This has to be an old, or known bug, but a quick search found nothing...

import std.stdio;

enum FOO : int { A, B, C }

void main()
{
  FOO a = FOO.A;
  writefln(a);
  writefln("%d",a);
}

neither writefln works. Both give "Error: std.format formatArg". Note the enum is typed, it doesn't seem to matter whether it is or not. A quick un-educated peek in doFormat shows no switch case for enums, so unless they're classified as ints?

Regan

Regan Heath wrote:
> This has to be an old, or known bug, but a quick search found nothing...
> 
> import std.stdio;
> 
> enum FOO : int { A, B, C }
> 
> void main()
> {
>   FOO a = FOO.A;
>   writefln(a);
>   writefln("%d",a);
> }
> 
> neither writefln works. Both give "Error: std.format formatArg". Note the  enum is typed, it doesn't seem to matter whether it is or not. A quick  un-educated peek in doFormat shows no switch case for enums, so unless  they're classified as ints?

Clearly the TypeInfo for enums is still not properly implemented.  But if using %d, it certainly ought to just output the numerical value.

AIUI, the plan for %s (or no active format string) on enums is to have it output the enum constant name.  But it isn't clear what it should do if there's no matching constant (as with a set of bit flags) or more than one.

Stewart.

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