Fixing up threadpool

daggy/include/daggy/ThreadPool.hpp

@@ -22,7 +22,7 @@ namespace daggy {
 
       std::future<void> addTask(AsyncTask fn);
     private:
-      using QueuedAsyncTask = std::shared_ptr<AsyncTask>;
+      using QueuedAsyncTask = std::shared_ptr<std::packaged_task<void()>>;
 
       std::atomic<bool>        shutdown_;
       std::mutex               guard_;

daggy/src/ThreadPool.cpp

@@ -13,7 +13,9 @@ ThreadPool::ThreadPool(size_t nWorkers) {
             std::unique_lock<std::mutex> lk(guard_);
             cv_.wait(lk, []{ return true; });
             if (shutdown_) return;
-            tsk.swap(taskQueue_.front());
+            if (taskQueue_.empty()) continue;
+
+            tsk = taskQueue_.front();
             taskQueue_.pop_front();
           }
 
@@ -41,7 +43,7 @@ std::future<void> ThreadPool::addTask(std::function<void()> fn) {
   std::future<void> result = task->get_future();
   {
     std::unique_lock<std::mutex> lk(guard_);
-    taskQueue_.emplace_back(std::move(task));
+    taskQueue_.push_back(task);
   }
   cv_.notify_one();
   return result;