[Issue 13371] std.math.factorial

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=13371

--- Comment #3 from bearophile_hugs at eml.cc ---
(In reply to hsteoh from comment #1)
> auto factorial(T)(in T n) {
>     import std.mathspecial : gamma;
>     return gamma(n+1);
> }

I need exact integral values, so no thanks.

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