Using closure in function scope to make "real" private class members

[Ola Fosheim Grøstad]

On Monday, 6 June 2022 at 11:17:39 UTC, zjh wrote:
> You don't need remember it at all, because only those who need 
> it use it .

Doesn't work, you need to read other people's code.

Rarely used things should usually not be in the language.

> Like `C++'s` `friend`, I don't use it at all. I don't care.

Oh, but I remember most of C++'s language features! The C++ 
language itself is not so big.

The complexity in C++ is elsewhere (what to do where if you want 
to avoid such and such problem, how to solve this and that issue, 
etc).