How to use std.meta.Filter?

[Steven Schveighoffer]

On 4/21/18 1:46 PM, Dr.No wrote:
> On Saturday, 21 April 2018 at 17:15:47 UTC, Jonathan M Davis wrote:
>> On Saturday, April 21, 2018 16:05:22 Dr.No via Digitalmars-d-learn wrote:
>>> import std.meta : Filter;
>>> enum isNotReservedSymbol(string name) = name != "none" && name !=
>>> "lastToken";
>>> enum string[] members = staticMembers!Token;
>>> static foreach(member; Filter!(isNotReservedSymbol, members))
>>> {{
>>>
>>>
>>> This return the error:
>>>
>>>   Error: template instance `pred!(["none", "word", "n", "digits",
>>> "name", /* my whole array here */ ])  does not match template
>>> declaration isNotReservedSymbol(string name)
>>>
>>> how should have isNotReservedSymbol be defined?
>>
>> std.meta.Filter operates on an AliasSeq, not a dynamic array. If you 
>> have an array, then you can just use std.algorithm.iteration.filter 
>> with a normal lambda.
>>
> 
> I've tried use normal filter - albeit i'm willing to do all that at 
> runtin, but I got f cannot be read at compile time.
> 
> static foreach(member; staticMembers!Token.filter!(f => 
> isNotReservedSymbol!(member))

Filter probably should work on arrays readable at compile time. I bet it 
just hasn't been updated since static foreach was introduced.

-Steve