Mixin operator 'if' directly

[bauss]

On Wednesday, 19 December 2018 at 13:37:17 UTC, Andrey wrote:
> Hi,
> Here is a template mixin:
>> mixin template create(alias input, uint index, alias data)
>> {
>>     if(input.length < index) return;
>> 
>>     // ... some code
>> }
>
> When I try to compile it, I get:
>> Error: declaration expected, not if
>
> Is it possible to mixin operator 'if' directly inside my 
> template mixin?

What you want to use is "static if".

The correct way to do the above would be this:

mixin template create(alias input, uint index, alias data)
{
     static if(input.length >= index) // Reversed the logic.
     {
         // ... some code
     }
}