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Start an asynchronous wait on the object handle.
template< typename WaitToken = default_completion_token_t<executor_type>> DEDUCED async_wait( WaitToken && token = default_completion_token_t< executor_type >());
This function is be used to initiate an asynchronous wait against the object handle. It is an initiating function for an asynchronous operation, and always returns immediately.
The completion
token that will be used to produce a completion handler, which
will be called when the wait completes. Potential completion tokens
include use_future,
use_awaitable,
yield_context,
or a function object with the correct completion signature. The function
signature of the completion handler must be:
void handler( const asio::error_code& error // Result of operation. );
Regardless of whether the asynchronous operation completes immediately
or not, the completion handler will not be invoked from within this
function. On immediate completion, invocation of the handler will
be performed in a manner equivalent to using post.
void(asio::error_code)