Re: Class Array in D?

[Jeroen Bollen]

On Wednesday, 20 November 2013 at 18:23:37 UTC, Ali Çehreli wrote:
On 11/20/2013 10:12 AM, Jeroen Bollen wrote:
> is there a way I can pass a TypeTulip to a function?

alias TypeTulip = TypeTuple;

;)

> Something like:
>
> Can I create a class array in D? Something like:
>
> interface A {}
> class AA: A {}
> class AB: A {}
> class AC: A {}
>
> ClassList!A list = new ClassList!A {AA, AB, AC};
>
> void testf(ulong testv) {
>      A a = new list[testv];
> }
>
> I know about TypeTuple but that doesn't allow setting a
requirement does
> it?

import std.stdio;
import std.typetuple;

interface A {}
class AA: A {}
class AB: A {}
class AC: A {}

alias TypeTulip = TypeTuple;
alias list = TypeTuple!(AA, AB, AC);

void testf(ulong testv) {
    // NOTE: This is a compile-time foreach
    foreach (i, Type; list) {
        if (i == testv) {
            A a = new Type();
            writefln("I made it: %s", a);
        }
    }
}

void main()
{
    testf(1);
}

Note that the foreach loop above is not a loop that gets 
executed at run time. Its body is expanded inline as code 
multiple times as needed. I try to explain this a little under 
the "Compile-time foreach" and "foreach with TypeTuple" 
sections here:

  http://ddili.org/ders/d.en/tuples.html

Ali

That doesn't allow specifying a base class all members should be 
a part of though, or does it?