cc/surfaces/surface_id.h

   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 CC_SURFACES_SURFACE_ID_H_
   6 #define CC_SURFACES_SURFACE_ID_H_
   7
   8 #include "base/containers/hash_tables.h"
   9
  10 namespace cc {
  11
  12 struct SurfaceId {
  13   SurfaceId() : id(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
  33 }  // namespace cc
  34
  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_