[Issue 12173] Optional start value for std.algorithm.sum

[d-bugmail at puremagic.com]

https://d.puremagic.com/issues/show_bug.cgi?id=12173



--- Comment #2 from bearophile_hugs at eml.cc 2014-02-15 06:29:14 PST ---
(In reply to comment #1)
> Doesn't an add outside the sum call do the same?

An add outside the sum doesn't solve the problem with Foo.

Another example:

long[] data = [...];
immutable total = data.sum(0.BigInt);

If the longs are large enough this gives the correct result, unlike summing
with longs.

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