bug #100: add support for explicit scalar to Array conversion (as enable implicit conversion is much more tricky)

Eigen/src/Core/Array.h

@@ -74,6 +74,21 @@ class Array
     {
       return Base::operator=(other);
     }
+    
+    /** Set all the entries to \a value.
+      * \sa DenseBase::setConstant(), DenseBase::fill()
+      */
+    /* This overload is needed because the usage of
+      *   using Base::operator=;
+      * fails on MSVC. Since the code below is working with GCC and MSVC, we skipped
+      * the usage of 'using'. This should be done only for operator=.
+      */
+    EIGEN_DEVICE_FUNC
+    EIGEN_STRONG_INLINE Array& operator=(const Scalar &value)
+    {
+      Base::setConstant(value);
+      return *this;
+    }
 
     /** Copies the value of the expression \a other into \c *this with automatic resizing.
       *
@@ -99,7 +114,7 @@ class Array
     {
       return Base::_set(other);
     }
-
+    
     /** Default constructor.
       *
       * For fixed-size matrices, does nothing.
@@ -144,7 +159,6 @@ class Array
     }
 #endif
 
-
     #ifndef EIGEN_PARSED_BY_DOXYGEN
     template<typename T>
     EIGEN_DEVICE_FUNC