Union with bits ?

[Ali Çehreli]

On 6/13/23 17:59, Paul wrote:
 > I would like to have labeled bits in a union with a ubyte. Something
 > like this:
 > ```d
 > struct MyStruct {
 >      union {
 >          ubyte status;
 >          bit A, B, C…etc
 >      }
 > }
 > ```
 > Is something like this possible?
 >
 > Thanks

D's string mixin syntax may not be the best, the implementation may be 
slower than necessary, and the concept may be strange (not macros but 
very similar) but I still find phobos's bifields to be brilliant.

   https://dlang.org/phobos/std_bitmanip.html#bitfields

import std.bitmanip;

struct MyStruct {
     union {
         ubyte status;
         mixin(bitfields!(
                   ubyte, "A", 1,
                   ubyte, "B", 1,
                   ubyte, "C", 1,
                   ubyte, "padding", 5,));
     }
}

void main() {
     auto m = MyStruct();
     m.B = 1;
     assert(m.status == 2);
}

Ali