id summary reporter owner description type status milestone component version severity resolution keywords cc 13451 is_close_to function does not exist John Friesen Paul A. Bristow "The example code for boost::math::tools::brent_find_minima (Brent_minimise_example.cpp) calls the function is_close_to. This code results in an error (Visual Studio 15.5.5) because the compiler cannot find the function. Neither can I: [[BR]] [[BR]] #include [[BR]] using boost::math::fpc::is_close_to; [[BR]] [[BR]] The following code seems to work: [[BR]] template [[BR]] inline bool [[BR]] is_close_to(FPT left, FPT right, FPT tolerance) [[BR]] { [[BR]] return boost::math::fpc::close_at_tolerance(tolerance) (left, right); [[BR]] } [[BR]]" Bugs closed To Be Determined math Boost 1.66.0 Problem fixed