• Vladimirs Nordholm (23/23) Apr 04 2018 Hello people from D-land.
• Vladimirs Nordholm (3/9) Apr 04 2018 Oops, typo in the alias. Should be `alias e this`
• Simen =?UTF-8?B?S2rDpnLDpXM=?= (5/6) Apr 04 2018 if (is(T : Enum))
• Vladimirs Nordholm (2/8) Apr 04 2018 Ah! Thanks a lot!

Vladimirs Nordholm <v vladde.net> writes:

Hello people from D-land.

Short question: Can get the type of a struct that has `alias this 
= <type>` ?

See this example, where a struct is aliased to an enum:


     enum Enum { one, two, three, fourtytwo }

     private template Mix()
     {
         this(Enum ee) { e = ee; }
         Enum e;
         alias this = e;
     }
     struct A { mixin Mix }
     struct B { mixin Mix }

     T foo(T) (T f) if (is(T == A) || is(T == B) || is(T == Enum))
     //               |------------------------------------------|
     //                         ^ I want to change this into 
something more nice looking
     {
         // ...
     }


I want to check the type in a more 'cleaner' way.

Best regards,
Vladimirs Nordholm

Vladimirs Nordholm <v vladde.net> writes:

On Wednesday, 4 April 2018 at 15:49:31 UTC, Vladimirs Nordholm 
wrote:
     private template Mix()
     {
         this(Enum ee) { e = ee; }
         Enum e;
         alias this = e;
     }


Oops, typo in the alias. Should be `alias e this`

Simen =?UTF-8?B?S2rDpnLDpXM=?= <simen.kjaras gmail.com> writes:

On Wednesday, 4 April 2018 at 15:49:31 UTC, Vladimirs Nordholm 
wrote:
 if (is(T == A) || is(T == B) || is(T == Enum))

if (is(T : Enum))

--
   Simen

Vladimirs Nordholm <v vladde.net> writes:

On Wednesday, 4 April 2018 at 15:57:19 UTC, Simen Kjærås wrote:
 On Wednesday, 4 April 2018 at 15:49:31 UTC, Vladimirs Nordholm 
 wrote:
 if (is(T == A) || is(T == B) || is(T == Enum))

 if (is(T : Enum))

 --
   Simen

Ah! Thanks a lot!