c++ - double or float comparison

I've seen posts like:

What is the most effective way for float and double comparison?

Compare two floats

And many other related posts.

I saw in d3js library, it uses the following comparison:

  return a < b ? -1 : a > b ? 1 : a >= b ? 0 : NaN;

Is it OK to use this in C/C++ to do the comparison of double and float?