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Specify
          use_coro_t as the default completion token type.
        
typedef use_coro_t default_completion_token_type;
| Name | Description | 
|---|---|
| Adapts an executor to add the use_coro_t completion token as the default. | 
| Name | Description | 
|---|---|
| as_default_on [static] | Function helper to adapt an I/O object to use use_coro_t as its default completion token type. | 
| use_coro_t [constructor] | 
                    Default constructor.  | 
          The use_coro_t class, with its value use_coro,
          is used to represent an operation that can be awaited by the current resumable
          coroutine. This completion token may be passed as a handler to an asynchronous
          operation. For example:
        
coro<void> my_coroutine(tcp::socket my_socket)
{
  std::size_t n = co_await my_socket.async_read_some(buffer, use_coro);
  ...
}
          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/experimental/use_coro.hpp
        
Convenience header: None