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Side by Side Diff: mojo/edk/system/unique_identifier.h

Issue 814543006: Move //mojo/{public, edk} underneath //third_party (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: Rebase Created 5 years, 11 months ago
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1 // Copyright 2014 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #ifndef MOJO_EDK_SYSTEM_UNIQUE_IDENTIFIER_H_
6 #define MOJO_EDK_SYSTEM_UNIQUE_IDENTIFIER_H_
7
8 #include <stdint.h>
9 #include <string.h>
10
11 #include <iosfwd>
12
13 #include "base/compiler_specific.h"
14 #include "base/containers/hash_tables.h"
15 #include "mojo/edk/system/system_impl_export.h"
16
17 namespace mojo {
18 namespace system {
19
20 class UniqueIdentifier;
21
22 } // namespace system
23 } // namespace mojo
24
25 namespace BASE_HASH_NAMESPACE {
26
27 // Declare this before |UniqueIdentifier|, so that it can be friended.
28 template <>
29 struct hash<mojo::system::UniqueIdentifier>;
30
31 } // BASE_HASH_NAMESPACE
32
33 namespace mojo {
34 namespace system {
35
36 // Declare this before |UniqueIdentifier|, so that it can be friended.
37 MOJO_SYSTEM_IMPL_EXPORT std::ostream& operator<<(
38 std::ostream& out,
39 const UniqueIdentifier& unique_identifier);
40
41 // |UniqueIdentifier| is a POD class whose value is used to uniquely identify
42 // things.
43 class MOJO_SYSTEM_IMPL_EXPORT UniqueIdentifier {
44 public:
45 // This generates a new identifier. Uniqueness is "guaranteed" (i.e.,
46 // probabilistically) for identifiers.
47 static UniqueIdentifier Generate();
48
49 bool operator==(const UniqueIdentifier& other) const {
50 return memcmp(data_, other.data_, sizeof(data_)) == 0;
51 }
52 bool operator!=(const UniqueIdentifier& other) const {
53 return !operator==(other);
54 }
55 bool operator<(const UniqueIdentifier& other) const {
56 return memcmp(data_, other.data_, sizeof(data_)) < 0;
57 }
58
59 private:
60 friend BASE_HASH_NAMESPACE::hash<mojo::system::UniqueIdentifier>;
61 friend std::ostream& operator<<(std::ostream&, const UniqueIdentifier&);
62
63 explicit UniqueIdentifier() {}
64
65 char data_[16];
66
67 // Copying and assignment allowed.
68 };
69 static_assert(sizeof(UniqueIdentifier) == 16,
70 "UniqueIdentifier has wrong size.");
71 // We want to be able to take any buffer and cast it to a |UniqueIdentifier|.
72 static_assert(ALIGNOF(UniqueIdentifier) == 1,
73 "UniqueIdentifier requires nontrivial alignment.");
74
75 } // namespace system
76 } // namespace mojo
77
78 namespace BASE_HASH_NAMESPACE {
79
80 template <>
81 struct hash<mojo::system::UniqueIdentifier> {
82 size_t operator()(mojo::system::UniqueIdentifier unique_identifier) const {
83 return base::HashInts64(
84 *reinterpret_cast<uint64_t*>(unique_identifier.data_),
85 *reinterpret_cast<uint64_t*>(unique_identifier.data_ +
86 sizeof(uint64_t)));
87 }
88 };
89
90 } // BASE_HASH_NAMESPACE
91
92 #endif // MOJO_EDK_SYSTEM_UNIQUE_IDENTIFIER_H_
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