boost/qvm/quat_traits.hpp

0001 #ifndef BOOST_QVM_QUAT_TRAITS
0002 #define BOOST_QVM_QUAT_TRAITS
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/is_scalar.hpp>
0009 #include <boost/qvm/enable_if.hpp>
0010 #include <boost/qvm/config.hpp>
0011
0012 namespace boost { namespace qvm {
0013
0014 template <class Q>
0015 struct
0016 quat_traits
0017     {
0018     typedef void scalar_type;
0019     };
0020
0021 template <class T>
0022 struct
0023 is_quat
0024     {
0025     static bool const value = is_scalar<typename quat_traits<T>::scalar_type>::value;
0026     };
0027
0028 namespace
0029 qvm_detail
0030     {
0031     template <class T, T>
0032     struct
0033     qtr_dispatch_yes
0034         {
0035         char x, y;
0036         };
0037     }
0038
0039 template <class T>
0040 class
0041 quat_write_element_ref
0042     {
0043     template <class U>
0044     static qvm_detail::qtr_dispatch_yes<typename quat_traits<U>::scalar_type & (*)( U & ), &quat_traits<U>::template write_element<0> > check(int);
0045
0046     template <class>
0047     static char check(long);
0048
0049     public:
0050
0051     static bool const value = sizeof(check<T>(0)) > 1;
0052     };
0053
0054 template <int I, class Q>
0055 BOOST_QVM_CONSTEXPR BOOST_QVM_INLINE_CRITICAL
0056 typename enable_if_c<
0057     quat_write_element_ref<Q>::value,
0058     void>::type
0059 write_quat_element( Q & q, typename quat_traits<Q>::scalar_type s )
0060     {
0061     quat_traits<Q>::template write_element<I>(q) = s;
0062     }
0063
0064 template <int I, class Q>
0065 BOOST_QVM_CONSTEXPR BOOST_QVM_INLINE_CRITICAL
0066 typename enable_if_c<
0067     !quat_write_element_ref<Q>::value,
0068     void>::type
0069 write_quat_element( Q & q, typename quat_traits<Q>::scalar_type s )
0070     {
0071     quat_traits<Q>::template write_element<I>(q, s);
0072     }
0073
0074 template <class Q>
0075 BOOST_QVM_CONSTEXPR BOOST_QVM_INLINE_CRITICAL
0076 typename enable_if_c<
0077     quat_write_element_ref<Q>::value,
0078     void>::type
0079 write_quat_element_idx( int i, Q & q, typename quat_traits<Q>::scalar_type s )
0080     {
0081     quat_traits<Q>::write_element_idx(i, q) = s;
0082     }
0083
0084 template <class Q>
0085 BOOST_QVM_CONSTEXPR BOOST_QVM_INLINE_CRITICAL
0086 typename enable_if_c<
0087     !quat_write_element_ref<Q>::value,
0088     void>::type
0089 write_vec_element_idx( int i, Q & q, typename quat_traits<Q>::scalar_type s )
0090     {
0091     quat_traits<Q>::write_element_idx(i, q, s);
0092     }
0093
0094 } }
0095
0096 #endif