...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
Set the timer's expiry time as an absolute time.
std::size_t expires_at( const time_type & expiry_time, boost::system::error_code & ec);
This function sets the expiry time. Any pending asynchronous wait operations will be cancelled. The handler for each cancelled operation will be invoked with the boost::asio::error::operation_aborted error code.
The expiry time to be used for the timer.
Set to indicate what error occurred, if any.
The number of asynchronous operations that were cancelled.