[Issue 7356] New: Implement KeyType, ValueType for hashes in std.traits

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=7356

           Summary: Implement KeyType, ValueType for hashes in std.traits
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: Phobos
        AssignedTo: nobody at puremagic.com
        ReportedBy: andrej.mitrovich at gmail.com


--- Comment #0 from Andrej Mitrovic <andrej.mitrovich at gmail.com> 2012-01-23 22:50:34 PST ---
I've had a use-case for these but they were not in std.traits, so here's an
implementation:

import std.traits;

template KeyType(AA)
   if (isAssociativeArray!AA)
{
   static if (is(AA V : V[K], K))
   {
       alias K KeyType;
   }
}

template ValueType(AA)
   if (isAssociativeArray!AA)
{
   static if (is(AA V : V[U], U))
   {
       alias V ValueType;
   }
}

If I get an OK I can make a pull for this (with documentation).

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