[CMake] some comments on the LIST command

[Alexander Neundorf]

Hi, 
 
> Von: Gaetan Lehmann <gaetan.lehmann at jouy.inra.fr> 
>  
> Hi, 
>  
> We have implemented for WrapITK some list functions in pure cmake. It 
> would be  
> nice to be able to replace them by native functions. Some of them are 
> already  
> there (SORT for example), but some are missing: 
>  - LIST(UNIQUE <list>) remove all the duplicate items in the list. 
>  - LIST(INTERSECT <list> <element> [<element> ...]) compute the 
> intersection  
> of the list and the list of element given in parameter. I think the 
output 
> variable should not contain any duplicate item, but it should be 
> discussed. 
>  - LIST(HAS_ITEM <list> <item> <output variable>) set output variable 
to 
> ON if  
> the item is in the list, and to OFF otherwise. 
>  
> Also, I'm surprised to see that the LIST commands always modify the 
list, 
> and  
> does not produce a new one. It is definitively not always the desired  
> behavior. It is not a important issue - some macro can easily be 
> created to workaround that. 
 
You could just use SET() to create a copy beore the LIST() command. 
 
> Finally, I think REMOVE and REMOVE_ITEM should be swapped - for me, the 
> item  
> is what is removed from the list, not its index. Currently, we have: 
>  
>          LIST(REMOVE <variable> <value> [<value> ...]) 
>          LIST(REMOVE_ITEM <variable> <index> [<index> ...]) 
 
Maybe REMOVE_VALUE and REMOVE_INDEX ? 
 
Bye 
Alex 
 

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