Can I output strings using core.stdc.stdio?

[Ferhat Kurtulmuş]

On Wednesday, 23 December 2020 at 09:06:02 UTC, Godnyx wrote:
> On Wednesday, 23 December 2020 at 08:50:50 UTC, Mike Parker 
> wrote:
>> On Wednesday, 23 December 2020 at 08:45:15 UTC, Godnyx wrote:
>>
>>> Yep and I find it out! It won't work with templates and/or 
>>> variadic function parameters. It says that the variable can't 
>>> be read at compile time (so I can't cast it) or it will work 
>>> but it will give me a segmentation fault (lol hello C). Any 
>>> idea why this is happening in those cases?
>>
>> Please show the code that's causing the error. Without it, all 
>> anyone can do is keep making suggestions that *might* be the 
>> problem. With the code, someone can point to it exactly.
>
> Yep that's the best thing I can do! Code:
>
> import core.stdc.stdio : printf;
> import std.string : toStringz;
>
> void put(A...)(string prompt, A args) {
>     for (ulong i = 0; i < args.length; i++) {
>         if (typeof(args[i]).stringof == "string")
>             printf("%s\n", args[i].toStringz);
>     }
> }
>
> void main() {
>     string h = "World!";
>     string w = "World!";
>     put(h, w);
> }
>
> I'm getting two errors. First that i can't be read at compile 
> time and second that I don't initialize the function right. So 
> I know I'm doing something wrong but I don't know why... Any 
> ideas?

I didn't dive into your use case, but you should use static 
foreach in this case:

void put(A...)(string prompt, A args) {
     static foreach (ulong i; 0..args.length) {
         if (typeof(args[i]).stringof == "string")
             printf("%s\n", args[i].toStringz);
     }
}