chromium/ui/gfx/generic_shared_memory_id.h

// Copyright 2015 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef UI_GFX_GENERIC_SHARED_MEMORY_ID_H_
#define UI_GFX_GENERIC_SHARED_MEMORY_ID_H_

#include <stddef.h>
#include <stdint.h>

#include <functional>

#include "base/hash/hash.h"
#include "base/trace_event/memory_allocator_dump.h"
#include "ui/gfx/gfx_export.h"

namespace gfx {

// Defines an ID type which is used across all types of shared memory
// allocations in content/. This ID type is in ui/gfx, as components outside
// content/ may need to hold an ID (but should not generate one).
class GFX_EXPORT GenericSharedMemoryId { … };

// Generates GUID which can be used to trace shared memory using its
// GenericSharedMemoryId.
GFX_EXPORT base::trace_event::MemoryAllocatorDumpGuid
GetGenericSharedGpuMemoryGUIDForTracing(
    uint64_t tracing_process_id,
    GenericSharedMemoryId generic_shared_memory_id);

}  // namespace gfx

namespace std {

template <>
struct hash<gfx::GenericSharedMemoryId> { … };

hash<std::pair<gfx::GenericSharedMemoryId, Second>>;

}  // namespace std

#endif  // UI_GFX_GENERIC_SHARED_MEMORY_ID_H_