将Concurrency :: concurrent_queue与std :: unique_ptr一起使用

Question

我想使用Visual Studio 2010的并发库来在线程之间传递操作.我有我的课程,SimpleAction并指向它存储在Concurrency::concurrent_queue.

使用这个定义和"消费"逻辑它可以工作:

typedef Concurrency::concurrent_queue<SimpleAction *> ActionQueue;

while (true)
   {
   SimpleAction *action = nullptr;
   while (m_queue.try_pop(action))
      {
      action->process();
      delete action;
      }
   Sleep(100);
   }

但是,当我将其更改为std :: unique_ptr时,如下所示:

typedef Concurrency::concurrent_queue<std::unique_ptr<SimpleAction>> ActionQueue;

while (true)
   {
   std::unique_ptr<SimpleAction> action;
   while (m_queue.try_pop(action))
      {
      action->process();
      }
   Sleep(100);
   }

编译器给出以下错误消息:

F:\DevStudio\Vs2010\VC\INCLUDE\concurrent_queue.h(366) : error C2248: 'std::unique_ptr<_Ty>::unique_ptr' : cannot access private member declared in class 'std::unique_ptr<_Ty>'
    with
    [
        _Ty=`anonymous-namespace'::SimpleAction
    ]
F:\DevStudio\Vs2010\VC\INCLUDE\memory(2347) : see declaration of 'std::unique_ptr<_Ty>::unique_ptr'
    with
    [
        _Ty=`anonymous-namespace'::SimpleAction
    ]
F:\DevStudio\Vs2010\VC\INCLUDE\concurrent_queue.h(365) : while compiling class template member function 'void Concurrency::concurrent_queue<_Ty>::_Copy_item(Concurrency::details::_Concurrent_queue_base_v4::_Page &,size_t,const void *)'
    with
    [
        _Ty=std::unique_ptr<`anonymous-namespace'::SimpleAction>
    ]
test.cpp(138) : see reference to class template instantiation 'Concurrency::concurrent_queue<_Ty>' being compiled
    with
    [
        _Ty=std::unique_ptr<`anonymous-namespace'::SimpleAction>
    ]

似乎编译器不喜欢concurrent_queue中的这种结构:

/*override*/ virtual void _Copy_item( _Page& _Dst, size_t _Index, const void* _Src )
{
    new( &_Get_ref(_Dst,_Index) ) _Ty(*static_cast<const _Ty*>(_Src)); 
}

这似乎是合乎逻辑的(我们不希望复制std :: unique_ptr(必须移动它).

问题:

• 这是Visual Studio 2010的Concurrency/PPL库的已知问题/限制/特性吗？
• Visual Studio 2012中是否解决了此问题？
• 或者我做错了什么？

谢谢,帕特里克