enum for beginners

[Johannes Totz]

On 15/11/2011 15:43, Johannes Totz wrote:
> On 14/11/2011 22:32, Timon Gehr wrote:
>> On 11/14/2011 11:25 PM, Johannes Totz wrote:
>>> Hi!
>>>
>>> I'm having trouble with named typed enums.
>>> This works (unnamed):
>>>
>>> enum : string
>>> {
>>> a = "a",
>>> b = "b"
>>> }
>>>
>>> int main(string[] argv)
>>> {
>>> writeln(a);
>>> return 0;
>>> }
>>>
>>>
>>> But this does not:
>>>
>>> enum X : string
>>> {
>>> a = "a", // Error: Integer constan
>>
>> t expression expected
>>> // instead of "a"
>>> b = "b" // Error: Integer constant expression expected
>>> // instead of "b"
>>> }
>>>
>>> int main(string[] argv)
>>> {
>>> writeln(X.a);
>>> return 0;
>>> }
>>>
>>>
>>> What did I miss?
>>>
>>
>> I don't know. It works for me.
>>
>> import std.stdio;
>>
>> enum X : string{
>> a = "a",
>> b = "b",
>> }
>>
>>
>> int main(string[] argv) {
>> writeln(X.a);
>> return 0;
>> }
>>
>> compiles, runs and prints "a" as expected.
>>
>> Are you using the latest version of the compiler? (DMD v2.056)
>
> I had 2.055 and just upgraded.
> But this seems to be some issue with VisualD. Compiling on the command
> line (with 2.056) works fine as expected.

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