##### experimental::as_single_t::executor_with_default::executor_with_default (2 of 2 overloads)

Convert the specified executor to the inner executor type, then use that to construct the adapted executor.

    template<
        typename OtherExecutor>
    executor_with_default(
        const OtherExecutor & ex,
        typename enable_if< is_convertible< OtherExecutor, InnerExecutor >::value >::type *  = 0);