[Issue 9924] Handy enum accessors

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=9924



--- Comment #3 from bearophile_hugs at eml.cc 2013-04-11 18:51:20 PDT ---
If you remove FirstMember and LastMember the whatBeats() function:


    static Choice whatBeats(in Choice ch) /*pure nothrow*/ {
        if (ch == LastMember!Choice)
            return FirstMember!Choice;
        else
            return nextMember(ch);
    }


Becomes:

    static Choice whatBeats(in Choice ch) /*pure nothrow*/ {
        if (ch == EnumMembers!Choice[$ - 1])
            return EnumMembers!Choice[0];
        else
            return nextMember(ch);
    }


It's more noisy, and visually it's a little less easy to tell it's correct.

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