#### basic_waitable_timer::expires_from_now

(Deprecated: Use `expiry()`.) Get the timer's expiry time relative to now.

    duration expires_from_now() const;
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(Deprecated: Use `expires_after()`.) Set the timer's expiry time relative to now.

    std::size_t expires_from_now(
        const duration & expiry_time);
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    std::size_t expires_from_now(
        const duration & expiry_time,
        asio::error_code & ec);
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