How to best do fuzzy comparison for floats

[define-private-public]

I was porting an algorithm from C++ over to use Halide. At some point in the algorithm, there was this

float f = //...;
//...
if (f == 0.0) {
//...

I know that is can be a little dangerous to compare floats to exact numbers, which is why you should do fuzzy comparison. Is there a recommended way to do this in Halide?

[abadams]

There's no Halide-specific way to handle this. The idioms are similar to C/C++. Depending on what kind of error I'm being robust to, I usually do something like abs(f) < 0.001f