http://d.puremagic.com/issues/show_bug.cgi?id=9119

           Summary: Forward range addition to associative arrays.
           Product: D
           Version: unspecified
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: Phobos
        AssignedTo: nobody@puremagic.com
        ReportedBy: maidenphil@hotmail.com


--- Comment #0 from Phil Lavoie <maidenphil@hotmail.com> 2012-12-06 14:15:25 PST ---
Providing a forward range to associative arrays would allow user to use functionalities like "filter" and make their own (that return intelligent ranges instead of eagerly constructing a result, then returning said result or a range on it). It could be provided as a "range" property and "front" could return an entry struct where entry.key is the key and entry.value is the value.

Example usage:
float[ Item ] itemsCost;
auto cheapItems = itemsCost.range.filter!"a.value < 5"();
foreach( cheap; cheapItems ) {
  sendGiftToEnemy( cheap.key );
}

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bearophile_hugs@eml.cc changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |bearophile_hugs@eml.cc


--- Comment #1 from bearophile_hugs@eml.cc 2012-12-06 17:49:48 PST ---
See Issue 5075

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hsteoh@quickfur.ath.cx changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |pull
                 CC|                            |hsteoh@quickfur.ath.cx


--- Comment #2 from hsteoh@quickfur.ath.cx 2013-08-15 12:23:05 PDT ---
https://github.com/D-Programming-Language/druntime/pull/574

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--- Comment #3 from hsteoh@quickfur.ath.cx 2013-08-15 12:33:54 PDT ---
Using the code in the pull request, this code works:

import std.algorithm;
import std.conv;
import std.stdio: writeln;
void main () {
        int[string] aa;
        aa["a"] = 1;
        aa["b"] = 2;
        aa["c"] = 3;
        writeln(aa.byPair
                .map!((a) => "key=" ~ a.key ~ " value=" ~ to!string(a.value))
                .joiner("\n")
        );
}


The output is:

key=a value=1
key=b value=2
key=c value=3

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