Added thirdparty: boost library

2026-08-15 11:48:09 +00:00 · 2024-01-06 19:55:56 +02:00
parent bf49f439e1
commit bccd1e7051
15683 changed files with 3239840 additions and 0 deletions
@@ -0,0 +1,75 @@
+#ifndef BOOST_QVM_DETAIL_DETERMINANT_IMPL_HPP_INCLUDED
+#define BOOST_QVM_DETAIL_DETERMINANT_IMPL_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/mat_traits_array.hpp>
+#include <boost/qvm/static_assert.hpp>
+
+namespace boost { namespace qvm {
+
+namespace
+qvm_detail
+    {
+    template <int N>
+    struct
+    det_size
+        {
+        };
+
+    template <class M>
+    BOOST_QVM_CONSTEXPR BOOST_QVM_INLINE_TRIVIAL
+    typename mat_traits<M>::scalar_type
+    determinant_impl_( M const & a, det_size<2> )
+        {
+        return
+            mat_traits<M>::template read_element<0,0>(a) * mat_traits<M>::template read_element<1,1>(a) -
+            mat_traits<M>::template read_element<1,0>(a) * mat_traits<M>::template read_element<0,1>(a);
+        }
+
+    template <class M,int N>
+    BOOST_QVM_CONSTEXPR BOOST_QVM_INLINE_RECURSION
+    typename mat_traits<M>::scalar_type
+    determinant_impl_( M const & a, det_size<N> )
+        {
+        typedef typename mat_traits<M>::scalar_type T;
+        T m[N-1][N-1];
+        T det=T(0);
+        for( int j1=0; j1!=N; ++j1 )
+            {
+            for( int i=1; i!=N; ++i )
+                {
+                int j2 = 0;
+                for( int j=0; j!=N; ++j )
+                    {
+                    if( j==j1 )
+                        continue;
+                    m[i-1][j2] = mat_traits<M>::read_element_idx(i,j,a);
+                    ++j2;
+                    }
+                }
+            T d=determinant_impl_(m,det_size<N-1>());
+            if( j1&1 )
+                d=-d;
+            det += mat_traits<M>::read_element_idx(0,j1,a) * d;
+            }
+        return det;
+        }
+
+    template <class M>
+    BOOST_QVM_CONSTEXPR BOOST_QVM_INLINE_TRIVIAL
+    typename mat_traits<M>::scalar_type
+    determinant_impl( M const & a )
+        {
+        BOOST_QVM_STATIC_ASSERT(mat_traits<M>::rows==mat_traits<M>::cols);
+        return determinant_impl_(a,det_size<mat_traits<M>::rows>());
+        }
+    }
+
+} }
+
+#endif