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 Hu Chunming
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#ifndef BOOST_QVM_QUAT_ACCESS_HPP_INCLUDED
#define BOOST_QVM_QUAT_ACCESS_HPP_INCLUDED
// Copyright 2008-2022 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)
#include <boost/qvm/config.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 {
template <class Q> BOOST_QVM_CONSTEXPR 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_CONSTEXPR 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_CONSTEXPR 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_CONSTEXPR 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); }
namespace
qvm_detail
{
template <int I,class Q>
struct
q_element_access
{
BOOST_QVM_CONSTEXPR BOOST_QVM_INLINE_CRITICAL
void
operator=( typename quat_traits<Q>::scalar_type s )
{
quat_traits<Q>::template write_element<I>(*reinterpret_cast<Q *>(this), s);
}
BOOST_QVM_CONSTEXPR BOOST_QVM_INLINE_CRITICAL
operator typename vec_traits<Q>::scalar_type() const
{
return quat_traits<Q>::template read_element<I>(*reinterpret_cast<Q const *>(this));
}
};
template <class Q>
struct
quat_v_
{
template <class R
#if __cplusplus >= 201103L
, class = typename enable_if<is_vec<R> >::type
#endif
>
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 Q,bool WriteElementRef=quat_write_element_ref<Q>::value>
struct quat_v_write_traits;
template <class Q>
struct
quat_v_write_traits<Q,true>
{
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_CONSTEXPR 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>
struct
quat_v_write_traits<Q,false>
{
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_CONSTEXPR BOOST_QVM_INLINE_CRITICAL
static
void
write_element( this_vector & q, scalar_type s )
{
BOOST_QVM_STATIC_ASSERT(I>=0);
BOOST_QVM_STATIC_ASSERT(I<dim);
quat_traits<Q>::template write_element<I+1>( reinterpret_cast<Q &>(q), s );
}
};
}
template <class V>
struct vec_traits;
template <class Q>
struct
vec_traits< qvm_detail::quat_v_<Q> >:
qvm_detail::quat_v_write_traits<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_CONSTEXPR 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 <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_CONSTEXPR 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_CONSTEXPR 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_CONSTEXPR BOOST_QVM_INLINE_TRIVIAL typename enable_if_c<is_quat<Q>::value && quat_write_element_ref<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_CONSTEXPR BOOST_QVM_INLINE_TRIVIAL typename enable_if_c<is_quat<Q>::value && quat_write_element_ref<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_CONSTEXPR BOOST_QVM_INLINE_TRIVIAL typename enable_if_c<is_quat<Q>::value && quat_write_element_ref<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_CONSTEXPR BOOST_QVM_INLINE_TRIVIAL typename enable_if_c<is_quat<Q>::value && quat_write_element_ref<Q>::value,typename quat_traits<Q>::scalar_type &>::type Z( Q & a ) { return quat_traits<Q>::template write_element<3>(a); }
template <class Q> BOOST_QVM_CONSTEXPR BOOST_QVM_INLINE_TRIVIAL typename enable_if_c<is_quat<Q>::value && !quat_write_element_ref<Q>::value,qvm_detail::q_element_access<0,Q> &>::type S( Q & a ) { return *reinterpret_cast<qvm_detail::q_element_access<0, Q> *>(&a); }
template <class Q> BOOST_QVM_CONSTEXPR BOOST_QVM_INLINE_TRIVIAL typename enable_if_c<is_quat<Q>::value && !quat_write_element_ref<Q>::value,qvm_detail::q_element_access<1,Q> &>::type X( Q & a ) { return *reinterpret_cast<qvm_detail::q_element_access<1, Q> *>(&a); }
template <class Q> BOOST_QVM_CONSTEXPR BOOST_QVM_INLINE_TRIVIAL typename enable_if_c<is_quat<Q>::value && !quat_write_element_ref<Q>::value,qvm_detail::q_element_access<2,Q> &>::type Y( Q & a ) { return *reinterpret_cast<qvm_detail::q_element_access<2, Q> *>(&a); }
template <class Q> BOOST_QVM_CONSTEXPR BOOST_QVM_INLINE_TRIVIAL typename enable_if_c<is_quat<Q>::value && !quat_write_element_ref<Q>::value,qvm_detail::q_element_access<3,Q> &>::type Z( Q & a ) { return *reinterpret_cast<qvm_detail::q_element_access<3, Q> *>(&a); }
} }
#endif
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