boost/qvm/mat_traits.hpp

0001 #ifndef BOOST_QVM_TRAITS_HPP_INCLUDED
0002 #define BOOST_QVM_TRAITS_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/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 M>
0015 struct
0016 mat_traits
0017     {
0018     static int const rows=0;
0019     static int const cols=0;
0020     typedef void scalar_type;
0021     };
0022
0023 template <class T>
0024 struct
0025 is_mat
0026     {
0027     static bool const value = is_scalar<typename mat_traits<T>::scalar_type>::value && mat_traits<T>::rows>0 && mat_traits<T>::cols>0;
0028     };
0029
0030 namespace
0031 qvm_detail
0032     {
0033     template <class T, T>
0034     struct
0035     mtr_dispatch_yes
0036         {
0037         char x, y;
0038         };
0039     }
0040
0041 template <class T>
0042 class
0043 mat_write_element_ref
0044     {
0045     template <class U>
0046     static qvm_detail::mtr_dispatch_yes<typename mat_traits<U>::scalar_type & (*)( U & ), &mat_traits<U>::template write_element<0,0> > check(int);
0047
0048     template <class>
0049     static char check(long);
0050
0051     public:
0052
0053     static bool const value = sizeof(check<T>(0)) > 1;
0054     };
0055
0056 template <int R, int C, class M>
0057 BOOST_QVM_CONSTEXPR BOOST_QVM_INLINE_CRITICAL
0058 typename enable_if_c<
0059     mat_write_element_ref<M>::value,
0060     void>::type
0061 write_mat_element( M & m, typename mat_traits<M>::scalar_type s )
0062     {
0063     mat_traits<M>::template write_element<R,C>(m) = s;
0064     }
0065
0066 template <int R, int C, class M>
0067 BOOST_QVM_CONSTEXPR BOOST_QVM_INLINE_CRITICAL
0068 typename enable_if_c<
0069     !mat_write_element_ref<M>::value,
0070     void>::type
0071 write_mat_element( M & m, typename mat_traits<M>::scalar_type s )
0072     {
0073     mat_traits<M>::template write_element<R,C>(m, s);
0074     }
0075
0076 template <class M>
0077 BOOST_QVM_CONSTEXPR BOOST_QVM_INLINE_CRITICAL
0078 typename enable_if_c<
0079     mat_write_element_ref<M>::value,
0080     void>::type
0081 write_mat_element_idx( int r, int c, M & m, typename mat_traits<M>::scalar_type s )
0082     {
0083     mat_traits<M>::write_element_idx(r, c, m) = s;
0084     }
0085
0086 template <class M>
0087 BOOST_QVM_CONSTEXPR BOOST_QVM_INLINE_CRITICAL
0088 typename enable_if_c<
0089     !mat_write_element_ref<M>::value,
0090     void>::type
0091 write_mat_element_idx( int r, int c, M & m, typename mat_traits<M>::scalar_type s )
0092     {
0093     mat_traits<M>::write_element_idx(r, c, m, s);
0094     }
0095
0096 } }
0097
0098 #endif