Generate next largest or smallest representable floating point number without bit twiddling

Question

Given an arbitrary finite floating point number, is there a way to determine what the next representable floating point number? For example, given 1.0f, by definition the ne

Answer 1

In C++11, you use std::nextafter(). Lacking that, on a C99 system, you use nextafterf, nextafter, or nextafterl from the C math library (for types float, double, and long double, respectively).