Add support for plain-array as indices, e.g., mat({1,2,3,4})

3 files changed, 15 insertions, 2 deletions

diff --git a/Eigen/src/Core/ArithmeticSequence.h b/Eigen/src/Core/ArithmeticSequence.h
index 1585c1dbf..bfc586a61 100644
--- a/Eigen/src/Core/ArithmeticSequence.h
+++ b/Eigen/src/Core/ArithmeticSequence.h
@@ -159,6 +159,12 @@ span(FirstType first, SizeType size)  {
 
 namespace internal {
 
+template<typename T>
+Index size(const T& x) { return x.size(); }
+
+template<typename T,std::size_t N>
+Index size(const T (&x) [N]) { return N; }
+
 template<typename T, int XprSize, typename EnableIf = void> struct get_compile_time_size {
   enum { value = Dynamic };
 };
diff --git a/Eigen/src/Core/DenseBase.h b/Eigen/src/Core/DenseBase.h
index f8a6b2625..13aa3854a 100644
--- a/Eigen/src/Core/DenseBase.h
+++ b/Eigen/src/Core/DenseBase.h
@@ -566,6 +566,13 @@ template<typename Derived> class DenseBase
                 derived(), internal::make_indexing(rowIndices,derived().rows()), internal::make_indexing(colIndices,derived().cols()));
     }
 
+    template<typename RowIndicesT, std::size_t RowIndicesN, typename ColIndices>
+    IndexedView<const Derived,const RowIndicesT (&)[RowIndicesN],typename internal::MakeIndexing<ColIndices>::type>
+    operator()(const RowIndicesT (&rowIndices)[RowIndicesN], const ColIndices& colIndices) const {
+      return IndexedView<const Derived,const RowIndicesT (&) [RowIndicesN],typename internal::MakeIndexing<ColIndices>::type>(
+                derived(), rowIndices, internal::make_indexing(colIndices,derived().cols()));
+    }
+
 #define EIGEN_CURRENT_STORAGE_BASE_CLASS Eigen::DenseBase
 #define EIGEN_DOC_BLOCK_ADDONS_NOT_INNER_PANEL
 #define EIGEN_DOC_BLOCK_ADDONS_INNER_PANEL_IF(COND)
diff --git a/Eigen/src/Core/IndexedView.h b/Eigen/src/Core/IndexedView.h
index 26c048584..5ff1c1837 100644
--- a/Eigen/src/Core/IndexedView.h
+++ b/Eigen/src/Core/IndexedView.h
@@ -70,8 +70,8 @@ public:
   IndexedView(XprType& xpr, const T0& rowIndices, const T1& colIndices)
     : m_xpr(xpr), m_rowIndices(rowIndices), m_colIndices(colIndices)
   {}
-  Index rows() const { return m_rowIndices.size(); }
-  Index cols() const { return m_colIndices.size(); }
+  Index rows() const { return internal::size(m_rowIndices); }
+  Index cols() const { return internal::size(m_colIndices); }
 
   /** \returns the nested expression */
   const typename internal::remove_all<XprType>::type&