#ifndef BOOST_QVM_TEST_QVM_QUATERNION_HPP_INCLUDED
#define BOOST_QVM_TEST_QVM_QUATERNION_HPP_INCLUDED

// Copyright 2008-2024 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)

#if defined(BOOST_QVM_TEST_SINGLE_HEADER) && !defined(BOOST_QVM_TEST_SINGLE_HEADER)
#   define BOOST_QVM_TEST_REF_WRITE_ELEMENT
#endif

#include <boost/qvm/quat_traits_defaults.hpp>
#include <boost/qvm/deduce_quat.hpp>
#include <boost/qvm/assert.hpp>
#include "test_qvm.hpp"

namespace
test_qvm
    {
    template <class Tag,class T=float>
    struct
    quaternion
        {
        T a[4];
        mutable T b[4];

        explicit
        quaternion( T start=T(0), T step=T(0) )
            {
            for( int i=0; i!=4; ++i,start+=step )
                a[i]=b[i]=start;
            }
        };

    template <class Tag1,class T1,class Tag2,class T2>
    void
    dump_ab( quaternion<Tag1,T1> const & a, quaternion<Tag2,T2> const & b )
        {
        detail::dump_ab(a.a,b.a);
        }
    }

namespace boost { namespace qvm {

#ifdef BOOST_QVM_TEST_REF_WRITE_ELEMENT

template <class Tag,class T>
struct
quat_traits< test_qvm::quaternion<Tag,T> >:
    quat_traits_defaults<test_qvm::quaternion<Tag,T>,T>
    {
    typedef quat_traits_defaults<test_qvm::quaternion<Tag,T>,T> base;

    template <int I>
    static
    typename base::scalar_type &
    write_element( typename base::quat_type & m )
        {
        BOOST_QVM_STATIC_ASSERT(I>=0);
        BOOST_QVM_STATIC_ASSERT(I<4);
        return m.a[I];
        }
    };

#else

template <class Tag,class T>
struct
quat_traits< test_qvm::quaternion<Tag,T> >
    {
    typedef test_qvm::quaternion<Tag,T> this_quaternion;
    typedef T scalar_type;

    template <int I>
    static
    T
    read_element( this_quaternion const & v )
        {
        BOOST_QVM_STATIC_ASSERT(I>=0);
        BOOST_QVM_STATIC_ASSERT(I<4);
        return v.a[I];
        }

    template <int I>
    static
    void
    write_element( this_quaternion & v, T s )
        {
        BOOST_QVM_STATIC_ASSERT(I>=0);
        BOOST_QVM_STATIC_ASSERT(I<4);
        v.a[I] = s;
        }

    static
    T
    read_element_idx( int i, this_quaternion const & v )
        {
        BOOST_QVM_ASSERT(i>=0);
        BOOST_QVM_ASSERT(i<4);
        return v.a[i];
        }

    static
    void
    write_element_idx( int i, this_quaternion & v, T s )
        {
        BOOST_QVM_ASSERT(i>=0);
        BOOST_QVM_ASSERT(i<4);
        v.a[i] = s;
        }
    };

#endif

    template <class Tag,class T>
    struct
    deduce_quat2<test_qvm::quaternion<Tag,T>,test_qvm::quaternion<Tag,T> >
        {
        typedef test_qvm::quaternion<Tag,T> type;
        };

} }

namespace
    {
    struct Q1;
    struct Q2;
    struct Q3;
    }

#endif
