94};
95
96} // namespace IPC
97
98#endif // Arguments_h
99