I give up! I tried to create a reflection library but D's traits are just too screwed up!

[Adam D. Ruppe]

On Thursday, 4 April 2019 at 02:19:48 UTC, Alex wrote:
> But because there is no `T` for fields we can't do it so easy, 
> so we have to construct the name and use string mixins.

You should pass fields as an alias more often than not. It is a 
little tricky when you want to read/write it (the alias is not a 
value, so you need to pass a pointer or something separately), 
but for reflection you want to use the alias.

UDAs do not exist on types per se, since they are tied to symbols.

> mixin(`static foreach(a;  __traits(getAttributes, 
> `~T.stringof~`.`~name~`))

This shouldn't use mixin at all, and even if you do use mixin, it 
shouldn't be using stringof; .stringof is a code smell and should 
almost never be used. This bypasses the local symbol. That is 
actually the reason why you get a visibility error.

Just use T. more info: 
https://stackoverflow.com/questions/32615733/struct-composition-with-mixin-and-templates/32621854#32621854