/usr/include/thunderbird/nsInterfaceHashtable.h is in thunderbird-dev 1:52.8.0-1~deb8u1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 | /* -*- 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/. */
#ifndef nsInterfaceHashtable_h__
#define nsInterfaceHashtable_h__
#include "nsBaseHashtable.h"
#include "nsHashKeys.h"
#include "nsCOMPtr.h"
/**
* templated hashtable class maps keys to interface pointers.
* See nsBaseHashtable for complete declaration.
* @param KeyClass a wrapper-class for the hashtable key, see nsHashKeys.h
* for a complete specification.
* @param Interface the interface-type being wrapped
* @see nsDataHashtable, nsClassHashtable
*/
template<class KeyClass, class Interface>
class nsInterfaceHashtable
: public nsBaseHashtable<KeyClass, nsCOMPtr<Interface>, Interface*>
{
public:
typedef typename KeyClass::KeyType KeyType;
typedef Interface* UserDataType;
typedef nsBaseHashtable<KeyClass, nsCOMPtr<Interface>, Interface*> base_type;
nsInterfaceHashtable() {}
explicit nsInterfaceHashtable(uint32_t aInitLength)
: nsBaseHashtable<KeyClass, nsCOMPtr<Interface>, Interface*>(aInitLength)
{
}
/**
* @copydoc nsBaseHashtable::Get
* @param aData This is an XPCOM getter, so aData is already_addrefed.
* If the key doesn't exist, aData will be set to nullptr.
*/
bool Get(KeyType aKey, UserDataType* aData) const;
/**
* @copydoc nsBaseHashtable::Get
*/
already_AddRefed<Interface> Get(KeyType aKey) const;
/**
* Gets a weak reference to the hashtable entry.
* @param aFound If not nullptr, will be set to true if the entry is found,
* to false otherwise.
* @return The entry, or nullptr if not found. Do not release this pointer!
*/
Interface* GetWeak(KeyType aKey, bool* aFound = nullptr) const;
};
template<typename K, typename T>
inline void
ImplCycleCollectionUnlink(nsInterfaceHashtable<K, T>& aField)
{
aField.Clear();
}
template<typename K, typename T>
inline void
ImplCycleCollectionTraverse(nsCycleCollectionTraversalCallback& aCallback,
const nsInterfaceHashtable<K, T>& aField,
const char* aName,
uint32_t aFlags = 0)
{
for (auto iter = aField.ConstIter(); !iter.Done(); iter.Next()) {
CycleCollectionNoteChild(aCallback, iter.UserData(), aName, aFlags);
}
}
//
// nsInterfaceHashtable definitions
//
template<class KeyClass, class Interface>
bool
nsInterfaceHashtable<KeyClass, Interface>::Get(KeyType aKey,
UserDataType* aInterface) const
{
typename base_type::EntryType* ent = this->GetEntry(aKey);
if (ent) {
if (aInterface) {
*aInterface = ent->mData;
NS_IF_ADDREF(*aInterface);
}
return true;
}
// if the key doesn't exist, set *aInterface to null
// so that it is a valid XPCOM getter
if (aInterface) {
*aInterface = nullptr;
}
return false;
}
template<class KeyClass, class Interface>
already_AddRefed<Interface>
nsInterfaceHashtable<KeyClass, Interface>::Get(KeyType aKey) const
{
typename base_type::EntryType* ent = this->GetEntry(aKey);
if (!ent) {
return nullptr;
}
nsCOMPtr<Interface> copy = ent->mData;
return copy.forget();
}
template<class KeyClass, class Interface>
Interface*
nsInterfaceHashtable<KeyClass, Interface>::GetWeak(KeyType aKey,
bool* aFound) const
{
typename base_type::EntryType* ent = this->GetEntry(aKey);
if (ent) {
if (aFound) {
*aFound = true;
}
return ent->mData;
}
// Key does not exist, return nullptr and set aFound to false
if (aFound) {
*aFound = false;
}
return nullptr;
}
#endif // nsInterfaceHashtable_h__
|