waitable_timer_service::expires

(Deprecated: Use expiry().) Get the expiry time for the timer as an absolute time.

time_point expires_at(
    const implementation_type & impl) const;
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Set the expiry time for the timer as an absolute time.

std::size_t expires_at(
    implementation_type & impl,
    const time_point & expiry_time,
    asio::error_code & ec);
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