...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 expiry time for the timer relative to now.
duration_type expires_from_now( const implementation_type & impl) const;
Set the expiry time for the timer relative to now.
std::size_t expires_from_now( implementation_type & impl, const duration_type & expiry_time, boost::system::error_code & ec);