Search elemnt in Compile-time Argument List of strings

[ParticlePeter via Digitalmars-d-learn]

On Tuesday, 26 July 2016 at 21:01:19 UTC, Ali Çehreli wrote:
> On 07/26/2016 01:58 PM, ParticlePeter wrote:
>> On Tuesday, 26 July 2016 at 20:18:48 UTC, Steven Schveighoffer 
>> wrote:
>> ...
>>> void processMember( T, ignore... )() {
>>>   foreach( member; __traits( allMembers, T )) { // this is a
>>> compile-time list, so it's a static foreach.
>>>     foreach(i, arg; ignore ){ // i is the index into the 
>>> ignore tuple
>>>       static if( arg == member ) break; // break out of the 
>>> foreach
>>> loop, need to ignore it.
>>>       else static if(i + 1 == arg.length) // this is the last 
>>> element!
>>>       {
>>>       // process member here, generate e.g. setter function 
>>> as string
>>> mixin
>>>       }
>>>     }
>>>   }
>>> }
>>
>> There is one problem with this approach, ignore might be empty 
>> (I should
>> have mentioned it). Would you know a workaround for that case 
>> as well?
>
> It should work for empty ignore. Can you show with a short 
> example please.
>
> Ali

First of all there seems to be a typo, it should not be:
   else static if(i + 1 == arg.length)

ignore must be used instead of arg, as arg.length is the length 
of a string:
   else static if(i + 1 == ignore.length)

if ignore is empty, its length is 0, so that the statement would 
always evaluate to false.

Btw, if ignore is not empty, only the last element (arg) is 
skipped.