Where can we use std::barrier over std::latch?

问题

I recently heard new c++ standard features which are:

1. std::latch
2. std::barrier

I cannot figure it out ,in which situations that they are applicable and useful over one-another.

• If someone can raise an example for how to use each one of them wisely it would be really helpful.

来源：https://stackoverflow.com/questions/48985967/where-can-we-use-stdbarrier-over-stdlatch