Dne 10.11.2016 v 17:41 Charles Hixson via Digitalmars-d-learn napsal(a):

> The line:
>
> assert    (isnan (c.curActivation), "cell has unexpected curActivation: %s".format(c.curActivation));
>
> throws the exception:
>
> core.exception.AssertError@cell.d(285): cell has unexpected curActivation: nan
>
> and I've looked at it backwards and forwards and don't understand why.  It's *supposed* to be nan, and the assert message reports that it is, but it should pass the assert test, not throw an assertion.  What am I doing wrong?
You need to use https://dlang.org/library/std/math/is_nan.html