C++11 线程安全的BlockingQueue实现

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参考了muduo的BlockingQueue的实现，用C++11改写：

#ifndef _BLOCKINGQUEUE_H_#define _BLOCKINGQUEUE_H_#include <mutex>#include <condition_variable>#include <deque>#include <assert.h>template <typename T>class BlockingQueue {public:    using MutexLockGuard = std::lock_guard<std::mutex>;    BlockingQueue()        : _mutex(),          _notEmpty(),          _queue()    {    }    BlockingQueue(const BlockingQueue &) = delete;    BlockingQueue& operator=(const BlockingQueue &) = delete;    void put(const T &x)    {        {            MutexLockGuard lock(_mutex);            _queue.push_back(x);        }        _notEmpty.notify_one();    }    void put(T &&x)    {        {            MutexLockGuard lock(_mutex);            _queue.push_back(std::move(x));        }        _notEmpty.notify_one();    }    T take()    {        std::unique_lock<std::mutex> lock(_mutex);        _notEmpty.wait(lock, [this]{  return !this->_queue.empty(); });          assert(!_queue.empty());        T front(std::move(_queue.front()));        _queue.pop_front();        return  front;    }    size_t size() const     {        MutexLockGuard lock(_mutex);        return _queue.size();    }private:    mutable std::mutex _mutex;    std::condition_variable _notEmpty;    std::deque<T> _queue;};#endif  // _BLOCKINGQUEUE_H_

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