gtk: Move ScopedGObject into ui/base/gtk/scoped_gobject.h

R=erg@chromium.org
TBR=sky@chromium.org

Review URL: https://chromiumcodereview.appspot.com/9594009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@125403 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 35 insertions, 0 deletions

diff --git a/ui/base/gtk/scoped_gobject.h b/ui/base/gtk/scoped_gobject.h
new file mode 100644
index 0000000..5564851
--- /dev/null
+++ b/ui/base/gtk/scoped_gobject.h
@@ -0,0 +1,35 @@
+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef UI_BASE_GTK_SCOPED_GOBJECT_H_
+#define UI_BASE_GTK_SCOPED_GOBJECT_H_
+#pragma once
+
+#include <glib-object.h>
+
+#include "base/memory/scoped_ptr.h"
+
+namespace ui {
+
+// It's not legal C++ to have a templatized typedefs, so we wrap it in a
+// struct.  When using this, you need to include ::Type.  E.g.,
+// ScopedGObject<GdkPixbufLoader>::Type loader(gdk_pixbuf_loader_new());
+template<class T>
+struct ScopedGObject {
+  // A helper class that will g_object_unref |p| when it goes out of scope.
+  // This never adds a ref, it only unrefs.
+  template<class U>
+  struct GObjectUnrefer {
+    void operator()(U* ptr) const {
+      if (ptr)
+        g_object_unref(ptr);
+    }
+  };
+
+  typedef scoped_ptr_malloc<T, GObjectUnrefer<T> > Type;
+};
+
+}  // namespace ui
+
+#endif  // UI_BASE_GTK_SCOPED_GOBJECT_H_