C++ Reactive Programming

Hot versus Cold Observables

In most  examples in the previous chapter, we saw that Producers were created in Observable functions. A Producer can also  be created outside an Observable function, and a reference to the Producer can be put inside the Observable function. An Observable that refers to a Producer which was created outside its scope is called a hot Observable. Any Observable where we created a Producer instance inside (an Observable)  is called a cold Observable. To make matters clear, let's write a program to demonstrate a cold Observable:

//---------- ColdObservable.cpp 
#include <rxcpp/rx.hpp> 
#include <memory> 
int main(int argc, char *argv[])  
{ //----------- Get a Coordination auto eventloop = rxcpp::observe_on_event_loop(); ...