Boost C++ Libraries

...one of the most highly regarded and expertly designed C++ library projects in the world. — Herb Sutter and Andrei Alexandrescu, C++ Coding Standards

basic_deadline_timer::expires_from_now

Get the timer's expiry time relative to now.

duration_type expires_from_now() const;
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Set the timer's expiry time relative to now.

std::size_t expires_from_now(
    const duration_type & expiry_time);
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std::size_t expires_from_now(
    const duration_type & expiry_time,
    boost::system::error_code & ec);
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