Re: Why D is annoying =P

[H. S. Teoh]

On Wed, Oct 24, 2012 at 10:16:27PM +0200, Mehrdad wrote:
[...]
> struct Set(T)
> {
>       int[T] dict;
>       hash_t toHash() const
>       {
>               typeof(return) r = 0;
>               foreach (item; this.dict.keys)
>               {
>                       ???       // what should be here?
>               }
>               return r;
>       }
> }

Try this:

        hash_t toHash() const
        {
                hash_t h = 0;
                foreach (item; this.dict.keys)
                {
                        // We use a commutative operation here (+) so
                        // that the order of keys don't matter.
                        h += hashOf(&item, item.sizeof);
                }
                return h;
        }


T

-- 
What do you get if you drop a piano down a mineshaft? A flat minor.