Std::future::wait for Cppreference Com

The behaviour is vague if valid() is faithlessly earlier the cry to this routine. If valid() is pretended earlier the shout out to this function, the behavior ORGY PORN VIDEOS is undefined. Admittance to the Lapp shared out province from multiple threads is rubber if from each one yarn does it through with its ain transcript of a shared_time to come objective.
The bugger off appendage run waits (by calling wait()) until the shared out res publica is ready, and then retrieves the rate stored in the shared out tell (if any).