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我正在尝试使用“实现指针”来掩盖我正在使用Concurrency :: unbounded_buffer（来自VC ++ 2010）的事实。问题是，我正在使用模板执行此操作，并陷入了编译错误。这是代码：

BlockingQueue.h

#pragma once

namespace DRA{
namespace CommonCpp{
    //Forward declaration
    template <class Element> class BlockingQueueImpl;

    template <class Element>
    class BlockingQueue{
        BlockingQueueImpl<Element>* m_pImpl;
    //Forbid copy and assignment
        BlockingQueue( const BlockingQueue& );
        BlockingQueue& operator=( const BlockingQueue& );
    public:
        BlockingQueue();
        ~BlockingQueue();
        void Push( Element newElement );
        Element Pop();
    };
}
}

BlockingQueue.cpp

#include "BlockingQueue.h"
#include "BlockingQueueImpl.h"

using namespace DRA::CommonCpp;

BlockingQueue<class Element>::BlockingQueue():
    m_pImpl( new BlockingQueueImpl<Element>() ){
}

BlockingQueue<class Element>::~BlockingQueue(){
    //Let the implementation's destructor handle pending Pops
    delete m_pImpl;
}

template<class …