• Arun (3/6) Oct 09 2022 Does anyone have an example for this?
• user1234 (3/9) Oct 10 2022 Recursive templates can make other templates with themselves. I
• rassoc (4/9) Oct 10 2022 Aren't UFCS chained range calls just that?
• ag0aep6g (16/22) Oct 10 2022 You can just write that down in code:
• surlymoor (3/5) Oct 10 2022 This guy could have read std.meta's documentation or source, but

Arun <aruncxy gmail.com> writes:

Stumbled upon this question on HN 
https://news.ycombinator.com/item?id=33142751#33147401

 Can I write template A and then apply it to itself to get 
 template B and then apply that onto template C to get template 
 D.

Does anyone have an example for this?

user1234 <user1234 12.de> writes:

On Monday, 10 October 2022 at 06:30:05 UTC, Arun wrote:
 Stumbled upon this question on HN 
 https://news.ycombinator.com/item?id=33142751#33147401

 Can I write template A and then apply it to itself to get 
 template B and then apply that onto template C to get template 
 D.

 Does anyone have an example for this?

Recursive templates can make other templates with themselves. I 
dont feel to provide an example ATM tho.

rassoc <rassoc posteo.de> writes:

On 10/10/22 08:30, Arun via Digitalmars-d-learn wrote:
 Stumbled upon this question on HN
https://news.ycombinator.com/item?id=33142751#33147401
 
 Can I write template A and then apply it to itself to get template B and then
apply that onto template C to get template D.

 
 Does anyone have an example for this?

Aren't UFCS chained range calls just that?

range.map!foo.filter!bar.fold!baz;

These templates return new template ranges that transform themselves according
to their inputs via Design by Introspection. For example, joiner of joiner of
joiner would allow you to lazily flatten a multi dim array.

ag0aep6g <anonymous example.com> writes:

On Monday, 10 October 2022 at 06:30:05 UTC, Arun wrote:
 Stumbled upon this question on HN 
 https://news.ycombinator.com/item?id=33142751#33147401

 Can I write template A and then apply it to itself to get 
 template B and then apply that onto template C to get template 
 D.

 Does anyone have an example for this?

You can just write that down in code:

```d
template D() { enum D = "It's me, template D!"; }

template A(alias MyA)
{
     template A(alias MyC)
     {
         alias A = D;
     }
}

template C() {}

alias B = A!A;
alias MaybeD = B!C;
pragma(msg, MaybeD!()); /* prints "It's me, template D!" */
```

surlymoor <surlymoor cock.li> writes:

On Monday, 10 October 2022 at 06:30:05 UTC, Arun wrote:
 Stumbled upon this question on HN 
 https://news.ycombinator.com/item?id=33142751#33147401

This guy could have read std.meta's documentation or source, but 
instead makes assumptions and lazes around.