Hi all,

I've a custom generator, and is modelled as a structure forwardRange, and I want to be able to use it like this, printing the first ten fibonacci:

---
struct ForEacher(Range){
    Range* r;
    this(ref Range r_){ r=&r_; }
    @property bool empty(){ return r.empty; }
    @property auto front(){ return r.front; }
    void popFront(){ r.popFront(); }
}
auto forEacher(Range)(ref Range r){
    return ForEacher!Range(r);
}
void main(){
    auto fib = recurrence!("a[n-1] + a[n-2]")(1, 1);

    foreach(e; fib.forEacher){
        static i = 0; i++; if(i == 5) break;
        writeln(e);
    }
    foreach(e; fib.forEacher){
        static j = 0; j++; if(j == 5) break;
        writeln(e);
    }

    or

    writeln(fib.forEacher.take(5));
    writeln(fib.forEacher.take(5));

}
---

There's something in phobos like the 'forEacher'? What is the best strategy for something like that?

do you mean refRange? http://dlang.org/phobos/std_range.html#.refRange

On Saturday, 24 August 2013 at 19:51:14 UTC, David wrote:
> do you mean refRange?
> http://dlang.org/phobos/std_range.html#.refRange

Exactly, thank you!
I've missed it as it is not listed in the tables of the range documentation, like the others, but only in the top-index...

- Paolo Invernizzi

On Sat, Aug 24, 2013 at 10:02:56PM +0200, Paolo Invernizzi wrote:
> On Saturday, 24 August 2013 at 19:51:14 UTC, David wrote:
> >do you mean refRange? http://dlang.org/phobos/std_range.html#.refRange
> 
> Exactly, thank you!
> I've missed it as it is not listed in the tables of the range
> documentation, like the others, but only in the top-index...
[...]

That would be a documentation bug. Please file a bug on http://d.puremagic.com/issues.


T

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On Saturday, 24 August 2013 at 20:24:47 UTC, H. S. Teoh wrote:
> On Sat, Aug 24, 2013 at 10:02:56PM +0200, Paolo Invernizzi wrote:
>> 
>> I've missed it as it is not listed in the tables of the range
>> documentation, like the others, but only in the top-index...
>
> That would be a documentation bug. Please file a bug on
> http://d.puremagic.com/issues.
>

Done: http://d.puremagic.com/issues/show_bug.cgi?id=10885

- Paolo Invernizzi