Re: [GiNaC-list] list input

1 Mar 2015


      On 03/01/2015 05:53 AM, Richard B. Kreckel wrote:
...
On 03/01/2015 11:38 AM, soppon wrote:
...
Hi. I'm trying to use list as input. List as output prints
{expr1,expr2,..}, list.nops() is varying.
When I write list as:
parser reader;
somelist=reader(cin);
where input to cin: {expr1,expr2,..} at the end shift-D
It returns somelist={expr1,expr2,..}, somelist.nops()=1.  When accessing
the 2nd and higher
element of list, program gets segmentation fault.
Please do provide a minimal sample program when reporting bugs. Thanks.
-richard.
#include <iostream>
#include <ginac/ginac.h>
using namespace std;
using namespace GiNaC;
int main()
{
     symbol xs("x");
     lst expr;
     parser reader;
     expr=reader("{x,x}");
     cout <<"list " << expr  << endl;
     cout <<"number of elements "<< expr.nops() << endl;
     cout <<"1st el " <<expr[0] << endl;
     cout <<"2nd el, error " <<expr[1]<< endl;
     return 0;
}