From 3d200257d73d99a1f37b1cb23ce52b80264ba0d9 Mon Sep 17 00:00:00 2001
From: Gael Guennebaud <g.gael@free.fr>
Date: Tue, 21 Feb 2017 15:57:25 +0100
Subject: Add support for automatic-size deduction in reshaped, e.g.:

mat.reshaped(4,AutoSize); <-> mat.reshaped(4,mat.size()/4);
---
 Eigen/src/plugins/ReshapedMethods.h | 82 ++++++++++++++++++++-----------------
 1 file changed, 45 insertions(+), 37 deletions(-)

(limited to 'Eigen/src/plugins')

diff --git a/Eigen/src/plugins/ReshapedMethods.h b/Eigen/src/plugins/ReshapedMethods.h
index fc7cdcfa7..118841798 100644
--- a/Eigen/src/plugins/ReshapedMethods.h
+++ b/Eigen/src/plugins/ReshapedMethods.h
@@ -28,62 +28,70 @@ template<typename NRowsType, typename NColsType, typename OrderType>
 EIGEN_DEVICE_FUNC
 inline const Reshaped<const Derived,...>
 reshaped(NRowsType nRows, NColsType nCols, OrderType = ColOrder) const;
+
 #else
-template<typename NRowsType, typename NColsType>
-EIGEN_DEVICE_FUNC
-inline Reshaped<Derived,internal::get_fixed_value<NRowsType>::value,internal::get_fixed_value<NColsType>::value>
-reshaped(NRowsType nRows, NColsType nCols)
-{
-  return Reshaped<Derived,internal::get_fixed_value<NRowsType>::value,internal::get_fixed_value<NColsType>::value>(
-            derived(), internal::get_runtime_value(nRows), internal::get_runtime_value(nCols));
-}
 
-template<typename NRowsType, typename NColsType, typename OrderType>
-EIGEN_DEVICE_FUNC
-inline Reshaped<Derived,internal::get_fixed_value<NRowsType>::value,internal::get_fixed_value<NColsType>::value,
-                OrderType::value==AutoOrderValue?Flags&RowMajorBit:OrderType::value>
-reshaped(NRowsType nRows, NColsType nCols, OrderType)
-{
-  return Reshaped<Derived,internal::get_fixed_value<NRowsType>::value,internal::get_fixed_value<NColsType>::value,
-                  OrderType::value==AutoOrderValue?Flags&RowMajorBit:OrderType::value>(
-            derived(), internal::get_runtime_value(nRows), internal::get_runtime_value(nCols));
-}
+// This file is automatically included twice to generate const and non-const versions
 
+#ifndef EIGEN_RESHAPED_METHOD_2ND_PASS
+#define EIGEN_RESHAPED_METHOD_CONST const
+#else
+#define EIGEN_RESHAPED_METHOD_CONST
+#endif
+
+#ifndef EIGEN_RESHAPED_METHOD_2ND_PASS
+
+// This part is included once
+
+#endif
 
 template<typename NRowsType, typename NColsType>
 EIGEN_DEVICE_FUNC
-inline const Reshaped<const Derived,internal::get_fixed_value<NRowsType>::value,internal::get_fixed_value<NColsType>::value>
-reshaped(NRowsType nRows, NColsType nCols) const
+inline Reshaped<EIGEN_RESHAPED_METHOD_CONST Derived,
+                internal::get_compiletime_reshape_size<NRowsType,NColsType,SizeAtCompileTime>::value,
+                internal::get_compiletime_reshape_size<NColsType,NRowsType,SizeAtCompileTime>::value>
+reshaped(NRowsType nRows, NColsType nCols) EIGEN_RESHAPED_METHOD_CONST
 {
-  return Reshaped<const Derived,internal::get_fixed_value<NRowsType>::value,internal::get_fixed_value<NColsType>::value>(
-            derived(), internal::get_runtime_value(nRows), internal::get_runtime_value(nCols));
+  return Reshaped<EIGEN_RESHAPED_METHOD_CONST Derived,
+                  internal::get_compiletime_reshape_size<NRowsType,NColsType,SizeAtCompileTime>::value,
+                  internal::get_compiletime_reshape_size<NColsType,NRowsType,SizeAtCompileTime>::value>
+                (derived(),
+                 internal::get_runtime_reshape_size(nRows,internal::get_runtime_value(nCols),size()),
+                 internal::get_runtime_reshape_size(nCols,internal::get_runtime_value(nRows),size()));
 }
 
