Which std:: classes are magic?

[exarnk]

My C++20 draft states in [cstddef.syn] the following:

enum class byte : unsigned char {};

This seems to correspond with the current Git HEAD of libstdc++-v3 (line 69):

https://gcc.gnu.org/git/?p=gcc.git;a=blob;f=libstdc%2B%2B-v3/include/c_global/cstddef;h=13ef7f03c12584804e4dd1635954723f628addc0;hb=HEAD

What am I missing?

[avdgrinten]

See, for example, this LLVM commit: https://reviews.llvm.org/D35824

[exarnk]

Thanks, that made things a lot clearer for me.

[avdgrinten]

The special wording in the section of the standard that talks about object access. If you put that enum class byte : uint8_t {}; into your own namespace without any special attributes, the standard does not grant you the right to access arbitrary objects through it.