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The as_single completion token adapter can be used to specify that the
completion handler arguments should be combined into a single argument.
For completion signatures with a single parameter, the argument is
passed through as-is. For signatures with two or more parameters, the
arguments are combined into a tuple.
The as_single adapter may be used in conjunction with use_awaitable and
structured bindings as follows:
auto [e, n] = co_await socket.async_read_some(
boost::asio::buffer(data), as_single(use_awaitable));
Alternatively, it may be used as a default completion token like so:
using default_token = as_single_t<use_awaitable_t<>>;
using tcp_socket = default_token::as_default_on_t<tcp::socket>;
// ...
awaitable<void> do_read(tcp_socket socket)
{
// ...
auto [e, n] = co_await socket.async_read_some(boost::asio::buffer(data));
// ...
}