proxygen
ColdClass.h
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1 /*
2  * Copyright 2017-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 /* Tag any class as `cold` by inheriting from folly::cold::ColdClass
18  *
19  * Intended use: things like folly::Unexpected which are designed to only be
20  * instantiated on error paths.
21  */
22 #pragma once
23 
24 #include <folly/CppAttributes.h>
25 
26 namespace folly {
27 // ColdClass should be in its own namespace: inheriting from any class adds its
28 // innermost namespace to the namespaces inspected during
29 // argument-dependent-lookoup. We want people to be able to derive from this
30 // without implicitly picking up the folly namespace for ADL on their classes.
31 namespace cold_detail {
32 struct ColdClass {
34 };
35 } // namespace cold_detail
36 
37 /* using override */ using cold_detail::ColdClass;
38 } // namespace folly
—— Concurrent Priority Queue Implementation ——
Definition: AtomicBitSet.h:29
requires E e noexcept(noexcept(s.error(std::move(e))))
#define FOLLY_COLD
FOLLY_COLD ColdClass() noexcept
Definition: ColdClass.cpp:18