Is there a convention for "private" struct members?

• generate-opaque-structs

  2 0 0.0 CMake

  Example to show how to generate opaque structs with proper size and alignment

Opaque structs and memory allocation are orthogonal. You can just take the size and alignment of the struct and create a new one with a byte buffer: https://github.com/friendlyanon/generate-opaque-structs

• SDS

  48 4,773 0.0 C

  Simple Dynamic Strings library for C

The approach you suggest works in some cases, but I don't think the one you suggest is very good. I think a good example of such use, is sds string. He uses a hidden prefix, instead of suffix, but that is just an implementation detail. It works because he is returning a pointer to the user data. However, sds string should only be manipulated via functions, while user data can be manipulated like C strings. There is only one public header, but what user is concern with, is just the opaque pointer 'sds', which is manipulated by functions, so those structs that sds string are could as well be in a private header.

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