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Specify
          use_awaitable_t as the default completion token type.
        
typedef use_awaitable_t default_completion_token_type;
| Name | Description | 
|---|---|
| Adapts an executor to add the use_awaitable_t completion token as the default. | 
| Name | Description | 
|---|---|
| Function helper to adapt an I/O object to use use_awaitable_t as its default completion token type. | |
| Default constructor. | 
          The use_awaitable_t class, with its value use_awaitable,
          is used to represent the currently executing coroutine. This completion
          token may be passed as a handler to an asynchronous operation. For example:
        
awaitable<void> my_coroutine()
{
  std::size_t n = co_await my_socket.async_read_some(buffer, use_awaitable);
  ...
}
          When used with co_await, the initiating function (async_read_some
          in the above example) suspends the current coroutine. The coroutine is
          resumed when the asynchronous operation completes, and the result of the
          operation is returned.
        
          Header: boost/asio/use_awaitable.hpp
        
          Convenience header: boost/asio.hpp