part of previous commit (missed description)

stlpatch to make vs2013 work with packaged_task<void()>.
Thanks to Michael Rasmussen (lap777).
Ref: http://connect.microsoft.com/VisualStudio/feedback/details/791185/std-packaged-task-t-where-t-is-void-or-a-reference-class-are-not-movable

g2log/src/stlpatch_future.hpp

@@ -0,0 +1,71 @@
+/**
+* 2013/12/28 Bugfix for Visual Studio 2013 which does not handle well 
+* std::packaged_task<void()>. Thanks to Michael Rasmussen (lap777)
+* Ref: workarounds at http://connect.microsoft.com/VisualStudio/feedback/details/791185/std-packaged-task-t-where-t-is-void-or-a-reference-class-are-not-movable
+*/
+#pragma once
+#if (defined(WIN32) || defined(_WIN32) || defined(__WIN32__))
+namespace std {
+
+   template<class... _ArgTypes>
+   class packaged_task<void(_ArgTypes...)>
+   {
+      promise<void> _my_promise;
+      function<void(_ArgTypes...)> _my_func;
+
+   public:
+      packaged_task() {
+      }
+
+      template<class _Fty2>
+      explicit packaged_task(_Fty2&& _Fnarg)
+         : _my_func(_Fnarg) {
+      }
+
+      packaged_task(packaged_task&& _Other)
+         : _my_promise(move(_Other._my_promise)),
+         _my_func(move(_Other._my_func)) {
+      }
+
+      packaged_task& operator=(packaged_task&& _Other) {
+         _my_promise = move(_Other._my_promise);
+         _my_func = move(_Other._my_func);
+         return (*this);
+      }
+
+      packaged_task(const packaged_task&) = delete;
+      packaged_task& operator=(const packaged_task&) = delete;
+
+      ~packaged_task() {
+      }
+
+      void swap(packaged_task& _Other) {
+         swap(_my_promise, _Other._my_promise);
+         swap(_my_func, _Other._my_func);
+      }
+
+      explicit operator bool() const {
+         return _my_func != false;
+      }
+
+      bool valid() const {
+         return _my_func != false;
+      }
+
+      future<void> get_future() {
+         return _my_promise.get_future();
+      }
+
+      void operator()(_ArgTypes... _Args) {
+         _my_func(forward<_ArgTypes>(_Args)...);
+         _my_promise.set_value();
+      }
+
+      void reset() {
+         _my_promise.swap(promise<void>());
+         _my_func.swap(function<void(_ArgTypes...)>());
+      }
+   };
+
+}; // namespace std
+#endif // defined(WIN32) ...