Support for const variants #2

Activity

1. MaikKlein commented on Feb 27, 2017

   

   MaikKlein

   on Feb 27, 2017

   Owner

   More actions

   Could you explain what you mean by const?

   Something like this?

   const FOO: u8 = 0b0100;
    #[derive(EnumFlags, Copy, Clone, Debug)]
   #[repr(u8)]
   pub enum Test {
       A = 0b0001,
       B = 0b0010,
       C = FOO,
       D = 0b1000,
   }
   
2. henninglive commented on Feb 27, 2017

   

   henninglive

   on Feb 27, 2017

   ContributorAuthor

   More actions

   Yes
3. MaikKlein

   added

   enhancement

   on Feb 27, 2017
4. MaikKlein

   self-assigned this

   on Feb 27, 2017
5. MaikKlein commented on Feb 27, 2017

   

   MaikKlein

   on Feb 27, 2017

   Owner

   More actions

   This should be possible, unless syn doesn't expose this in ConstExpr.
6. MaikKlein commented on Feb 28, 2017

   

   MaikKlein

   on Feb 28, 2017

   Owner

   More actions

   I am not quite sure if that is currently possible. I don't see a way to access the value of a const var. https://dtolnay.github.io/syn/syn/struct.PathSegment.html

   Alternatively I could implement another derive that wouldn't do any safety checks, then I don't need to inspect the value and therefore const values could be supported.