OTS/OTSCPP/Tools/boost/qvm/quat_access.hpp

//Copyright (c) 2008-2016 Emil Dotchevski and Reverge Studios, Inc.

//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_8AC84A2217C411E0A7AF3A1BDFD72085
#define BOOST_QVM_8AC84A2217C411E0A7AF3A1BDFD72085

#include <boost/qvm/inline.hpp>
#include <boost/qvm/quat_traits.hpp>
#include <boost/qvm/deduce_vec.hpp>
#include <boost/qvm/static_assert.hpp>
#include <boost/qvm/enable_if.hpp>

namespace
boost
    {
    namespace
    qvm
        {
        ////////////////////////////////////////////////

        namespace
        qvm_detail
            {
            template <class Q>
            struct
            quat_v_
                {
                template <class R>
                operator R() const
                    {
                    R r;
                    assign(r,*this);
                    return r;
                    }

                private:

                quat_v_( quat_v_ const & );
                quat_v_ const & operator=( quat_v_ const & );
                ~quat_v_();
                };
            }

        template <class V>
        struct vec_traits;

        template <class Q>
        struct
        vec_traits< qvm_detail::quat_v_<Q> >
            {
            typedef qvm_detail::quat_v_<Q> this_vector;
            typedef typename quat_traits<Q>::scalar_type scalar_type;
            static int const dim=3;

            template <int I>
            BOOST_QVM_INLINE_CRITICAL
            static
            scalar_type
            read_element( this_vector const & q )
                {
                BOOST_QVM_STATIC_ASSERT(I>=0);
                BOOST_QVM_STATIC_ASSERT(I<dim);
                return quat_traits<Q>::template read_element<I+1>( reinterpret_cast<Q const &>(q) );
                }

            template <int I>
            BOOST_QVM_INLINE_CRITICAL
            static
            scalar_type &
            write_element( this_vector & q )
                {
                BOOST_QVM_STATIC_ASSERT(I>=0);
                BOOST_QVM_STATIC_ASSERT(I<dim);
                return quat_traits<Q>::template write_element<I+1>( reinterpret_cast<Q &>(q) );
                }
            };

        template <class Q,int D>
        struct
        deduce_vec<qvm_detail::quat_v_<Q>,D>
            {
            typedef vec<typename quat_traits<Q>::scalar_type,D> type;
            };

        template <class Q,int D>
        struct
        deduce_vec2<qvm_detail::quat_v_<Q>,qvm_detail::quat_v_<Q>,D>
            {
            typedef vec<typename quat_traits<Q>::scalar_type,D> type;
            };

        template <class Q>
        BOOST_QVM_INLINE_TRIVIAL
        typename enable_if_c<
            is_quat<Q>::value,
            qvm_detail::quat_v_<Q> const &>::type
        V( Q const & a )
            {
            return reinterpret_cast<qvm_detail::quat_v_<Q> const &>(a);
            }

        template <class Q>
        BOOST_QVM_INLINE_TRIVIAL
        typename enable_if_c<
            is_quat<Q>::value,
            qvm_detail::quat_v_<Q> &>::type
        V( Q & a )
            {
            return reinterpret_cast<qvm_detail::quat_v_<Q> &>(a);
            }

        template <class Q> BOOST_QVM_INLINE_TRIVIAL typename enable_if_c<is_quat<Q>::value,typename quat_traits<Q>::scalar_type>::type S( Q const & a ) { return quat_traits<Q>::template read_element<0>(a); }
        template <class Q> BOOST_QVM_INLINE_TRIVIAL typename enable_if_c<is_quat<Q>::value,typename quat_traits<Q>::scalar_type>::type X( Q const & a ) { return quat_traits<Q>::template read_element<1>(a); }
        template <class Q> BOOST_QVM_INLINE_TRIVIAL typename enable_if_c<is_quat<Q>::value,typename quat_traits<Q>::scalar_type>::type Y( Q const & a ) { return quat_traits<Q>::template read_element<2>(a); }
        template <class Q> BOOST_QVM_INLINE_TRIVIAL typename enable_if_c<is_quat<Q>::value,typename quat_traits<Q>::scalar_type>::type Z( Q const & a ) { return quat_traits<Q>::template read_element<3>(a); }

        template <class Q> BOOST_QVM_INLINE_TRIVIAL typename enable_if_c<is_quat<Q>::value,typename quat_traits<Q>::scalar_type &>::type S( Q & a ) { return quat_traits<Q>::template write_element<0>(a); }
        template <class Q> BOOST_QVM_INLINE_TRIVIAL typename enable_if_c<is_quat<Q>::value,typename quat_traits<Q>::scalar_type &>::type X( Q & a ) { return quat_traits<Q>::template write_element<1>(a); }
        template <class Q> BOOST_QVM_INLINE_TRIVIAL typename enable_if_c<is_quat<Q>::value,typename quat_traits<Q>::scalar_type &>::type Y( Q & a ) { return quat_traits<Q>::template write_element<2>(a); }
        template <class Q> BOOST_QVM_INLINE_TRIVIAL typename enable_if_c<is_quat<Q>::value,typename quat_traits<Q>::scalar_type &>::type Z( Q & a ) { return quat_traits<Q>::template write_element<3>(a); }

        ////////////////////////////////////////////////
        }
    }

#endif