[gnome-builder/document-manager] util: import glib utils

[Christian Hergert <chergert src gnome org>]

commit 1e5ecf2ea2b6dd902438e4c99d23ab27fe0db231
Author: Christian Hergert <christian hergert me>
Date:   Sun Dec 7 02:40:41 2014 -0800

    util: import glib utils

 src/util/gb-glib.h |   47 +++++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 47 insertions(+), 0 deletions(-)
---
diff --git a/src/util/gb-glib.h b/src/util/gb-glib.h
new file mode 100644
index 0000000..c7f9f36
--- /dev/null
+++ b/src/util/gb-glib.h
@@ -0,0 +1,47 @@
+/* gb-glib.h
+ *
+ * Copyright (C) 2014 Christian Hergert <christian hergert me>
+ *
+ * This file 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 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This file 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 General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef GB_GLIB_H
+#define GB_GLIB_H
+
+#include <glib-object.h>
+
+G_BEGIN_DECLS
+
+#define gb_clear_weak_pointer(ptr) \
+  G_STMT_START { \
+    if (*(gpointer *)(ptr)) \
+      { \
+        g_object_remove_weak_pointer (G_OBJECT (*(GObject**)ptr), \
+                                      (gpointer *)(ptr)); \
+        *(gpointer *)ptr = NULL; \
+      } \
+  } G_STMT_END
+
+#define gb_set_weak_pointer(obj, ptr) \
+  G_STMT_START { \
+    if (obj) \
+      { \
+        *(gpointer *)ptr = obj; \
+        g_object_add_weak_pointer (G_OBJECT (obj), (gpointer *)ptr); \
+      } \
+  } G_STMT_END
+
+G_END_DECLS
+
+#endif /* GB_GLIB_H */