[Issue 4725] std.algorithm.sum()

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=4725



--- Comment #18 from bearophile_hugs at eml.cc 2013-03-13 11:46:47 PDT ---
(In reply to comment #17)
> https://github.com/D-Programming-Language/phobos/pull/1205

In the patch this the code used to sum in the general case:

+    Result seed = 0;
+    return reduce!"a + b"(seed, r);


Beside the idea in Issue 7934 , I suggest to add a "static if" that tests if
the input is an array (or a random access range) and in such case instead of
reduce uses a loop like this:

        for (int i = 2; i < stop; i += 2) {
            total += array[i];
            total2 += array[i + 1];
        }

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