boost/qvm/quat.hpp

0001 #ifndef BOOST_QVM_QUAT_HPP_INCLUDED
0002 #define BOOST_QVM_QUAT_HPP_INCLUDED
0003
0004 // Copyright 2008-2022 Emil Dotchevski and Reverge Studios, Inc.
0005
0006 // Distributed under the Boost Software License, Version 1.0. (See accompanying
0007 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
0008
0009 #include <boost/qvm/detail/quat_assign.hpp>
0010 #include <boost/qvm/assert.hpp>
0011 #include <boost/qvm/static_assert.hpp>
0012
0013 namespace boost { namespace qvm {
0014
0015 template <class T>
0016 struct
0017 quat
0018     {
0019     T a[4];
0020     template <class R
0021 #if __cplusplus >= 201103L
0022         , class = typename enable_if<is_quat<R> >::type
0023 #endif
0024     >
0025     operator R() const
0026         {
0027         R r;
0028         assign(r,*this);
0029         return r;
0030         }
0031     };
0032
0033 template <class Q>
0034 struct quat_traits;
0035
0036 template <class T>
0037 struct
0038 quat_traits< quat<T> >
0039     {
0040     typedef quat<T> this_quaternion;
0041     typedef T scalar_type;
0042
0043     template <int I>
0044     static
0045     BOOST_QVM_CONSTEXPR BOOST_QVM_INLINE_CRITICAL
0046     scalar_type
0047     read_element( this_quaternion const & x )
0048         {
0049         BOOST_QVM_STATIC_ASSERT(I>=0);
0050         BOOST_QVM_STATIC_ASSERT(I<4);
0051         return x.a[I];
0052         }
0053
0054     template <int I>
0055     static
0056     BOOST_QVM_CONSTEXPR BOOST_QVM_INLINE_CRITICAL
0057     scalar_type &
0058     write_element( this_quaternion & x )
0059         {
0060         BOOST_QVM_STATIC_ASSERT(I>=0);
0061         BOOST_QVM_STATIC_ASSERT(I<4);
0062         return x.a[I];
0063         }
0064     };
0065
0066 } }
0067
0068 #endif