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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
| Name | Description | 
|---|---|
| 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.
      
        Header: boost/asio/async_result.hpp
      
        Convenience header: boost/asio.hpp