Given a function that returns a count of items, and another function that returns an item at an index, is there anything built into Phobos that can use them together to build a range?

The two functions are from an external API, eg:

  int getFontCount();
  Item getItemAt(int index);

I was wondering if there was something like a "rangeOf" as illustrated:

  foreach (item; rangeOf!(() => getFontCount(), (i) => getItemAt(i)) {
  }

On 10/22/2018 03:51 PM, John Chapman wrote:
> Given a function that returns a count of items, and another function that returns an item at an index, is there anything built into Phobos that can use them together to build a range?
> 
> The two functions are from an external API, eg:
> 
>    int getFontCount();
>    Item getItemAt(int index);
> 
> I was wondering if there was something like a "rangeOf" as illustrated:
> 
>    foreach (item; rangeOf!(() => getFontCount(), (i) => getItemAt(i)) {
>    }

iota and map:

alias Item = string;

Item[] items = [ "Good font", "Better font" ];

int getFontCount() {
    import std.conv : to;
    return items.length.to!int;
}

Item getItemAt(int index) {
    return items[index];
}

auto allFonts() {
}

auto itemRange() {
    import std.range : iota;
    import std.algorithm : map;
    return iota(getFontCount()).map!(i => getItemAt(i));
}

void main() {
    import std.stdio;
    writeln(itemRange());
}

Ali

On Monday, 22 October 2018 at 23:02:35 UTC, Ali Çehreli wrote:
> iota and map:
>

Thank you. And the funny thing is I used iota earlier today but it didn't occur to me for this!