# Docs issue template Request comes from https://github.com/ARMmbed/mbed-os/pull/9158 ## Page link ## Expected to find... > It might be useful to extend the code guidelines to mention that data structures local to a C++ files should be declared inside an anonymous namespace ## Found No mention of anonymous namespace cc @kjbracey-arm @pan- @SenRamakri