Is std::equal_to reliable for float types?

Question

To be more exact, does std::equal_to<float>()(float a,float b) or std::equal_to<double>()(double a,double b) does the somewhat better float equality like abs(diff) < EPSILON or just a==b?

Answer 1

std::equal_to uses == to perform the comparison. If you want to compare with a tolerance, you'll have to write that yourself. (Or use a library.)