### default_completion_token

Traits type used to determine the default completion token type associated with a type (such as an executor).

    template<
        typename T>
    struct default_completion_token

##### Types

Name | Description
--- | ---
type | If T has a nested type default_completion_token_type, T::default_completion_token_type. Otherwise the typedef type is not defined.

A program may specialise this traits type if the `T` template parameter in the specialisation is a user-defined type.

Specialisations of this trait may provide a nested typedef `type`, which is a default-constructible completion token type.

##### Requirements

Header: `asio/async_result.hpp`

Convenience header: `asio.hpp`