boost/qvm/quat.hpp

0001 #ifndef BOOST_QVM_QUAT_HPP_INCLUDED
0002 #define BOOST_QVM_QUAT_HPP_INCLUDED
0003
0004 // Copyright 2008-2024 Emil Dotchevski and Reverge Studios, Inc.
0005 // Distributed under the Boost Software License, Version 1.0. (See accompanying
0006 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
0007
0008 #include <boost/qvm/detail/quat_assign.hpp>
0009 #include <boost/qvm/assert.hpp>
0010 #include <boost/qvm/static_assert.hpp>
0011
0012 namespace boost { namespace qvm {
0013
0014 template <class T>
0015 struct
0016 quat
0017     {
0018     T a[4];
0019     template <class R
0020 #if __cplusplus >= 201103L
0021         , class = typename enable_if<is_quat<R> >::type
0022 #endif
0023     >
0024     operator R() const
0025         {
0026         R r;
0027         assign(r,*this);
0028         return r;
0029         }
0030     };
0031
0032 template <class Q>
0033 struct quat_traits;
0034
0035 template <class T>
0036 struct
0037 quat_traits< quat<T> >
0038     {
0039     typedef quat<T> this_quaternion;
0040     typedef T scalar_type;
0041
0042     template <int I>
0043     static
0044     BOOST_QVM_CONSTEXPR BOOST_QVM_INLINE_CRITICAL
0045     scalar_type
0046     read_element( this_quaternion const & x )
0047         {
0048         BOOST_QVM_STATIC_ASSERT(I>=0);
0049         BOOST_QVM_STATIC_ASSERT(I<4);
0050         return x.a[I];
0051         }
0052
0053     template <int I>
0054     static
0055     BOOST_QVM_CONSTEXPR BOOST_QVM_INLINE_CRITICAL
0056     scalar_type &
0057     write_element( this_quaternion & x )
0058         {
0059         BOOST_QVM_STATIC_ASSERT(I>=0);
0060         BOOST_QVM_STATIC_ASSERT(I<4);
0061         return x.a[I];
0062         }
0063     };
0064
0065 } }
0066
0067 #endif