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Serenity Operating System
1/*
2 * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright notice, this
9 * list of conditions and the following disclaimer.
10 *
11 * 2. Redistributions in binary form must reproduce the above copyright notice,
12 * this list of conditions and the following disclaimer in the documentation
13 * and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
16 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
18 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
21 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
22 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
23 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#pragma once
28
29#include <AK/Platform.h>
30
31namespace AK {
32
33template <typename T, auto NoErrorValue>
34class CONSUMABLE(unknown) Error {
35public:
36 RETURN_TYPESTATE(unknown)
37 Error()
38 : t(NoErrorValue)
39 {}
40
41 RETURN_TYPESTATE(unknown)
42 Error(T t)
43 : t(t)
44 {}
45
46 RETURN_TYPESTATE(unknown)
47 Error(Error&& other)
48 : t(move(other.t))
49 {
50 }
51
52 RETURN_TYPESTATE(unknown)
53 Error(const Error& other)
54 : t(other.t)
55 {
56 }
57
58 CALLABLE_WHEN("unknown", "consumed")
59 ~Error() {}
60
61 SET_TYPESTATE(consumed)
62 bool failed() const {
63 return t != NoErrorValue;
64 }
65
66 [[deprecated]]
67 SET_TYPESTATE(consumed)
68 void ignore() {}
69
70 const T& value() const { return t; }
71
72 bool operator==(const Error& o) { return t == o.t; }
73 bool operator!=(const Error& o) { return t != o.t; }
74 T t;
75};
76
77}
78
79using AK::Error;