boost 计时器精度扩展 progress_timer 计时器扩展 类模版

//---------------------xxj
#include <boost/progress.hpp>
template<int N = 2>
class new_progress_timer : public  boost::timer, private boost::noncopyable//:public boost::progress_timer
{
public:
	new_progress_timer(std::ostream & os=std::cout):m_os(os)
	{
		BOOST_STATIC_ASSERT(N >= 0 && N <=10);//静态断言
	}

	~new_progress_timer(void)
	{
		try
		{
			//保存流的状态
			std::istream::fmtflags old_flags = m_os.setf(
				std::istream::fixed, std::istream::floatfield);
			std::streamsize old_prec = m_os.precision(N);
			//输出时间
			m_os<<elapsed()<< " s\n"<<std::endl;

			//恢复流状态
			m_os.flags(old_flags);
			m_os.precision(old_prec);
		}
		catch (...){}
	}
private:
	std::ostream & m_os;
};
//------------------------------end

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