multithreading - In C++, how would I make a random number (either 1 or 2) that changes every 5 minutes? -

multithreading - In C++, how would I make a random number (either 1 or 2) that changes every 5 minutes? -

i'm trying create simple game , have shop in game. want every 5 minutes(if function changeitem() called) item in shop either switches or stays same. have no problem generating random number, have yet find thread shows how create generate differently each 5 minutes. give thanks you.

in short, maintain track of lastly time changeitem() function called. if more 5 minutes since lastly time called, utilize random number generator generate new number. otherwise, utilize saved number lastly time generated.

c++ multithreading random timer