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Editing: vec_traits_defaults.hpp

//Distributed under the Boost Software License, Version 1.0. (See accompanying
//file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)

#ifndef BOOST_QVM_DFFD61ACC72311E6955FFF1F07624D53
#define BOOST_QVM_DFFD61ACC72311E6955FFF1F07624D53

#include <boost/qvm/inline.hpp>
#include <boost/qvm/assert.hpp>

namespace
boost
    {
    namespace
    qvm
        {
        template <class>
        struct vec_traits;

namespace
        qvm_detail
            {
            template <int I,int N>
            struct
            vector_w
                {
                template <class A>
                static
                BOOST_QVM_INLINE_CRITICAL
                typename vec_traits<A>::scalar_type &
                write_element_idx( int i, A & a )
                    {
                    return I==i?
                        vec_traits<A>::template write_element<I>(a) :
                        vector_w<I+1,N>::write_element_idx(i,a);
                    }
                };

template <int N>
            struct
            vector_w<N,N>
                {
                template <class A>
                static
                BOOST_QVM_INLINE_TRIVIAL
                typename vec_traits<A>::scalar_type &
                write_element_idx( int, A & a )
                    {
                    BOOST_QVM_ASSERT(0);
                    return vec_traits<A>::template write_element<0>(a);
                    }
                };
            }

template <class VecType,class ScalarType,int Dim>
        struct
        vec_traits_defaults
            {
            typedef VecType vec_type;
            typedef ScalarType scalar_type;
            static int const dim=Dim;

template <int I>
            static
            BOOST_QVM_INLINE_CRITICAL
            scalar_type
            read_element( vec_type const & x )
                {
                return vec_traits<vec_type>::template write_element<I>(const_cast<vec_type &>(x));
                }

static
            BOOST_QVM_INLINE_CRITICAL
            scalar_type
            read_element_idx( int i, vec_type const & x )
                {
                return vec_traits<vec_type>::write_element_idx(i,const_cast<vec_type &>(x));
                }

protected:

static
            BOOST_QVM_INLINE_TRIVIAL
            scalar_type &
            write_element_idx( int i, vec_type & m )
                {
                return qvm_detail::vector_w<0,vec_traits<vec_type>::dim>::write_element_idx(i,m);
                }
            };
        }
    }

#endif

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