Ticket #13583: repro.cpp

// Demonstration of cmath helper issue

#include <iostream>

#include <boost/units/systems/si.hpp>
#include <boost/units/io.hpp>
#include <boost/units/cmath.hpp>

int main() {
    using namespace boost::units;

    boost::units::quantity<si::wavenumber, float> x, y;

    // This assignment compiles:
    boost::units::quantity<si::wavenumber, float> foo;
    foo = sqrt(x*x + y*y);

    // The identical expression fails as an initialization:
    boost::units::quantity<si::wavenumber, float> bar = sqrt(x*x + y*y);

}