[Issue 9868] Hash iteration should support counter variable

[d-bugmail]

http://d.puremagic.com/issues/show_bug.cgi?id=9868


Andrej Mitrovic andrej.mitrov...@gmail.com changed:

   What|Removed |Added

 Status|NEW |RESOLVED
 Resolution||WONTFIX


--- Comment #2 from Andrej Mitrovic andrej.mitrov...@gmail.com 2013-04-07 
04:24:03 PDT ---
Fair enough. Here's a library workaround when it's really needed:


import std.stdio;
import std.traits;

struct Walk(Hash)
if (isAssociativeArray!Hash)
{
Hash hash;

int opApply(int delegate(size_t idx, KeyType!Hash key, ValueType!Hash val)
dg)
{
int result = 0;

size_t idx;
foreach (key, val; hash)
{
result = dg(idx++, key, val);
if (result)
break;
}

return result;
}
}

auto walk(Hash)(Hash hash)
if (isAssociativeArray!Hash)
{
return Walk!Hash(hash);
}

void main()
{
string[string] hash = [f : foo, b : bar];

foreach (i, key, val; hash.walk)
{
writefln(%s %s %s, i, key, val);
}
}


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[Issue 9868] Hash iteration should support counter variable

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http://d.puremagic.com/issues/show_bug.cgi?id=9868


Martin Nowak c...@dawg.eu changed:

   What|Removed |Added

 CC||c...@dawg.eu


--- Comment #1 from Martin Nowak c...@dawg.eu 2013-04-06 20:33:15 PDT ---
The problem is there is no index in an unsorted map.
But using the known counter from array foreach makes it appear as if there was
a relation between i and key/value.
I don't think it's worth the possible confusion.

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