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/compiler_specific.h" 9 #include "base/containers/hash_tables.h" 10 11 namespace cc { 12 13 struct SurfaceId { 14 SurfaceId() : id(0) {} 15 explicit SurfaceId(uint64_t id) : id(id) {} 16 17 bool is_null() const { return id == 0; } 18 19 uint64_t id; 20 }; 21 22 inline bool operator==(const SurfaceId& a, const SurfaceId& b) { 23 return a.id == b.id; 24 } 25 26 inline bool operator!=(const SurfaceId& a, const SurfaceId& b) { 27 return !(a == b); 28 } 29 30 inline bool operator<(const SurfaceId& a, const SurfaceId& b) { 31 return a.id < b.id; 32 } 33 34 } // namespace cc 35 36 namespace BASE_HASH_NAMESPACE { 37 #if defined(COMPILER_MSVC) 38 inline size_t hash_value(const cc::SurfaceId& key) { 39 return hash_value(key.id); 40 } 41 #elif defined(COMPILER_GCC) 42 template <> 43 struct hash<cc::SurfaceId> { 44 size_t operator()(cc::SurfaceId key) const { 45 return hash<uint64_t>()(key.id); 46 } 47 }; 48 #else 49 #error define a hash function for your compiler 50 #endif // COMPILER 51 } // namespace BASE_HASH_NAMESPACE 52 53 #endif // CC_SURFACES_SURFACE_ID_H_ 54
