The simplest possible example of an atomic in C++ is an atomic flag#include <atomic> std :: atomic < bool > flag ( false ); int main () { flag . Operations With AtomicsThe operations you can perform with atomics are straightforward:You can store some value into them with a store() method. Intuition For Ordering#include <cassert> #include <thread> int data = 0 ; void producer () { data = 100 ; // Write data } void consumer () { assert ( data == 100 ); } int main () { std :: thread t1 ( producer ); std :: thread t2 ( consumer ); t1 . load ()) ; assert ( data == 100 ); } int main () { std :: thread t1 ( producer ); std :: thread t2 ( consumer ); t1 . load ( std :: memory_order_acquire )) ; assert ( data == 100 ); } int main () { std :: thread t1 ( producer ); std :: thread t2 ( consumer ); t1 .