1/*
2 * Copyright 2015-present Facebook, Inc.
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#pragma once
18
19#include <folly/Range.h>
20#include <folly/container/F14Map.h>
21
22namespace folly {
23
24template <
25 class Mapped,
26 class Hash = f14::DefaultHasher<std::string>,
27 class Eq = f14::DefaultKeyEqual<std::string>,
28 class Alloc = f14::DefaultAlloc<std::pair<std::string const, Mapped>>>
29struct StringKeyedUnorderedMap
30 : public F14NodeMap<std::string, Mapped, Hash, Eq, Alloc> {
31 using Super = F14NodeMap<std::string, Mapped, Hash, Eq, Alloc>;
32
33 using require_transparent_hash = typename Hash::is_transparent;
34 using require_transparent_eq = typename Eq::is_transparent;
35
36 public:
37 using Super::Super;
38 StringKeyedUnorderedMap() : Super() {}
39
40 // TODO(T31574848): Work around libstdc++ versions (e.g., GCC < 6) with no
41 // implementation of N4387 ("perfect initialization" for pairs and tuples) to
42 // support existing callsites that list-initialize:
43 // m.insert({sp, x});
44 std::pair<typename Super::iterator, bool> insert(
45 std::pair<StringPiece, Mapped> const& p) {
46 return this->emplace(p.first, p.second);
47 }
48 std::pair<typename Super::iterator, bool> insert(
49 std::pair<StringPiece, Mapped>&& p) {
50 return this->emplace(std::move(p));
51 }
52};
53
54} // namespace folly
55