Hi Andrey. In the Boost.Core documentation I see: "Thanks to Andrey Semashev for pointing out that emulation through a namespace could not be used within classes. Helpful comments and suggestions were also made by Kjell Elster, Phil Endecott, Joel Falcou, Mathias Gaunard, Felipe Magno de Almeida, Matt Calabrese, Vicente Botet, and Daniel James." The authors of this file are Beman (for the class based version) and me (for the namespace based). As the documentation has been mainly extracted from the file I would appreciate if both Beman and I are added as authors. BTW, there is no deprecation for the Beman version, there are just different advantages and liabilities. I suspect that the same is applied to the other component of the Boost.Core module Thanks for working on this. Vicente