> So that leaves me with using an array of bool and rank() then, I guess...

Correction: I mean array of strings and find.

On 05/02/14 15:38, "Nordlöw" via Digitalmars-d-learn wrote:
> 
> template MemberNamesUnion(E...) if (allSatisfy!(isEnum, E))
> {
>     bool[string] allMembers;   // used to detect member collisions
>     mixin({
>             string r = "enum MemberNamesUnion { ";
>             foreach (T; E) {
>                 import std.range: join;
>                 foreach (member; __traits(allMembers, T)) {
>                     static assert (member in allMembers, "Member collision");
>                     allMembers[member] = true;
>                 }
>                 r ~= [__traits(allMembers, T)].join(",") ~ ",";
>             }
>             return r ~ " }";
>         }());
> }
> 
> It fails as
> 
> enums.d(25,46): Error: static variable allMembers cannot be read at compile time
> enums.d(25,21):        while evaluating: static assert("a" in allMembers)
> 
> Is there a solution to this problem?

Move the AA declaration to inside the lambda, remove the 'static' from the assert, and fix the condition ("member !in allMembers"), then it will work.

artur

On Friday, 2 May 2014 at 15:18:06 UTC, Artur Skawina via Digitalmars-d-learn wrote:
> On 05/02/14 15:38, "Nordlöw" via Digitalmars-d-learn wrote:
>> 
>> template MemberNamesUnion(E...) if (allSatisfy!(isEnum, E))
>> {
>>     bool[string] allMembers;   // used to detect member collisions
>>     mixin({
>>             string r = "enum MemberNamesUnion { ";
>>             foreach (T; E) {
>>                 import std.range: join;
>>                 foreach (member; __traits(allMembers, T)) {
>>                     static assert (member in allMembers, "Member collision");
>>                     allMembers[member] = true;
>>                 }
>>                 r ~= [__traits(allMembers, T)].join(",") ~ ",";
>>             }
>>             return r ~ " }";
>>         }());
>> }
>> 
>> It fails as
>> 
>> enums.d(25,46): Error: static variable allMembers cannot be read at compile time
>> enums.d(25,21):        while evaluating: static assert("a" in allMembers)
>> 
>> Is there a solution to this problem?
>
> Move the AA declaration to inside the lambda, remove the 'static'
> from the assert, and fix the condition ("member !in allMembers"), then
> it will work.
>
> artur

But that will also move the compile time check to a runtime one.

On 05/02/14 17:27, Meta via Digitalmars-d-learn wrote:
> On Friday, 2 May 2014 at 15:18:06 UTC, Artur Skawina via Digitalmars-d-learn wrote:
>> On 05/02/14 15:38, "Nordlöw" via Digitalmars-d-learn wrote:
>>>
>>> template MemberNamesUnion(E...) if (allSatisfy!(isEnum, E))
>>> {
>>>     bool[string] allMembers;   // used to detect member collisions
>>>     mixin({
>>>             string r = "enum MemberNamesUnion { ";
>>>             foreach (T; E) {
>>>                 import std.range: join;
>>>                 foreach (member; __traits(allMembers, T)) {
>>>                     static assert (member in allMembers, "Member collision");
>>>                     allMembers[member] = true;
>>>                 }
>>>                 r ~= [__traits(allMembers, T)].join(",") ~ ",";
>>>             }
>>>             return r ~ " }";
>>>         }());
>>> }
>>>
>>> It fails as
>>>
>>> enums.d(25,46): Error: static variable allMembers cannot be read at compile time
>>> enums.d(25,21):        while evaluating: static assert("a" in allMembers)
>>>
>>> Is there a solution to this problem?
>>
>> Move the AA declaration to inside the lambda, remove the 'static' from the assert, and fix the condition ("member !in allMembers"), then it will work.
> 
> But that will also move the compile time check to a runtime one.

No; mixin arguments are always evaluated at CT.

artur

> artur

Collision detection should now be complete.

https://github.com/nordlow/justd/blob/master/enums.d

Superb!