c++11線程安全的隊列的類的定義

#include <queue>
#include <mutex>
#include <condition_variable>
#include <memory>

template<class T>
class threadsafe_queue
{
private:
	mutable std::mutex mut;
	std::queue<T> data_queue;
	std::condition_variable data_con;
public:
	threadsafe_queue(){}
	threadsafe_queue(threadsafe_queue const& other)
	{
	std::lock_guard<std::mutex> lk(other.mut);
	data_queue = other.data_queue;
	}
	void push(T tValue)
	{
	std::lock_guard<std::mutex> lk(mut);
	data_queue.push(tValue);
	data_con.notify_one();
	}
	void wait_and_pop(T& tValue)
	{
	std::unique_lock<std::mutex> lk(mut);
	data_con.wait(lk,[this]{return !data_queue.empty();});
	tValue = data_queue.front();
	data_queue.pop();
	}
	std::shared_ptr<T>wait_and_pop()
	{
	std::unique_lock<std::mutex> lk(mut);
	data_con.wait(lk,[this]{return !data_queue.empty();});
	std::shared_ptr<T> ret (std::make_shared<T>(data_queue.front()));
	data_queue.pop();
	return ret;
	}
	bool try_pop(T& tValue)
	{
	std::lock_guard<std::mutex> lk(mut);
	if(data_queue.empty())
		return false;
	tValue = data_queue.front();
	data_queue.pop();
	return true;
	}

	std::shared_ptr<T> try_pop()
	{
	std::lock_guard<std::mutex> lk(mut);
	if(data_queue.empty())
		return std::shared_ptr<T>();
	std::shared_ptr<T> ret(std::make_shared(data_queue.front()));
	data_queue.pop();
	return ret;
	}

	bool empty() const
	{
	std::lock_guard<std::mutex> lk(mut);
	return data_queue.empty();
	}
};