39 lines
1.3 KiB
C++
39 lines
1.3 KiB
C++
/*
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* Copyright 2017-present Facebook, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/* Tag any class as `cold` by inheriting from folly::cold::ColdClass
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*
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* Intended use: things like folly::Unexpected which are designed to only be
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* instantiated on error paths.
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*/
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#pragma once
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#include <folly/CppAttributes.h>
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namespace folly {
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// ColdClass should be in its own namespace: inheriting from any class adds its
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// innermost namespace to the namespaces inspected during
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// argument-dependent-lookoup. We want people to be able to derive from this
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// without implicitly picking up the folly namespace for ADL on their classes.
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namespace cold_detail {
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struct ColdClass {
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FOLLY_COLD ColdClass() noexcept;
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};
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} // namespace cold_detail
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/* using override */ using cold_detail::ColdClass;
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} // namespace folly
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