It is by all accounts. It pretty much relies on the underlying machine memory model, and ordering of operations in a C++ program directly corresponds to the re

It is by all accounts. It pretty much relies on the underlying machine memory model, and ordering of operations in a C++ program directly corresponds to the resulting ordering of the operations on the machine it is running on. Furthermore, the language itself is clearly speicific to register machines and follows the corresponding semantics -- it'd be hard to target other kinds of computers from C++.