# QVM: Quaternions, Vectors, Matrices

### boost/qvm/vec.hpp

This header defines the struct vec template, which acts as a generic vector type.

### Synopsis:

#include <boost/qvm/vec.hpp>

    namespace boost
    {
        namespace qvm
        {
            template <class T,int Dim>
            struct vec
            {
                T a[Dim];

                template <class R>
                operator R() const
                {
                    R r;
                    assign(r,*this);
                    return r;
                }
            };

            template <class Vector>
            struct vec_traits;

            template <class T,int Dim>
            struct vec_traits< vec<T,Dim> >
            {
                typedef T scalar_type;
                static int const dim=Dim;

                template <int I> static scalar_type read_element( vec<T,Dim> const & x ) { return x.a[I]; }
                template <int I> static scalar_type & write_element( vec<T,Dim> & x ) { return x.a[I]; }

                static scalar_type read_element_idx( int i, vec<T,Dim> const & x ) { return x.a[i]; }
                static scalar_type & write_element_idx( int i, vec<T,Dim> & x ) { return x.a[i]; }
            };
        }
    }

See also: vec