[ROOT] example in the code

From: Nicolas Produit (Nicolas.Produit@obs.unige.ch)
Date: Tue Feb 26 2002 - 17:20:37 MET 

Hi,
I try to figure out how to use use TMatrixD Apply method.
Looking at the example in the TMatrixD code (and making some obvious
corrections like TElementActionD rather then TElementAction)
I get the following piece of code:



#include "TMatrixD.h"
void foo(TMatrixD &m, TMatrixD &m1)
{
   typedef  double (*dfunc_t)(double);
   class ApplyFunction : public TElementActionD {
     dfunc_t fFunc;
     void Operation(Double_t &element) { element=fFunc(element); }
   public:
     ApplyFunction(dfunc_t func):fFunc(func) {}
   };
   m.Apply(ApplyFunction(TMath::Sin));
   m1.Apply(ApplyFunction(TMath::Cos));
}

But trying to compile it I got:

g++ -c -Wall -g -D_REENTRANT -I/isdc/sw/root/3.02.07/gcc/2.95.2/include 
bla.C
bla.C: In function `void foo(TMatrixD &, TMatrixD &)':
bla.C:11: initialization of non-const reference type `class 
TElementActionD &'
bla.C:11: from rvalue of type `foo(TMatrixD &, TMatrixD &)::ApplyFunction'
/isdc/sw/root/3.02.07/gcc/2.95.2/include/TMatrixD.h:337: in passing 
argument 1 of `TMatrixD::Apply(TElementActionD &)'
bla.C:12: initialization of non-const reference type `class 
TElementActionD &'
bla.C:12: from rvalue of type `foo(TMatrixD &, TMatrixD &)::ApplyFunction'
/isdc/sw/root/3.02.07/gcc/2.95.2/include/TMatrixD.h:337: in passing 
argument 1 of `TMatrixD::Apply(TElementActionD &)'


Could you hint me a correct way of doing it?

Thanks




-- 
Nicolas Produit
INTEGRAL Science Data Center    Phone:  +41 22 950 91 40
16, Chemin d'Ecogia             Fax:    +41 22 950 91 33
CH-1290 Versoix                 www:    http://isdc.unige.ch/

This archive was generated by hypermail 2b29 : Sat Jan 04 2003 - 23:50:43 MET