Use a named tuple for returning multiple values

>>> v = Gtk.Button().get_alignment()
>>> v
(xalign=0.5, yalign=0.5)
>>> v.xalign
0.5

For each GICallable a new gi._gi.ResultTuple subclass
is created which knows the return value names of that
callable and displays them in __repr__, __dir__ and
allows to access tuple items by name.

The subclass is cached in PyGICallableCache.

To reduce the number of small tuple allocations use a free list
similar to the one used for pure tuples in CPython.

https://bugzilla.gnome.org/show_bug.cgi?id=727374

1 files changed, 34 insertions, 0 deletions

diff --git a/gi/pygi-resulttuple.h b/gi/pygi-resulttuple.h
new file mode 100644
index 00000000..3f63ca0c
--- /dev/null
+++ b/gi/pygi-resulttuple.h
@@ -0,0 +1,34 @@
+/* -*- Mode: C; c-basic-offset: 4 -*-
+ * vim: tabstop=4 shiftwidth=4 expandtab
+ *
+ * Copyright (C) 2015 Christoph Reiter <reiter.christoph@gmail.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __PYGI_RESULTTUPLE_H__
+#define __PYGI_RESULTTUPLE_H__
+
+#include "Python.h"
+
+int
+pygi_resulttuple_register_types    (PyObject *d);
+
+PyTypeObject *
+pygi_resulttuple_new_type          (PyObject *tuple_names);
+
+PyObject*
+pygi_resulttuple_new               (PyTypeObject *subclass, Py_ssize_t len);
+
+#endif /* __PYGI_RESULTTUPLE_H__ */