[Core] Overload Eigen::Ref to comply with Numpy row-major

CMakeLists.txt

@@ -103,6 +103,7 @@ SET(HEADERS
   registration.hpp
   angle-axis.hpp
   quaternion.hpp
+  ref.hpp
 )
 
 MAKE_DIRECTORY("${${PROJECT_NAME}_BINARY_DIR}/include/eigenpy")

src/ref.hpp

+/*
+ * Copyright 2018, Justin Carpentier <jcarpent@laas.fr>, LAAS-CNRS
+ *
+ * This file is part of eigenpy.
+ * eigenpy is free software: you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public License
+ * as published by the Free Software Foundation, either version 3 of
+ * the License, or (at your option) any later version.
+ * eigenpy is distributed in the hope that it will be
+ * useful, but WITHOUT ANY WARRANTY; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.  You should
+ * have received a copy of the GNU Lesser General Public License along
+ * with eigenpy.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __eigenpy_ref_hpp__
+#define __eigenpy_ref_hpp__
+
+#include "eigenpy/fwd.hpp"
+
+namespace eigenpy
+{
+  template<typename MatType, int IsVectorAtCompileTime = MatType::IsVectorAtCompileTime>
+  struct StrideType
+  {
+    typedef Eigen::Stride<Eigen::Dynamic,Eigen::Dynamic> type;
+  };
+  
+  template<typename MatType>
+  struct StrideType<MatType,1>
+  {
+    typedef Eigen::InnerStride<Eigen::Dynamic> type;
+  };
+  
+  template<typename PlainObjectType>
+  struct Ref : Eigen::Ref<PlainObjectType,EIGENPY_DEFAULT_ALIGNMENT_VALUE,typename StrideType<PlainObjectType>::type>
+  {
+  public:
+    typedef Eigen::Ref<PlainObjectType,EIGENPY_DEFAULT_ALIGNMENT_VALUE,typename StrideType<PlainObjectType>::type> Base;
+    
+  private:
+    typedef Eigen::internal::traits<Base> Traits;
+    template<typename Derived>
+    EIGEN_DEVICE_FUNC inline Ref(const Eigen::PlainObjectBase<Derived>& expr,
+                                 typename Eigen::internal::enable_if<bool(Traits::template match<Derived>::MatchAtCompileTime),Derived>::type* = 0);
+    
+  public:
+    
+    typedef typename Eigen::internal::traits<Base>::Scalar Scalar; /*!< \brief Numeric type, e.g. float, double, int or std::complex<float>. */ \
+    typedef typename Eigen::NumTraits<Scalar>::Real RealScalar; /*!< \brief The underlying numeric type for composed scalar types. \details In cases where Scalar is e.g. std::complex<T>, T were corresponding to RealScalar. */ \
+    typedef typename Base::CoeffReturnType CoeffReturnType; /*!< \brief The return type for coefficient access. \details Depending on whether the object allows direct coefficient access (e.g. for a MatrixXd), this type is either 'const Scalar&' or simply 'Scalar' for objects that do not allow direct coefficient access. */ \
+    typedef typename Eigen::internal::ref_selector<Base>::type Nested; \
+    typedef typename Eigen::internal::traits<Base>::StorageKind StorageKind; \
+    typedef typename Eigen::internal::traits<Base>::StorageIndex StorageIndex; \
+    enum { RowsAtCompileTime = Eigen::internal::traits<Base>::RowsAtCompileTime, \
+      ColsAtCompileTime = Eigen::internal::traits<Base>::ColsAtCompileTime, \
+      Flags = Eigen::internal::traits<Base>::Flags, \
+      SizeAtCompileTime = Base::SizeAtCompileTime, \
+      MaxSizeAtCompileTime = Base::MaxSizeAtCompileTime, \
+      IsVectorAtCompileTime = Base::IsVectorAtCompileTime }; \
+    using Base::derived; \
+    using Base::const_cast_derived;
+    typedef typename Base::PacketScalar PacketScalar;
+    
+    template<typename Derived>
+    EIGEN_DEVICE_FUNC inline Ref(Eigen::PlainObjectBase<Derived>& expr,
+                                 typename Eigen::internal::enable_if<bool(Traits::template match<Derived>::MatchAtCompileTime),Derived>::type* = 0)
+    : Base(expr.derived())
+    {}
+    
+    template<typename Derived>
+    EIGEN_DEVICE_FUNC inline Ref(const Eigen::DenseBase<Derived>& expr,
+                                 typename Eigen::internal::enable_if<bool(Traits::template match<Derived>::MatchAtCompileTime),Derived>::type* = 0)
+    : Base(expr.derived())
+    {}
+    
+#if EIGEN_COMP_MSVC_STRICT && (EIGEN_COMP_MSVC < 1900 ||  defined(__CUDACC_VER__)) // for older MSVC versions, as well as 1900 && CUDA 8, using the base operator is sufficient (cf Bugs 1000, 1324)
+    using Base::operator =;
+#elif EIGEN_COMP_CLANG // workaround clang bug (see http://forum.kde.org/viewtopic.php?f=74&t=102653)
+    using Base::operator =; \
+    EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE Ref& operator=(const Ref& other) { Base::operator=(other); return *this; } \
+    template <typename OtherDerived> \
+    EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE Ref& operator=(const Eigen::DenseBase<OtherDerived>& other) { Base::operator=(other.derived()); return *this; }
+#else
+    using Base::operator =; \
+    EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE Ref& operator=(const Ref& other) \
+    { \
+      Base::operator=(other); \
+      return *this; \
+    }
+#endif
+    
+  }; // struct Ref<PlainObjectType>
+}
+
+#endif // ifndef __eigenpy_ref_hpp__