A good example of observer design pattern

Question

Can anyone share a code reference to describe good use case of observer design pattern ? I am into c++

Answer 1

Not a C++ example but if you have seen web code even once in your life, you will probably know
window.addEventListener('click', function () { ... });
And so every time the user clicks something, a message is sent to every observer that is willing to listen!
What's great is that the Observer doesn't need to do much, it just calls .listen on the Observable. And the Observable doesn't need to do much either, it just walks through an array of Observables and calls them. It's an easy way to make anything talk to anything.

Answer 2

Event listeners use the observer pattern, usually used with UI, among other stuff, pretty much as ~swim~ described.
Sadly I can't find any good examples right off the bat. :(