Thank you for the article. Opaque struct is an interesting subject for people who want to go deeper into their understanding of C.
If I could add/emphasis two points to the article:
FILE is a famous example of struct using this trick. So, even if yon don’t often need to develop an opaque struct in C, you certainly use such struct daily without knowing.
you can’t declare a variable with an opaque type (because the compiler would need to know its size). Everything must be handled through pointers, and the library has to provide functions to allocate/destroy the struct, like fopen() and fclose() for FILE.
I have a love hate relationship with C. I love the simplicity of the language. Although it is simpler, it is certainly possible to emulate many features found in other languages like the encapsulation, though rarely perfectly, and not every feature.
I also like C because I am dealing with code at a lower level leads me to having a much better understanding of what is happening under the hood. However, this lower level access allows you to accidentally write bad code that could introduce a vulnerability
Same. It’s not a perfect language, far from such. It is simple but not easy. I too believe it helps with understanding exactly what the code is doing via being lower level.
Shooting yourself in the foot is a great way to learn discipline. It is how I learned to be careful of what I am writing. However, I think in most cases a memory safe language could be better.
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