Set the timer's expiry time as an absolute time.

std::size_t expires_at(
    const time_type & expiry_time);

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.

Parameters

Return Value

The number of asynchronous operations that were cancelled.

Exceptions