enum for beginners

[Steven Schveighoffer]

On Tue, 15 Nov 2011 11:15:01 -0500, Johannes Totz <johannes at jo-t.de> wrote:

> On 15/11/2011 15:56, Steven Schveighoffer wrote:
>> On Tue, 15 Nov 2011 10:55:44 -0500, Steven Schveighoffer
>> <schveiguy at yahoo.com> wrote:
>>
>>> On Tue, 15 Nov 2011 10:47:22 -0500, Johannes Totz <johannes at jo-t.de>
>>> wrote:
>>>> Ah, when I compile on the command line with:
>>>>
>>>> dmd -g -debug main.d
>>>>
>>>> main.d(6): Error: enum main.X base type must be of integral type, not
>>>> char[]
>>>> main.d(8): Error: cannot implicitly convert expression ("a") of type
>>>> char[1u] to int
>>>> main.d(9): Error: cannot implicitly convert expression ("b") of type
>>>> char[1u] to int
>>>
>>> dmd must map to a D1 version, where string literals were char[N], not
>>> immutable(char)[]. In D1, you could not have enums that were strings.
>>
>> to check, type dmd without args on the command line, it will tell you
>> the version.
>
> There is a 1.071 version somewhere in the path...
> C:\Users\...>dmd
> DMD32 D Compiler v1.071
>
> But if I do...
> C:\Users\...>C:\D\dmd2\windows\bin\dmd.exe -g -debug main.d
> main.d(8): Error: Integer constant expression expected instead of "a"
> main.d(9): Error: Integer constant expression expected instead of "b"
> main.d(8): Error: Integer constant expression expected instead of "a"
> main.d(9): Error: Integer constant expression expected instead of "b"
>
> However...
> C:\Users\...>C:\D\dmd2\windows\bin\dmd.exe main.d
> C:\Users\...>main.exe
> a
>
>
> Getting rid of 1.071...
> C:\Users\...>dmd
> DMD32 D Compiler v2.056
>
> C:\Users\...>dmd -g -debug main.d
> main.d(8): Error: Integer constant expression expected instead of "a"
> main.d(9): Error: Integer constant expression expected instead of "b"
> main.d(8): Error: Integer constant expression expected instead of "a"
> main.d(9): Error: Integer constant expression expected instead of "b"

Don't have a windows box handy, but this works on Linux:

steves at steve-laptop:~/testd$ cat testenum.d
import std.stdio;

enum X : string {
     a = "a",
     b = "b",
}

void main()
{
     writeln(X.b);
}
steves at steve-laptop:~/testd$ ~/dmd-2.056/linux/bin32/dmd -g -debug  
testenum.d
steves at steve-laptop:~/testd$ ./testenum
b

Can you post your exact code that doesn't work with dmd 2.056?  This is  
all I have from your previous post.  I can't see why it wouldn't work.

-Steve