memory_order_consume has been around since C++11, but discouraged. If you want a good overview of what it is supposed to do, https://preshing.com/20140709/the

memory_order_consume has been around since C++11, but discouraged. If you want a good overview of what it is supposed to do, https://preshing.com/20140709/the-purpose-of-memory_order_consume-in-cpp11/ https://preshing.com/20140709/the-purpose-of-memory_order_co... goes into more detail with lots of examples and motivation.