...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
Get the timer's expiry time relative to now.
duration_type expires_from_now() const;
Set the timer's expiry time relative to now.
std::size_t expires_from_now( const duration_type & expiry_time); std::size_t expires_from_now( const duration_type & expiry_time, boost::system::error_code & ec);