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

(Deprecated: Use expiry().) Get the stream buffer's expiry time relative to now.

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

void expires_from_now(
    const duration & expiry_time);
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