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1 // Copyright 2014 The Chromium Authors. All rights reserved. | 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 | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef CC_SURFACES_SURFACE_ID_H_ | 5 #ifndef CC_SURFACES_SURFACE_ID_H_ |
6 #define CC_SURFACES_SURFACE_ID_H_ | 6 #define CC_SURFACES_SURFACE_ID_H_ |
7 | 7 |
8 #include "base/containers/hash_tables.h" | 8 #include "base/id_type.h" |
9 | 9 |
10 namespace cc { | 10 namespace cc { |
11 | 11 |
12 struct SurfaceId { | 12 class Surface; |
13 SurfaceId() : id(0) {} | 13 using SurfaceId = base::IdType<Surface, uint64_t, 0>; |
14 explicit SurfaceId(uint64_t id) : id(id) {} | |
15 | |
16 bool is_null() const { return id == 0; } | |
17 | |
18 uint64_t id; | |
19 }; | |
20 | |
21 inline bool operator==(const SurfaceId& a, const SurfaceId& b) { | |
22 return a.id == b.id; | |
23 } | |
24 | |
25 inline bool operator!=(const SurfaceId& a, const SurfaceId& b) { | |
26 return !(a == b); | |
27 } | |
28 | |
29 inline bool operator<(const SurfaceId& a, const SurfaceId& b) { | |
30 return a.id < b.id; | |
31 } | |
32 | 14 |
33 } // namespace cc | 15 } // namespace cc |
34 | 16 |
35 namespace BASE_HASH_NAMESPACE { | |
36 template <> | |
37 struct hash<cc::SurfaceId> { | |
38 size_t operator()(cc::SurfaceId key) const { | |
39 return hash<uint64_t>()(key.id); | |
40 } | |
41 }; | |
42 } // namespace BASE_HASH_NAMESPACE | |
43 | |
44 #endif // CC_SURFACES_SURFACE_ID_H_ | 17 #endif // CC_SURFACES_SURFACE_ID_H_ |
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