### use_awaitable_t

A completion token that represents the currently executing coroutine.

    template<
        typename Executor = any_io_executor>
    struct use_awaitable_t

##### Types

Name | Description
--- | ---
as_default_on_t | Type alias to adapt an I/O object to use use_awaitable_t as its default completion token type.
executor_with_default | Adapts an executor to add the use_awaitable_t completion token as the default.

##### Member Functions

Name | Description
--- | ---
as_default_on [static] | Function helper to adapt an I/O object to use use_awaitable_t as its default completion token type.
use_awaitable_t [constructor] | Default constructor. — Constructor used to specify file name, line, and function name.

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.

##### Requirements

Header: `asio/use_awaitable.hpp`

Convenience header: `asio.hpp`