1 // Copyright 2022 The gRPC Authors
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at
6 //
7 //     http://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS,
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 // See the License for the specific language governing permissions and
13 // limitations under the License.
14 #ifndef GRPC_SRC_CORE_LIB_EVENT_ENGINE_HANDLE_CONTAINERS_H
15 #define GRPC_SRC_CORE_LIB_EVENT_ENGINE_HANDLE_CONTAINERS_H
16 
17 #include <grpc/support/port_platform.h>
18 
19 #include <stddef.h>
20 
21 #include <cstdint>
22 #include <utility>
23 
24 #include "absl/container/flat_hash_set.h"
25 #include "absl/hash/hash.h"
26 
27 #include <grpc/event_engine/event_engine.h>
28 
29 namespace grpc_event_engine {
30 namespace experimental {
31 
32 // Used for heterogeneous lookup of TaskHandles in abseil containers.
33 template <typename TaskHandle>
34 struct TaskHandleComparator {
35   struct Hash {
36     using HashType = std::pair<const intptr_t, const intptr_t>;
37     using is_transparent = void;
operatorTaskHandleComparator::Hash38     size_t operator()(const TaskHandle& handle) const {
39       return absl::Hash<HashType>()({handle.keys[0], handle.keys[1]});
40     }
41   };
42 };
43 
44 using TaskHandleSet =
45     absl::flat_hash_set<EventEngine::TaskHandle,
46                         TaskHandleComparator<EventEngine::TaskHandle>::Hash>;
47 
48 using ConnectionHandleSet = absl::flat_hash_set<
49     EventEngine::ConnectionHandle,
50     TaskHandleComparator<EventEngine::ConnectionHandle>::Hash>;
51 
52 using LookupTaskHandleSet = absl::flat_hash_set<
53     EventEngine::DNSResolver::LookupTaskHandle,
54     TaskHandleComparator<EventEngine::DNSResolver::LookupTaskHandle>::Hash>;
55 
56 }  // namespace experimental
57 }  // namespace grpc_event_engine
58 
59 #endif  // GRPC_SRC_CORE_LIB_EVENT_ENGINE_HANDLE_CONTAINERS_H
60