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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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"
/**
* hashkey wrapper using T* KeyType
*
* @see nsTHashtable::EntryType for specification
*/
template<class T>
class nsPtrHashKey : public PLDHashEntryHdr
{
public:
typedef T* KeyType;
typedef const T* KeyTypePointer;
explicit nsPtrHashKey(const T* aKey) : mKey(const_cast<T*>(aKey)) {}
nsPtrHashKey(const nsPtrHashKey<T>& aToCopy) : mKey(aToCopy.mKey) {}
~nsPtrHashKey() {}
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 NS_PTR_TO_UINT32(aKey) >> 2;
}
enum { ALLOW_MEMMOVE = true };
protected:
T* MOZ_NON_OWNING_REF mKey;
};
typedef nsPtrHashKey<const void> nsVoidPtrHashKey;
#endif // nsPointerHashKeys_h
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