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#ifdef __cplusplus
/*
SwigPtr_PyObject is used as a replacement of PyObject *, where
the INCREF/DECREF are applied as needed.
You can use SwigPtr_PyObject in a container, such as
std::vector<SwigPtr_PyObject>;
or as a member variable:
struct A {
SwigPtr_PyObject obj;
A(PyObject *o) : _obj(o) {
}
};
or as a input/output value
SwigPtr_PyObject func(SwigPtr_PyObject obj) {
SwigPtr_PyObject out = PyString_FromFormat("hello %s", PyObject_AsString(obj));
Py_DECREF(out);
return out;
}
just remember to pair the object creation with the proper DECREF,
the same as with plain PyObject *ptr, since SwigPtr_PyObject always add
one reference at construction.
SwigPtr_PyObject is 'visible' at the wrapped side, so you can do:
%template(pyvector) std::vector<swig::SwigPtr_PyObject>;
and all the proper typemaps will be used.
*/
namespace swig {
%ignore SwigPtr_PyObject;
struct SwigPtr_PyObject {};
%apply PyObject * {SwigPtr_PyObject};
%apply PyObject * const& {SwigPtr_PyObject const&};
%typemap(typecheck,precedence=SWIG_TYPECHECK_SWIGOBJECT,noblock=1) SwigPtr_PyObject const& "$1 = ($input != 0);";
/* For output */
%typemap(out,noblock=1) SwigPtr_PyObject {
$result = (PyObject *)$1;
Py_INCREF($result);
}
%typemap(out,noblock=1) SwigPtr_PyObject const & {
$result = (PyObject *)*$1;
Py_INCREF($result);
}
}
%{
namespace swig {
class SwigPtr_PyObject {
protected:
PyObject *_obj;
public:
SwigPtr_PyObject() :_obj(0)
{
}
SwigPtr_PyObject(const SwigPtr_PyObject& item) : _obj(item._obj)
{
Py_XINCREF(_obj);
}
SwigPtr_PyObject(PyObject *obj, bool initial_ref = true) :_obj(obj)
{
if (initial_ref) {
Py_XINCREF(_obj);
}
}
SwigPtr_PyObject & operator=(const SwigPtr_PyObject& item)
{
Py_XINCREF(item._obj);
Py_XDECREF(_obj);
_obj = item._obj;
return *this;
}
~SwigPtr_PyObject()
{
Py_XDECREF(_obj);
}
operator PyObject *() const
{
return _obj;
}
PyObject *operator->() const
{
return _obj;
}
};
}
%}
/*
SwigVar_PyObject is used to manage 'in the scope' PyObject * variables,
as in
int func () {
SwigVar_PyObject obj = PyString_FromString("hello");
}
ie, 'obj' is created and destructed in the same scope from
a python object that carries at least one reference value.
SwigVar_PyObject just take care of applying the proper Py_DECREF.
Hence, this class is purely internal and not visible at the wrapped side.
*/
namespace swig {
%ignore SwigVar_PyObject;
struct SwigVar_PyObject {};
%apply PyObject * {SwigVar_PyObject};
%apply PyObject * const& {SwigVar_PyObject const&};
}
%{
namespace swig {
struct SwigVar_PyObject : SwigPtr_PyObject {
SwigVar_PyObject(PyObject* obj = 0) : SwigPtr_PyObject(obj, false) { }
SwigVar_PyObject & operator = (PyObject* obj)
{
Py_XDECREF(_obj);
_obj = obj;
return *this;
}
};
}
%}
#endif
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