nsPointerHashKeys.h

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

/* vim: set ts=8 sts=2 et sw=2 tw=80: */

/* 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 http://mozilla.org/MPL/2.0/. */

/* Definitions for nsPtrHashKey<T> and nsVoidPtrHashKey.  */

#ifndef nsPointerHashKeys_h

#define nsPointerHashKeys_h

#include "nscore.h"

#include "mozilla/Attributes.h"

#include "mozilla/HashFunctions.h"

#include "PLDHashTable.h"

/**

 * hashkey wrapper using T* KeyType

 * @see nsTHashtable::EntryType for specification

*/

template <class T>

class nsPtrHashKey : public PLDHashEntryHdr {

 public:

  using KeyType = T*;

  using KeyTypePointer = const T*;

  explicit nsPtrHashKey(const T* aKey) : mKey(const_cast<T*>(aKey)) {}

  nsPtrHashKey(nsPtrHashKey&& aToMove) = default;

  ~nsPtrHashKey() = default;

  KeyType GetKey() const { return mKey; }

  bool KeyEquals(KeyTypePointer aKey) const { return aKey == mKey; }

  static KeyTypePointer KeyToPointer(KeyType aKey) { return aKey; }

  static PLDHashNumber HashKey(KeyTypePointer aKey) {

    return mozilla::HashGeneric(aKey);

  enum { ALLOW_MEMMOVE = true };

 protected:

  T* MOZ_NON_OWNING_REF mKey;

};

using nsVoidPtrHashKey = nsPtrHashKey<const void>;

#endif  // nsPointerHashKeys_h