• Martin Nowak (9/9) Sep 29 2014 Does anyone know a construct to turn a lambda into an infinite range.
• Brad Anderson (7/18) Sep 29 2014 I can't find anything to do it. That seems weirdly absent. You
• monarch_dodra (14/16) Sep 29 2014 AFAIK, this as never existed.
• monarch_dodra (3/4) Sep 29 2014 I threw something together, and it really works exceptionally
• Daniel =?UTF-8?B?S296w6Fr?= via Digitalmars-d-learn (4/16) Sep 29 2014 V Mon, 29 Sep 2014 19:02:36 +0200
• monarch_dodra (4/22) Sep 29 2014 That just repeats the value, but doesn't re-evaluate the value on

Martin Nowak <code dawg.eu> writes:

Does anyone know a construct to turn a lambda into an infinite range.

     import std.random;

     unittest
     {
         Random gen;
         foreach(v; xxx!(() => uniform(0, 100, gen)).take(10))
             writeln(v);
     }

I though I've seen this around somewhere but can no longer find it.

"Brad Anderson" <eco gnuk.net> writes:

On Monday, 29 September 2014 at 17:02:43 UTC, Martin Nowak wrote:
 Does anyone know a construct to turn a lambda into an infinite 
 range.

     import std.random;

     unittest
     {
         Random gen;
         foreach(v; xxx!(() => uniform(0, 100, gen)).take(10))
             writeln(v);
     }

 I though I've seen this around somewhere but can no longer find 
 it.

I can't find anything to do it. That seems weirdly absent.  You 
can abuse recurrence to do it.


     Random gen;
     foreach(v; recurrence!((a, n) => uniform(0, 100, 
gen))(0).dropOne.take(10))
         writeln(v);

"monarch_dodra" <monarchdodra gmail.com> writes:

On Monday, 29 September 2014 at 17:02:43 UTC, Martin Nowak wrote:
 I though I've seen this around somewhere but can no longer find 
 it.

AFAIK, this as never existed.

We recently merged in "cache" into phobos. This seems like a 
prime candidate to expand to also take a function/delegate, as on 
of its built-in feature is that the value of "front" is not 
changed until "popFront()" is called. Having it also accept a 
function/delegate would make sense.

The issue with *not* having that is that a "dumb" adapter would 
fail the:
r.front == r.front
Test. And I'm pretty sure this test is expected to pass, even for 
the so called "transient" ranges.

I think I'll get to it now (this week).

Thoughts?

"monarch_dodra" <monarchdodra gmail.com> writes:

On Monday, 29 September 2014 at 20:02:19 UTC, monarch_dodra wrote:
 I think I'll get to it now (this week).

I threw something together, and it really works exceptionally
well. Will file PR soon.

Daniel =?UTF-8?B?S296w6Fr?= via Digitalmars-d-learn writes:

V Mon, 29 Sep 2014 19:02:36 +0200
Martin Nowak via Digitalmars-d-learn
<digitalmars-d-learn puremagic.com> napsáno:

 Does anyone know a construct to turn a lambda into an infinite range.
 
      import std.random;
 
      unittest
      {
          Random gen;
          foreach(v; xxx!(() => uniform(0, 100, gen)).take(10))
              writeln(v);
      }
 
 I though I've seen this around somewhere but can no longer find it.

"monarch_dodra" <monarchdodra gmail.com> writes:

On Monday, 29 September 2014 at 21:16:27 UTC, Daniel Kozák via 
Digitalmars-d-learn wrote:
 V Mon, 29 Sep 2014 19:02:36 +0200
 Martin Nowak via Digitalmars-d-learn
 <digitalmars-d-learn puremagic.com> napsáno:

 Does anyone know a construct to turn a lambda into an infinite 
 range.
 
      import std.random;
 
      unittest
      {
          Random gen;
          foreach(v; xxx!(() => uniform(0, 100, gen)).take(10))
              writeln(v);
      }
 
 I though I've seen this around somewhere but can no longer 
 find it.



That just repeats the value, but doesn't re-evaluate the value on 
every call to front/popFront.