Make MatGeneric::getNbRow/NbCol virtual in order to override them in MatButterfly.

src/faust_linear_operator/CPU/faust_MatButterfly.h

@@ -51,6 +51,9 @@ namespace Faust
 			void init_transpose();
 			void Display() const;
 
+			faust_unsigned_int getNbRow() const { return D1.rows();};
+			faust_unsigned_int getNbCol() const { return D1.cols();};
+
 			void multiply(const FPP* x, FPP* y, size_t size, bool transpose = false);
 			void multiply(const FPP* A, int A_ncols, FPP* C, size_t size, bool transpose = false);
 

src/faust_linear_operator/faust_MatGeneric.h

@@ -90,10 +90,10 @@ namespace Faust
 			void setOp(const char op, faust_unsigned_int& nbRowOp, faust_unsigned_int& nbColOp)const;
 
 			//! \brief return the number of rows of (*this)
-			faust_unsigned_int getNbRow() const {return dim1;}
+			virtual faust_unsigned_int getNbRow() const {return dim1;}
 
 			//! \brief return the number of column of (*this)
-			faust_unsigned_int getNbCol() const {return dim2;}
+			virtual faust_unsigned_int getNbCol() const {return dim2;}
 
 			//! \brief resize (*this)
 			//! \param dim1_ : new number of rows