BASIC "sgn" function equivalent

[Antonio]

On Thursday, 28 July 2022 at 12:02:54 UTC, pascal111 wrote:
> I'm making an equivalent of "sgn" function of BASIC language, 
> and I used "(T)" in its definition, but the function can 
> receive wrong data by passing string data to it, how we can 
> solve it?


Use isFloating!T and isIntegral!T traits.

The standard library **sng** function is a good example:

https://dlang.org/library/std/math/traits/sgn.html