Implemented releasing of weak tasks.

include/TaskManager.h

@@ -136,6 +136,23 @@ public:
 		m_tasks.push_back(std::move(in_task));
 	}
 
+	bool IsManagedTask(const WeakTaskHandle& in_task)
+	{
+		return std::find(m_strongRefs.begin(), m_strongRefs.end(), in_task) != m_strongRefs.end();
+	}
+
+	WeakTask ReleaseWeakTask(const WeakTaskHandle& in_task)
+	{
+		assert(!IsManagedTask(in_task));
+
+		auto itWeak = std::find(m_tasks.begin(), m_tasks.end(), in_task);
+		assert(itWeak != m_tasks.end());
+		WeakTask task = std::move(*itWeak);
+		*itWeak = nullptr; // otherwise the next line will kill the task (in destructor)
+		m_tasks.erase(itWeak);
+		return task;
+	}
+
 	Task<> ReleaseManagedTask(const WeakTaskHandle& in_task)
 	{
 		auto itWeak = std::find(m_tasks.begin(), m_tasks.end(), in_task);