boost :: asio :: high_resolution_timer的用法示例？

Question

我正在尝试使用boost的高分辨率计时器并且出现编译错误。请从下面的代码片段，

boost::asio::io_service    _svc; 
boost::asio::high_resolution_timer _timer(_svc, boost::chrono::seconds(1)); 

错误：

error: no matching function for call to ‘boost::asio::basic_waitable_timer::basic_waitable_timer(boost::asio::io_service&, boost::chrono::seconds)’

Answer 1

高分辨率定时器显然使用C++ 11的计时库的引擎盖下（如果可用）：boost/asio/high_resolution_timer.hpp线48

#elif defined(BOOST_ASIO_HAS_STD_CHRONO) 
typedef basic_waitable_timer< 
    std::chrono::high_resolution_clock> 
    high_resolution_timer; 

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#include <boost/asio.hpp> 
#include <boost/asio/high_resolution_timer.hpp> 

int main() { 
    boost::asio::io_service    _svc; 
    boost::asio::high_resolution_timer _timer(_svc); 

    _timer.expires_from_now(std::chrono::milliseconds(100)); 
}