On Friday, 6 May 2022 at 00:41:18 UTC, zjh wrote:
Hello everyone,I have following function:
```d
import core.stdc.stdio;
void f(int i,int j){
printf("%i,%i",i,j);
}
```
I want to forward `int[N]` to `(int i,int j)` etc. How can I
write a forwarding function?
```d
void ff(alias g,int...I)(int[2]k){
g(k[I]);
}//How to unpack template variable parameters?
void f(int[2]k){
ff!(f,0,1)(k);//how to forward?
}
```
main function:
```d
extern(C):void main()
{
int[2] a=[2,4];
f(a);//calling like this
}
```
Try this:
```d
import core.stdc.stdio;
void f(int i,int j){
printf("%i,%i",i,j);
}
import std.range : iota;
import std.traits : isStaticArray;
import std.meta : AliasSeq;
template expand(alias arr)
if(isStaticArray!(typeof(arr))){
auto get(size_t I)(){
return arr[I];
}
alias Result = AliasSeq!();
static foreach(I; iota(0, arr.length))
Result = AliasSeq!(Result, get!I);
alias expand = Result;
}
extern(C):void main(){
int[2] a=[2,4];
f(expand!a);
}
```
