• Joseph Rushton Wakeling (8/8) May 15 2013 Hi all,
• bearophile (15/20) May 15 2013 See:
• Joseph Rushton Wakeling (8/10) May 15 2013 Feels a bit nasty, and I have the feeling it would probably slow things ...

Joseph Rushton Wakeling <joseph.wakeling webdrake.net> writes:

Hi all,

If I use zip() to collate together one or more ranges, the individual elements
get returned as a Tuple of the corresponding types.

Is there any way to get zip to label those elements, i.e. to return e.g.

	Tuple!(int, "one", float, "two")

instead of

	Tuple!(int, float)

.... ?

"bearophile" <bearophileHUGS lycos.com> writes:

Joseph Rushton Wakeling:

 If I use zip() to collate together one or more ranges, the 
 individual elements
 get returned as a Tuple of the corresponding types.

 Is there any way to get zip to label those elements, i.e. to 
 return e.g.

See:
http://d.puremagic.com/issues/show_bug.cgi?id=8715

I think currently you have to use map!() to replace the tuple. 
Maybe am unsafe map-cast suffices:

import std.stdio, std.range, std.algorithm, std.typecons;

void main() {
     auto r1 = zip(["red", "blue"], [10, 20]);
     r1.writeln;
     alias T2 = Tuple!(string,"col", int,"val");
     r1.map!(r => T2(r[])).writeln;
     r1.map!(r => cast(T2)r).writeln;
}

Bye,
bearophile

Joseph Rushton Wakeling <joseph.wakeling webdrake.net> writes:

On 05/15/2013 08:00 PM, bearophile wrote:
 I think currently you have to use map!() to replace the tuple. Maybe am unsafe
 map-cast suffices:

Feels a bit nasty, and I have the feeling it would probably slow things down ...
? :-(

I like the zipWith idea, though I can't help but wish zip() itself was flexible
enough to allow something like,

	zip(arr1, "one", arr2, "two")

... though I guess that would fall over if you ever wanted to use zip to lock
together two immutable strings.