[Issue 9585] New: Implement getPair() for Associative Arrays

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=9585

           Summary: Implement getPair() for Associative Arrays
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: druntime
        AssignedTo: nobody at puremagic.com
        ReportedBy: andrej.mitrovich at gmail.com


--- Comment #0 from Andrej Mitrovic <andrej.mitrovich at gmail.com> 2013-02-24 16:44:21 PST ---
This was requested recently in IRC.

A getPair() function would return a key+val combination from an existing key
(ideally as a struct), e.g.:

void main()
{
    string buffer = "abc def";
    string abc = buffer[0 .. 3];
    bool[string] hash;
    hash[abc] = true;

    auto pair = hash.getPair("abc");  // enhancement
    assert(pair.key is abc);  // L9
    assert(pair.val == true);

    // not the same as:
    alias Tuple!(string, "key", bool, "val") Tup;
    Tup tup;
    tup.key = "abc";
    tup.val = hash["abc"];
    assert(tup.key is abc);  // this would fail
    assert(tup.val == true);
}

Note the importance of line 9, it is an 'is' check, not an equality check.

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