#### use_awaitable_t::executor_with_default::executor_with_default

Construct the adapted executor from the inner executor type.

    executor_with_default(
        const InnerExecutor & ex);
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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);
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