Filling an array at compile time

[Anonymouse]

On Wednesday, 9 February 2022 at 08:12:52 UTC, Vindex wrote:
> Will the loop (foreach) run at compile time? How can I make it 
> work at compile time?
>
> ```
> import std.csv, std.stdio;
>
> alias Record = Tuple!(string, string, string);
>
> immutable string[][] table;
>
> shared static this() {
>     string csvText = import("file.csv");
>     foreach (record; csvReader!Record(csvText)) {
>         table ~= [record[0], record[1], record[2]];
>     }
> }
>
> void main() {
>     writeln(table):
> }
> ```

I would do this.

```
import std;

alias Record = Tuple!(string, string, string);

static immutable string[][] table = () {
     string[][] table;
     string csvText = import("file.csv");

     foreach (record; csvReader!Record(csvText)) {
         table ~= [record[0], record[1], record[2]];
     }

     return table;
}();

pragma(msg, table);  // Available at compile-time

void main() {
     writeln(table);
}
```

And then `-J{path}` to tell the compiler where to find `file.csv`.

```
dmd -J. csv.d
```