Hi Everybody, in a discussion on comp.std.c++ it was proposed to include into boost some facility to "fuzzy" or, in other words, to "properly" compare floating point numbers. Something like this, for example: template <typename T> struct compare_absolute_error : std::binary_function<T, T, bool> { T eps; compare_absolute_error(T eps_) : eps(eps_) {} bool operator()(T x, T y) const { return abs(x - y) < eps; } }; This kind of operators occurs frequently in algorithms and are sometimes error-prone to write, so having a ready-made and well tested component can certainly be an advantage. Of course, we could (and should) provide a bunch of different comparison algorithms: absolute and relative in the first place, but there may be others. I believe it might be a little but useful addition to the math library. Main questions are: 1) Is there interest for this? 2) What are the comparison algorithms to include? Thanks for your comments. Ganesh