base/trace_event/memory_allocator_dump_guid.h

   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 <string>
   9
  10 #include "base/base_export.h"
  11 #include "base/basictypes.h"
  12
  13 namespace base {
  14 namespace trace_event {
  15
  16 class BASE_EXPORT MemoryAllocatorDumpGuid {
  17  public:
  18   MemoryAllocatorDumpGuid();
  19   explicit MemoryAllocatorDumpGuid(uint64 guid);
  20
  21   // Utility ctor to hash a GUID if the caller prefers a string. The caller
  22   // still has to ensure that |guid_str| is unique, per snapshot, within the
  23   // global scope of all the traced processes.
  24   explicit MemoryAllocatorDumpGuid(const std::string& guid_str);
  25
  26   uint64 ToUint64() const { return guid_; }
  27
  28   // Returns a (hex-encoded) string representation of the guid.
  29   std::string ToString() const;
  30
  31   bool empty() const { return guid_ == 0u; }
  32
  33   bool operator==(const MemoryAllocatorDumpGuid& other) const {
  34     return guid_ == other.guid_;
  35   }
  36
  37   bool operator!=(const MemoryAllocatorDumpGuid& other) const {
  38     return !(*this == other);
  39   }
  40
  41  private:
  42   uint64 guid_;
  43
  44   // Deliberately copy-able.
  45 };
  46
  47 }  // namespace trace_event
  48 }  // namespace base
  49
  50 #endif  // BASE_TRACE_EVENT_MEMORY_ALLOCATOR_DUMP_GUID_H_