[PyGiNaC-users] exvector patch

[Ondrej C. <ond...@gm...>]

I was rejected by a spam filter. Trying again...

Here is the patch for the latter aproach. I modified lst.cpp, maybe
you move it somewhere else.

--- pyginac-orig/src/lst.cpp    2005-03-07 17:38:59.000000000 +0100
+++ pyginac/src/lst.cpp 2005-04-28 17:17:59.945485288 +0200
@@ -62,6 +62,22 @@
     }
 };

+struct exvector_to_python
+{
+    static PyObject* convert( const GiNaC::exvector& obj)
+    {
+        boost::python::list ret;
+        GiNaC::exvector::const_iterator i =3D obj.begin();
+        GiNaC::exvector::const_iterator i_end =3D obj.end();
+        while (i !=3D i_end) {
+             ret.append( boost::python::object(*i));
+             ++i;
+        }
+        Py_INCREF(ret.ptr());
+        return ret.ptr();
+    }
+};
+
 } // !namespace pyginac::(unnamed)

 void
@@ -128,6 +144,8 @@
     to_python_converter<GiNaC::lst, lst_to_python>();
     // TODO: Implement implicit conversions from Python lists of expressio=
ns
     // to GiNaC::lst 's.
+       //
+    to_python_converter<GiNaC::exvector, exvector_to_python>();

 }

On 4/28/05, Ondrej Certik <ond...@gm...> wrote:
> Hello,
> I would like to implement indexed objects, because I need them. But I
> have some problems with boost.python. I would like to use
> basic::get_free_indices, which returns std::vector<ex>,
> so I would like to implicitly convert std::vector<ex> to python list.
> I found vector_wrapper in cctbx:
>
> http://cvs.sourceforge.net/viewcvs.py/*checkout*/cctbx/scitbx/include/sci=
tbx/stl
> /vector_wrapper.h?rev=3D1.4
>
> but unfortunately it uses many headers from cctbx. Maybe it is easier to
> convert it like you do in lst.cpp? I try the latter approach.
>
> O. Certik
>