Re: Is there a way to make a function parameter accept only values that can be checked at compile time?

[rempas via Digitalmars-d-learn]

On Wednesday, 29 December 2021 at 14:49:40 UTC, Steven 
Schveighoffer wrote:
On 12/29/21 3:55 AM, rempas wrote:

Thanks! That's cool but I don't want this to be this way. Or 
at least I want it to be able to take a default value so we 
don't have to get passed all the time.
OK:

```
extern (C) void main() {
   void print_num(int mul = 100)(int num) {
     static if (is(mul == ten)) {
       printf("%d\n", num * 10);
     } else static if (is(mul == three)) {
       printf("%d\n", num * 3);
     } else {
       printf("%d\n", num);
     }
   }

   int multi = 211;
   print_num!3(10);     // Set the value
   print_num(30);        // Get the default value, have the 
"else" branch executed
}
```

Template parameters are just like regular parameters, but 
compile time.

-Steve

Oh! Didn't knew you could do something like that! It works as 
expected! Thanks a lot!