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Side by Side Diff: cc/surfaces/surface_id.h

Issue 1496103002: Reusing base::IdType<...> to implement SurfaceId. Base URL: https://chromium.googlesource.com/chromium/src.git@type-safe-id-base
Patch Set: Created 5 years ago
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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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