text: /*
   * Copyright (c) Facebook, Inc. and its affiliates.
   *
   * 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.
   */
  
  #pragma once
  
  #include <memory>
  #include <thread>
  
  #include <folly/ScopeGuard.h>
  #include <folly/executors/thread_factory/ThreadFactory.h>
  
  namespace folly {
  
  class InitThreadFactory : public ThreadFactory {
   public:
    explicit InitThreadFactory(
        std::shared_ptr<ThreadFactory> threadFactory,
        Func&& threadInitializer,
        Func&& threadFinializer = [] {})
        : threadFactory_(std::move(threadFactory)),
          threadInitFini_(std::make_shared<ThreadInitFini>(
              std::move(threadInitializer),
              std::move(threadFinializer))) {}
  
    std::thread newThread(Func&& func) override {
      return threadFactory_->newThread(
          [func = std::move(func), threadInitFini = threadInitFini_]() mutable {
            threadInitFini->initializer();
            SCOPE_EXIT {
              threadInitFini->finalizer();
            };
            func();
          });
    }
  
   private:
    std::shared_ptr<ThreadFactory> threadFactory_;
    struct ThreadInitFini {
      ThreadInitFini(Func&& init, Func&& fini)
          : initializer(std::move(init)), finalizer(std::move(fini)) {}
  
      Func initializer;
      Func finalizer;
    };
    std::shared_ptr<ThreadInitFini> threadInitFini_;
  };
  
  } // namespace folly
  