c++ - How do I wait_any for two things of different type in a loop? -

how can wait 2 or more things (with different types) @ same time? in event loop:

while(true) {     ppl::task<letter> msg1 = waitforletter(); //one letter month     ppl::task<sms> msg2 = waitforsms(); //one sms hour      //wait_any. how tasks of different types? } 

i'll answer own post.

"ppl power pack" supports "heterogeneous when_any":

https://pplpp.codeplex.com/wikipage?title=heterogeneous%20when_any

on unrelated note seems few people use ppl. there 97 ppl tagged questions on stackoverflow. have no answers. (tbb has 450, seems more active community)