> Stateful Metaprogeamming Bit of a fun fact, but as one of the linked articles states the C++ committee doesn't seem to be a fan of stateful metaprogramming s

> Stateful Metaprogeamming Bit of a fun fact, but as one of the linked articles states the C++ committee doesn't seem to be a fan of stateful metaprogramming so its status is somewhat unclear. From Core Working Group issue 2118: > Defining a friend function in a template, then referencing that function later provides a means of capturing and retrieving metaprogramming state. This technique is arcane and should be made ill-formed. > Notes from the May, 2015 meeting: > CWG agreed that such techniques should be ill-formed, although the mechanism for prohibiting them is as yet undetermined. [0]: https://cplusplus.github.io/CWG/issues/2118.html https://cplusplus.github.io/CWG/issues/2118.html