Work around behavior of PyComplex_AsCComplex in Py 2.5.

src/wrapper/_pvt_struct_v2.cpp

@@ -755,7 +755,27 @@ np_complex_float(char *p, PyObject *v, const formatdef *f)
 	else {
 		float re = 0.0f;
 		float im = 0.0f;
-		Py_complex cplx = PyComplex_AsCComplex(v);
+		Py_complex cplx;
+#if (PY_VERSION_HEX < 0x02050000)
+			{
+				if (PyComplex_Check(v))
+					cplx = PyComplex_AsCComplex(v);
+				else if (PyObject_HasAttrString(v, "__complex__"))
+				{
+					PyObject *v2 = PyObject_CallMethod(v, "__complex__", "");
+					cplx = PyComplex_AsCComplex(v2);
+					Py_DECREF(v2);
+				}
+				else
+				{
+					PyErr_SetString(StructError,
+							"required argument is not a complex");
+					return -1;
+				}
+			}
+#else
+			cplx = PyComplex_AsCComplex(v);
+#endif
 		if (PyErr_Occurred()) {
 			PyErr_SetString(StructError,
 					"required argument is not a complex");
@@ -785,7 +805,27 @@ np_complex_double(char *p, PyObject *v, const formatdef *f)
 	else {
 		double re = 0.0;
 		double im = 0.0;
-		Py_complex cplx = PyComplex_AsCComplex(v);
+		Py_complex cplx;
+#if (PY_VERSION_HEX < 0x02050000)
+			{
+				if (PyComplex_Check(v))
+					cplx = PyComplex_AsCComplex(v);
+				else if (PyObject_HasAttrString(v, "__complex__"))
+				{
+					PyObject *v2 = PyObject_CallMethod(v, "__complex__", "");
+					cplx = PyComplex_AsCComplex(v2);
+					Py_DECREF(v2);
+				}
+				else
+				{
+					PyErr_SetString(StructError,
+							"required argument is not a complex");
+					return -1;
+				}
+			}
+#else
+			cplx = PyComplex_AsCComplex(v);
+#endif
 		if (PyErr_Occurred()) {
 			PyErr_SetString(StructError,
 					"required argument is not a complex");