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A detailed post that shows how to implement a stateful meta-container that is usable where a constant-expression is required, effectively making it possible to store away different states during compilation of a program. The approach enables the world of meta-template programming to closely follow the semantics of imperative programming.

This post is part of the series regarding non-constant constant-expressions in C++, previous posts are linked below:

* http://b.atch.se/posts/constexpr-counter/

* http://b.atch.se/posts/non-constant-constant-expressions/