[GiNaC-list] comparing symbols

[Alexei Sheplyakov]

Hi,

On Thu, Jul 24, 2008 at 12:08:23PM -0500, Chris Bouchard wrote:

> The boolean operation "is_a<symbol>(x.op(i));" returns 1 for
> i=0,1 so I think I'm working with a list of symbols, x.
> 
> Additionally, "cout << x;" yields {0,1} 

I don't think this situation is possible (modulo compiler bugs and
things like that).

$ cat test.cc
#include <ginac/ginac.h>
#include <iostream>
using namespace GiNaC;
using namespace std;

int main(int argc, char** argv)
{
        lst x;
        x = ex(0), ex(1);
        if (is_a<symbol>(x.op(0))) {
                cerr << "Huh, 0 is a symbol?" << endl;
                return 1;
        }
        return 0;
}
$ g++ test.cc -lginac
$ ./a.out
$ echo $?
0

Confused,
	Alexei

-- 
All science is either physics or stamp collecting.

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