On 8 Jul 2025 11:23, Gennaro Prota via Boost wrote:

Hi,

I found that many include guard macros in Boost contain "__HPP" (note the double underscore). It would be nice to reduce those underscores to one, because identifiers containing two consecutive underscores "are reserved to the implementation for any use" (C++ standard, [lex.name]).

I think, this is best done with PRs to the respective libraries.