enum for beginners

[Johannes Totz]

On 15/11/2011 16:30, Steven Schveighoffer wrote:
> 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.

-g is what makes it fail, -debug is fine.

----------------------------------------
module main;

import std.stdio;


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

int main(string[] argv)
{
	writeln(X.a);

	return 0;
}
----------------------------------------