1 // Copyright 2015 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 BASE_TRACE_EVENT_MEMORY_ALLOCATOR_DUMP_GUID_H_
6 #define BASE_TRACE_EVENT_MEMORY_ALLOCATOR_DUMP_GUID_H_
7 
8 #include <stdint.h>
9 
10 #include <string>
11 
12 #include "base/base_export.h"
13 
14 namespace base {
15 namespace trace_event {
16 
17 class BASE_EXPORT MemoryAllocatorDumpGuid {
18  public:
19   MemoryAllocatorDumpGuid();
20   explicit MemoryAllocatorDumpGuid(uint64_t guid);
21 
22   // Utility ctor to hash a GUID if the caller prefers a string. The caller
23   // still has to ensure that |guid_str| is unique, per snapshot, within the
24   // global scope of all the traced processes.
25   explicit MemoryAllocatorDumpGuid(const std::string& guid_str);
26 
ToUint64()27   uint64_t ToUint64() const { return guid_; }
28 
29   // Returns a (hex-encoded) string representation of the guid.
30   std::string ToString() const;
31 
empty()32   bool empty() const { return guid_ == 0u; }
33 
34   bool operator==(const MemoryAllocatorDumpGuid& other) const {
35     return guid_ == other.guid_;
36   }
37 
38   bool operator!=(const MemoryAllocatorDumpGuid& other) const {
39     return !(*this == other);
40   }
41 
42  private:
43   uint64_t guid_;
44 
45   // Deliberately copy-able.
46 };
47 
48 }  // namespace trace_event
49 }  // namespace base
50 
51 #endif  // BASE_TRACE_EVENT_MEMORY_ALLOCATOR_DUMP_GUID_H_
52