• ddcovery (6/18) Sep 27 2020 I have a "variation" of "unaryFun" that I name "unaryProp" that,
• Adam D. Ruppe (6/10) Sep 27 2020 Not really and I'd actually suggest not trying because even if it
• ddcovery (2/13) Sep 27 2020 Thanks Adam.

ddcovery <antoniocabreraperez gmail.com> writes:

I have a "variation" of "unaryFun" that I name "unaryProp" that, 
basically, doesn't require to specify "a." at the beginning of 
the expression.

 template unaryProp(alias propName)
 {
   static assert(is(typeof(propName) : string), "Sorry, propName 
 must be an string");
   auto unaryProp(ElementType)(auto ref ElementType a)
   {
     return mixin("a." ~ propName);
   }
 }

 assert( "hello".unaryProp!"length" == 5 );

Problem is I need to check that "propName" is a valid property 
name at compile time

 i.e. checking this Regex expression
 `^[a-zA-Z_]*[a-zA-Z0-9_]*[a-zA-Z][a-zA-Z0-9_]*$`

Is there any way to check a regular expression at compile time?

Adam D. Ruppe <destructionator gmail.com> writes:

On Sunday, 27 September 2020 at 21:38:43 UTC, ddcovery wrote:
 i.e. checking this Regex expression
 `^[a-zA-Z_]*[a-zA-Z0-9_]*[a-zA-Z][a-zA-Z0-9_]*$`

 Is there any way to check a regular expression at compile time?

Not really and I'd actually suggest not trying because even if it 
did work, it'd probably be very slow.

But that regex there is pretty easy to translate to a little 
hand-written loop function that would do the job runtime, ctfe 
both and do it quickly.

ddcovery <antoniocabreraperez gmail.com> writes:

On Sunday, 27 September 2020 at 21:41:25 UTC, Adam D. Ruppe wrote:
 On Sunday, 27 September 2020 at 21:38:43 UTC, ddcovery wrote:
 i.e. checking this Regex expression
 `^[a-zA-Z_]*[a-zA-Z0-9_]*[a-zA-Z][a-zA-Z0-9_]*$`

 Is there any way to check a regular expression at compile time?

 Not really and I'd actually suggest not trying because even if 
 it did work, it'd probably be very slow.

 But that regex there is pretty easy to translate to a little 
 hand-written loop function that would do the job runtime, ctfe 
 both and do it quickly.

Thanks Adam.