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Initiate an asynchronous wait for the group of operations.
template< typename CancellationCondition, typename CompletionToken> auto async_wait( CancellationCondition cancellation_condition, CompletionToken && token);
Launches the group and asynchronously waits for completion.
A function object, called on completion of an operation within the
group, that is used to determine whether to cancel the remaining
operations. The function object is passed the arguments of the completed
operation's handler. To trigger cancellation of the remaining operations,
it must return a cancellation_type value
other than asio::cancellation_type::none.
A completion token whose signature is comprised of a std::array<std::size_t,
N>
indicating the completion order of the operations, followed by all
operations' completion handler arguments.
The library provides the following cancellation_condition
types: