c++11,线程池之二--有等待线程池中任务完成功能的线程池

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#include <deque>#include <future>#include <memory>#include <functional>#include <iostream>#include <iostream>class function_wrapper{    struct impl_base {        virtual void call()=0;        virtual ~impl_base() {}    };    std::unique_ptr<impl_base> impl;    template<typename F>    struct impl_type: impl_base    {        F f;        impl_type(F&& f_): f(std::move(f_)) {}        void call() { f(); }    };public:    template<typename F>    function_wrapper(F&& f):        impl(new impl_type<F>(std::move(f)))    {}    void call() { impl->call(); }    function_wrapper(function_wrapper&& other):        impl(std::move(other.impl))    {}    function_wrapper& operator=(function_wrapper&& other)    {        impl=std::move(other.impl);        return *this;    }    function_wrapper(const function_wrapper&)=delete;    function_wrapper(function_wrapper&)=delete;    function_wrapper& operator=(const function_wrapper&)=delete;};

class thread_pool{public:    std::deque<function_wrapper> work_queue;    template<typename FunctionType>    std::future<typename std::result_of<FunctionType()>::type>    submit(FunctionType f)    {        typedef typename std::result_of<FunctionType()>::type result_type;                std::packaged_task<result_type()> task(std::move(f));        std::future<result_type> res(task.get_future());        work_queue.push_back(std::move(task));        return res;    }   public:      thread_pool():          joiner(threads)      {          done.store(false);          unsigned const thread_count=std::thread::hardware_concurrency();          try          {              for(unsigned i=0;i<thread_count;++i)              {                  threads.push_back(                      std::thread(&thread_pool::worker_thread,this));              }          }          catch(...)          {              done=true;              throw;          }      }        ~thread_pool()      {          done=true;      }        template<typename FunctionType>      void submit(FunctionType f)      {          work_queue.push(std::function<void()>(f));      }  };

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