Github user phrocker commented on a diff in the pull request:
https://github.com/apache/nifi-minifi-cpp/pull/71#discussion_r108924995
--- Diff: libminifi/include/utils/ThreadPool.h ---
@@ -0,0 +1,287 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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.
+ */
+#ifndef LIBMINIFI_INCLUDE_THREAD_POOL_H
+#define LIBMINIFI_INCLUDE_THREAD_POOL_H
+
+#include <iostream>
+#include <atomic>
+#include <mutex>
+#include <vector>
+#include <queue>
+#include <future>
+#include <thread>
+namespace org {
+namespace apache {
+namespace nifi {
+namespace minifi {
+namespace utils {
+
+/**
+ * Worker task
+ * purpose: Provides a wrapper for the functor
+ * and returns a future based on the template argument.
+ */
+template< typename T>
+class Worker{
+public:
+ explicit Worker(std::function<T()> &task) : task(task)
+ {
+ promise = std::make_shared<std::promise<T>>();
+ }
+
+ /**
+ * Move constructor for worker tasks
+ */
+ Worker(Worker &&other) : task (std::move(other.task)),
+ promise(other.promise)
+ {
+ }
+
+
+ /**
+ * Runs the task and takes the output from the funtor
+ * setting the result into the promise
+ */
+ void run()
+ {
+ T result = task();
+ promise->set_value(result);
+ }
+
+ Worker<T>(const Worker<T>&) = delete;
+ Worker<T>& operator = (const Worker<T>&) = delete;
+
+ Worker<T>& operator = (Worker<T>&&) ;
+
+ std::shared_ptr<std::promise<T>> getPromise();
+
+private:
+ std::function<T()> task;
+ std::shared_ptr<std::promise<T>> promise;
+};
+
+template< typename T>
--- End diff --
comment to remind people that && will take ownership of Worker
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