long double for boost::qvm::normalize gives error during compilation

[prater27]

I am trying to compile a project (Qt5creator, Ubuntu 18.04LTS) where I use boost and qvm library. When using long double for the normalize template, I am getting a compilation error:

/usr/local/include/boost/qvm/gen/vec_operations3.hpp:584: error: undefined reference to `long double boost::qvm::sqrt(long double)'

It does not happen if I give for example double or float. This code should reproduce the error: int main(void){ boost::qvm::vec<long double,3> vector={10,20,30}; boost::qvm:: normalize(vector); return 0; }

Qt5Creator pops-up this part of the code:

  sfinae
        {
        using ::boost::qvm::normalized;
        }

    template <class A>
    BOOST_QVM_INLINE_OPERATIONS
    typename enable_if_c<
        vec_traits<A>::dim==3,
        void>::type
    normalize( A & a )
        {
        typedef typename vec_traits<A>::scalar_type T;
        T const a0=vec_traits<A>::template read_element<0>(a);
        T const a1=vec_traits<A>::template read_element<1>(a);
        T const a2=vec_traits<A>::template read_element<2>(a);
        T const m2=a0*a0+a1*a1+a2*a2;
        if( m2==scalar_traits<typename vec_traits<A>::scalar_type>::value(0) )
            BOOST_QVM_THROW_EXCEPTION(zero_magnitude_error());
        T const rm=scalar_traits<T>::value(1)/sqrt<T>(m2);
        vec_traits<A>::template write_element<0>(a)*=rm;
        vec_traits<A>::template write_element<1>(a)*=rm;
        vec_traits<A>::template write_element<2>(a)*=rm;
        }

Thanks in advance

[zajo]

The boost::qvm namespace contains function templates (with the main template left undefined), and specializations calling the matching C function from , e.g.

template T acos( T ); template <> float acos( float x ) { return ::acosf(x); } template <> double acos( double x ) { return ::acos(x); }

Specializations for long double were not provided. This is now fixed in develop, to be merged into master pending Travis CI.

Thanks for pointing this out.

[zajo]

This is now merged in master, will get released with 1.73.0.

[prater27]

Great! Thanks