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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim:set ts=2 sw=2 sts=2 et cindent: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at */
#ifndef DDLogObject_h_
#define DDLogObject_h_
#include "nsString.h"
namespace mozilla {
// DDLogObject identifies a C++ object by its pointer and its class name (as
// provided in a DDLoggedTypeTrait.)
// Note that a DDLogObject could have the exact same pointer&type as a previous
// one, so extra information is needed to distinguish them, see DDLifetime.
class DDLogObject {
// Default-initialization with null pointer.
DDLogObject() : mTypeName("<unset>"), mPointer(nullptr) {}
// Construction with given non-null type name and pointer.
DDLogObject(const char* aTypeName, const void* aPointer)
: mTypeName(aTypeName), mPointer(aPointer) {
// Sets this DDLogObject to an actual object.
void Set(const char* aTypeName, const void* aPointer) {
mTypeName = aTypeName;
mPointer = aPointer;
// Object pointer, used for identification purposes only.
const void* Pointer() const { return mPointer; }
// Type name. Should only be accessed after non-null pointer initialization.
const char* TypeName() const {
return mTypeName;
bool operator==(const DDLogObject& a) const {
return mPointer == a.mPointer && (!mPointer || mTypeName == a.mTypeName);
// Print the type name and pointer, e.g.: "MediaDecoder[136078200]".
void AppendPrintf(nsCString& mString) const;
nsCString Printf() const;
const char* mTypeName;
const void* mPointer;
} // namespace mozilla
#endif // DDLogObject_h_