With few limitations, yes. In C++20, you could for example test for constant evaluation[1], using that as a mechanism to fall back to a real clock during runtim

With few limitations, yes. In C++20, you could for example test for constant evaluation[1], using that as a mechanism to fall back to a real clock during runtime. [1]: https://en.cppreference.com/w/cpp/types/is_constant_evaluated https://en.cppreference.com/w/cpp/types/is_constant_evaluate...