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 constraint< is_convertible< OtherExecutor, InnerExecutor >::value >::type  = 0);
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