/src/mozilla-central/xpcom/ds/nsDataHashtable.h
Line | Count | Source |
1 | | /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ |
2 | | /* vim: set ts=8 sts=2 et sw=2 tw=80: */ |
3 | | /* This Source Code Form is subject to the terms of the Mozilla Public |
4 | | * License, v. 2.0. If a copy of the MPL was not distributed with this |
5 | | * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ |
6 | | |
7 | | #ifndef nsDataHashtable_h__ |
8 | | #define nsDataHashtable_h__ |
9 | | |
10 | | #include "nsHashKeys.h" |
11 | | #include "nsBaseHashtable.h" |
12 | | #include "mozilla/Maybe.h" |
13 | | |
14 | | /** |
15 | | * templated hashtable class maps keys to simple datatypes. |
16 | | * See nsBaseHashtable for complete declaration |
17 | | * @param KeyClass a wrapper-class for the hashtable key, see nsHashKeys.h |
18 | | * for a complete specification. |
19 | | * @param DataType the simple datatype being wrapped |
20 | | * @see nsInterfaceHashtable, nsClassHashtable |
21 | | */ |
22 | | template<class KeyClass, class DataType> |
23 | | class nsDataHashtable |
24 | | : public nsBaseHashtable<KeyClass, DataType, DataType> |
25 | | { |
26 | | private: |
27 | | typedef nsBaseHashtable<KeyClass, DataType, DataType> BaseClass; |
28 | | |
29 | | public: |
30 | | using typename BaseClass::KeyType; |
31 | | using typename BaseClass::EntryType; |
32 | | |
33 | 6 | nsDataHashtable() {}nsDataHashtable<nsRefPtrHashKey<nsIMemoryReporter>, bool>::nsDataHashtable() Line | Count | Source | 33 | 3 | nsDataHashtable() {} |
nsDataHashtable<nsPtrHashKey<nsIMemoryReporter>, bool>::nsDataHashtable() Line | Count | Source | 33 | 3 | nsDataHashtable() {} |
|
34 | | explicit nsDataHashtable(uint32_t aInitLength) |
35 | | : BaseClass(aInitLength) |
36 | 6 | { |
37 | 6 | } nsDataHashtable<nsIDPointerHashKey, nsFactoryEntry*>::nsDataHashtable(unsigned int) Line | Count | Source | 36 | 3 | { | 37 | 3 | } |
nsDataHashtable<nsCStringHashKey, nsFactoryEntry*>::nsDataHashtable(unsigned int) Line | Count | Source | 36 | 3 | { | 37 | 3 | } |
|
38 | | |
39 | | /** |
40 | | * Retrieve a reference to the value for a key. |
41 | | * |
42 | | * @param aKey the key to retrieve. |
43 | | * @return a reference to the found value, or nullptr if no entry was found |
44 | | * with the given key. |
45 | | */ |
46 | | DataType* GetValue(KeyType aKey) |
47 | | { |
48 | | if (EntryType* ent = this->GetEntry(aKey)) { |
49 | | return &ent->mData; |
50 | | } |
51 | | return nullptr; |
52 | | } |
53 | | |
54 | | /** |
55 | | * Retrieve the value for a key and remove the corresponding entry at |
56 | | * the same time. |
57 | | * |
58 | | * @param aKey the key to retrieve and remove |
59 | | * @return the found value, or Nothing if no entry was found with the |
60 | | * given key. |
61 | | */ |
62 | | mozilla::Maybe<DataType> GetAndRemove(KeyType aKey) |
63 | | { |
64 | | mozilla::Maybe<DataType> value; |
65 | | if (EntryType* ent = this->GetEntry(aKey)) { |
66 | | value.emplace(std::move(ent->mData)); |
67 | | this->RemoveEntry(ent); |
68 | | } |
69 | | return value; |
70 | | } |
71 | | }; |
72 | | |
73 | | #endif // nsDataHashtable_h__ |