 template<typename NRowsType, typename NColsType, typename OrderType>
 EIGEN_DEVICE_FUNC
-inline const Reshaped<const Derived,internal::get_fixed_value<NRowsType>::value,internal::get_fixed_value<NColsType>::value,
-                      OrderType::value==AutoOrderValue?Flags&RowMajorBit:OrderType::value>
-reshaped(NRowsType nRows, NColsType nCols, OrderType) const
+inline Reshaped<EIGEN_RESHAPED_METHOD_CONST Derived,
+                internal::get_compiletime_reshape_size<NRowsType,NColsType,SizeAtCompileTime>::value,
+                internal::get_compiletime_reshape_size<NColsType,NRowsType,SizeAtCompileTime>::value,
+                OrderType::value==AutoOrderValue?Flags&RowMajorBit:OrderType::value>
+reshaped(NRowsType nRows, NColsType nCols, OrderType) EIGEN_RESHAPED_METHOD_CONST
 {
-  return Reshaped<const Derived,internal::get_fixed_value<NRowsType>::value,internal::get_fixed_value<NColsType>::value,
-                  OrderType::value==AutoOrderValue?Flags&RowMajorBit:OrderType::value>(
-            derived(), internal::get_runtime_value(nRows), internal::get_runtime_value(nCols));
+  return Reshaped<EIGEN_RESHAPED_METHOD_CONST Derived,
+                  internal::get_compiletime_reshape_size<NRowsType,NColsType,SizeAtCompileTime>::value,
+                  internal::get_compiletime_reshape_size<NColsType,NRowsType,SizeAtCompileTime>::value,
+                  OrderType::value==AutoOrderValue?Flags&RowMajorBit:OrderType::value>
+                (derived(),
+                 internal::get_runtime_reshape_size(nRows,internal::get_runtime_value(nCols),size()),
+                 internal::get_runtime_reshape_size(nCols,internal::get_runtime_value(nRows),size()));
 }
 
 // Views as linear vectors
 
 EIGEN_DEVICE_FUNC
-inline const Reshaped<Derived,SizeAtCompileTime,1>
-operator()(const Eigen::internal::all_t&)
+inline Reshaped<EIGEN_RESHAPED_METHOD_CONST Derived,SizeAtCompileTime,1>
+operator()(const Eigen::internal::all_t&) EIGEN_RESHAPED_METHOD_CONST
 {
-  return Reshaped<Derived,SizeAtCompileTime,1>(derived(),size(),1);
+  return Reshaped<EIGEN_RESHAPED_METHOD_CONST Derived,SizeAtCompileTime,1>(derived(),size(),1);
 }
 
-EIGEN_DEVICE_FUNC
-inline const Reshaped<const Derived,SizeAtCompileTime,1>
-operator()(const Eigen::internal::all_t&) const
-{
-  return Reshaped<const Derived,SizeAtCompileTime,1>(derived(),size(),1);
-}
+#undef EIGEN_RESHAPED_METHOD_CONST
+
+#ifndef EIGEN_RESHAPED_METHOD_2ND_PASS
+#define EIGEN_RESHAPED_METHOD_2ND_PASS
+#include "ReshapedMethods.h"
+#undef EIGEN_RESHAPED_METHOD_2ND_PASS
+#endif
 
 #endif // EIGEN_PARSED_BY_DOXYGEN
-- 
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