Compile time values & implicit conditional mixin, as an alternative to tertiary operator hell and one-compile-time functions.

[Sebastiaan Koppe]

On Saturday, 16 January 2021 at 15:17:04 UTC, Stefan Koch wrote:
> On Saturday, 16 January 2021 at 14:56:18 UTC, Sebastiaan Koppe 
> wrote:
>> On Saturday, 16 January 2021 at 14:20:19 UTC, Paul wrote:
>>> On Saturday, 16 January 2021 at 04:13:12 UTC, Paul Backus 
>>> wrote:
>>
>> you can also use CTFE. Generate the values in a normal 
>> function, assign it to an enum.
>>
>> ---
>> string generateValues(uint L)() {
>>     string result = "value.x";
>>     if (L != 1) { result ~= ",value.y"; }
>>     if (L != 2) { result ~= ",value.z"; }
>>     if (L != 3) { result ~= ",value.w"; }
>>     return result;
>> }
>>
>> enum string values = generateValues!3();
>>
>> pragma(msg, values);
>>
>> void main(){};
>> ---
>
> What you are doing here is an expensive template instantiation 
> for no reason.

Yes thanks. I translated the thing without thinking too much.