0 cost template instantiation

[Hipreme]

On Thursday, 30 September 2021 at 01:56:42 UTC, Basile B. wrote:
> On Thursday, 30 September 2021 at 01:09:47 UTC, Hipreme wrote:
>> I have a template function that all it does is given a symbol, 
>> it loads a dll for its type + its name:
>>
>> ```
>> void loadSymbol(alias s, string symName = "")()
>> {
>> 	static if(symName == "")
>> 		s = cast(typeof(s))_loadSymbol(_dll, (s.stringof~"\0").ptr);
>> 	else
>> 		s = cast(typeof(s))_loadSymbol(_dll, (symName~"\0").ptr);
>> }
>> ```
>>
>>
>> The main problem is that this function is costing 2KB per 
>> instantiation, which is something pretty high. Specially if I 
>> inline, there is almost no cost when compared to its inline 
>> version. Trying to use pragma(inline, true) didn't do anything 
>> too.
>
> cant you just use a regular functions ? loading happens at 
> runtime right ?


The entire reason to having that function is having that syntax 
which would pretty much do the monkey's job for me:

Instead of writing

myFunction = cast(typeof(myFunction))_loadSymbol(_dll, 
"myFunction");

I could write

loadSymbol!myFunction;

But if no other way is found of doing that, I will do the massive 
rewriting.

Anyway, I don't think the problem is not in the way I'm doing, 
but the output, as that template could easily be inlined