Can't use variadic arguments to functions that use templates

[JS]

On Saturday, 20 July 2013 at 18:57:18 UTC, Jesse Phillips wrote:
> On Saturday, 20 July 2013 at 18:27:23 UTC, JS wrote:
>> is there any way to pass t directly to A?
>>
>> template A(T...) doesn't seem work nor does using an alias. 
>> (or at least, when I try to foreach over it, it doesn't work).
>
> template A(size_t L) {
>     enum A = L;
> }
>
> template B(T...) {
> void B(T b) {
>     import std.stdio;
>     foreach(Type; T) {
>         pragma(msg, Type.stringof);
>     }
>     foreach(v; b) {
>         writeln(v);
>     }
> }}
>
> void foo(T...)(string s, T t) {
>     auto n = A!(t.length);
>     B(t);// t is runtime information
>          // T is compile time information
> }
>
> void main() {
>     foo("x", 1, 2);
> }

I know I tried that but:

import std.cstream, std.stdio;


template B(T...) {
	string B(T b) {
		string s;
		foreach(Type; T) pragma(msg, Type.stringof);
		foreach(v; b) s ~= v.stringof;
		return s;
	}
}

void foo(T...)(T t)
{
     pragma(msg, B(t));
}

void main() {
     foo("x", "a", "b");
	din.getc();
}


does work. I need to have B generate compile time code so it is 
efficient. Your method calls an actual function at runtime so it 
is nearly as fast as it can be.