Please clarify the following code

Revision en3, by swagata93, 2019-05-29 06:20:03

I couldn't understand the meaning of the following code which is part of a program...It will be very helpful if anyone clarify this...Thank you all!!

#ifdef ONPC
  mt19937 rnd(228);
#else
  mt19937 rnd(chrono::high_resolution_clock::now().time_since_epoch().count());
#endif

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  Rev. Lang. By When Δ Comment
en3 English swagata93 2019-05-29 06:20:03 0 please don't consider the previous one. this one is correct
en2 English swagata93 2019-05-29 06:17:31 20
en1 English swagata93 2019-05-29 06:15:46 314 Initial revision (published)