'in' for arrays?

[Derek Parnell]

On Thu, 07 Dec 2006 22:26:15 +0000, Stewart Gordon wrote:

Is this useful to someone?

// -----------------
template ContainsFrom (T)
{
    // Return 'index' if 'element' found in 'array' otherwise return -1
    int ContainsFrom(T[] pArray, T pElement, int pIndex)
    {
        if (pIndex >= 0)
        {
            while (pIndex < pArray.length)
            {
                if (pElement == pArray[pIndex])
                    return pIndex;
                pIndex++;
            }
        }
        return -1; // Not Found
    }
}

template Contains (T)
{
    int Contains(T[] pArray, T pElement)
    {
        return ContainsFrom(pArray,pElement,0);
    }

}

unittest
{

   int[] X;
   X ~= 3;
   X ~= 2;
   X ~= 6;
   X ~= 8;
   X ~= 1;

   assert(X.Contains(8)  == 3);
   assert(X.Contains(3)  == 0);
   assert(X.Contains(-1) == -1);
   assert(X.Contains(99) == -1);
   assert(X.ContainsFrom(8,4)  == -1);
   assert(X.ContainsFrom(8,2)  == 3);


   char[] Y = "qwerty";

   assert(Y.Contains('a') == -1);
   assert(Y.Contains('q') == 0);
   assert(Y.Contains('t') == 4);
   assert(Y.Contains('z') == -1);

}

// -------------


-- 
Derek
(skype: derek.j.parnell)
Melbourne, Australia
"Down with mediocrity!"
8/12/2006 9:52:26 AM