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