Doubt Branchless code

[matheus]

On Tuesday, 7 April 2026 at 23:48:37 UTC, Richard (Rikki) Andrew 
Cattermole wrote:
> On 07/04/2026 7:08 AM, matheus wrote:
>> Hello,
>> 
>> Back in C days I used to write code with function pointer to 
>> avoid writing branches inside loops,
>> 
>> To avoid this:
>> 
>> for(;;){
>>    if(opt == 1){ func_1(); }else{func_2()};
>> }
>> Or maybe using switch if there were more options...
>> 
>> So I used to do:
>> 
>> if(opt == 1){ fp  = &func_1(); }else{ fp = &func_2()};
>> 
>> for(;;){
>>   fp();
>> }
>> 
>> 
>> I would like to know if there is a different way of doing that 
>> in D during RT execution and dynamic change of function 
>> execution before the loops?
>> 
>> Thanks in advance,
>> 
>> Matheus.
>
> How I typically do it:
>
> ```d
> void outer() {
> 	void inner(bool a, bool b)() {
> 		for(;b;) {
> 			static if (a) {}
> 		}
> 	}
>
> 	if (cond1 && !cond2)
> 		inner!(true, false);
> 	else if (cond2 && !cond1)
> 		inner!(false, true);
> 	else if (cond1 && cond2)
> 		inner!(true, true);
> 	else
> 		inner!(false, false);
> }
> ```

But this is CT, my problem was to this during RT.

Thanks anyway for responding,

Matheus.